Audi 100/A6 (C4 92-97) FAQ Digest
01-16-2004, 05:10 PM
#22
AudiWorld Super User
Thread Starter
how to access CC memory
Accessing Climate Control ODB
In addition to A/C system On-Board Diagnostic (OBD) using the VAG 1551 Scan Tool, the A/C control head contains a 61-channel OBD display which can be accessed without the use of special tools.
To Access CC OBD readout:
Car ignition on
Press and hold the recirculation button
Press and hold the up arrow button
Release both buttons: "01c" will be displayed ("01c" indicates channel 1, "02c" indicates channel 2, etc.)
To select a different channel, press temperature + or temperature - buttons.
To call up information from a particular channel, select desired channel, and press the recirculation button.
To leave memory display, press the AUTO button, or switch the ignition off.
Diagnostic Channels and their descriptions
1 System malfunction - displayed as a Diagnostic Trouble Code (DTC)
2 Digital value of Interior Temperature Sensor, in Headliner
3 Digital value of Interior Temperature Sensor, in Instrument Panel
4 Digital value of Fresh Air Intake Duct Temperature Sensor
5 Digital value of Outside Air (Ambient) Temperature Sensor, front
6 Digital value of Outside Air (Ambient) Temperature Sensor
7 Digital value of Ambient Temperature Sensor at Fresh Air Blower
8 Digital value of Temperature Regulator Flap Motor Potentiometer
9 Delta value of Temperature Regulator Flap
10 Non-corrected specified value of Temperature Regulator Flap
11 Digital value of Central Flap Motor Potentiometer
12 Specified value of Central Flap
13 Digital value of Footwell/Defroster Flap Motor Potentiometer
14 Specified value of Footwell/Defroster Flap
15 Digital value of Air Flow Flap Motor Potentiometer
16 Specified value of Air Flow Flap
17 Vehicle Speed (km/h)
18 Actual Fresh Air Blower voltage (Volts)
19 Specified Fresh Air Blower voltage (Volts)
20 A/C Compressor (A/C Clutch) voltage (Volts)
21 Number of low voltage occurrences, non-transient
22 Cycle condition of A/C Refrigerant High Pressure Switch
23 Cyclings of the A/C Refrigerant High Pressure Switch
24 Cyclings of the switches, absolute non-fluctuating
25 Analog/Digital value, Kick-Down Switch
26 Analog/Digital value, Engine Coolant Temperature (ECT) Warning Light
27 Coding value
28 Engine Speed (RPM)
29 A/C Compressor speed in rpm (Equals Engine Speed x 1.28)
30 Software version
31 Display check (all segments of A/C Control Head display light up)
32 Potentiometer malfunction counter, Temperature Regulator Flap
33 Potentiometer malfunction counter, Central Flap
34 Potentiometer malfunction counter, Footwell/Defroster Flap
35 Potentiometer malfunction counter, Air Flow Flap
36 Feedback value, cold end-stop, Temperature Regulator Flap Motor Potentiometer
37 Feedback value, hot end-stop, Temperature Regulator Flap Motor Potentiometer
38 Feedback value, cold end-stop, Central Flap Motor Potentiometer
39 Feedback value, hot end-stop, Central Flap Motor Potentiometer
40 Feedback value, cold end-stop, Footwell/Defroster Flap Motor Potentiometer
41 Feedback value, hot end-stop, Footwell/Defroster Flap Motor Potentiometer
42 Feedback value, cold end-stop, Air Flow Flap Motor Potentiometer
43 Feedback value, hot end-stop, Air Flow Flap Motor Potentiometer
44 Vehicle operation cycle counter
45 Calculated Interior temperature (internal software, in digits)
46 Outside (ambient) temperature, filtered, for regulation (internal software)
47 Outside (ambient) temperature, unfiltered, (internal software, in Celsius)
48 Outside (ambient) temperature, unfiltered (in digits)
49 Malfunction counter for speedometer (vehicle speed) signal
50 Standing time (in minutes)
51 Engine Coolant Temperature (ECT), in Celsius
52 Graphics channel 1 = 88.8, see chart, NOTE: When Diagnostic Channel 52
is selected, "--.-" is displayed first. A/C compressor switch-off conditions
are identified by illuminated segments of the "88.8" display.
53 Graphics channel 2 = 88.8, see chart, NOTE: When Diagnostic Channel 53
is selected, "--.-" is displayed first. A/C system electrical outputs are
identified by illuminated segments of the "88.8" display.
54 Control characteristics
55 Outside (ambient) temperature, in Celsius or Fahrenheit depending on the setting
of the A/C control head
56 Temperature in Celsius, from Interior Temperature Sensor, in Headliner
57 Temperature in Celsius, from Interior Temperature Sensor, in Instrument Panel
58 Temperature in Celsius, from Fresh Air Intake Duct Temperature Sensor
59 Temperature in Celsius, from Outside Air (Ambient) Temperature Sensor
60 Temperature in Celsius, from Ambient Temperature Sensor at Fresh Air Blower
61 Software version (latest)
In addition to A/C system On-Board Diagnostic (OBD) using the VAG 1551 Scan Tool, the A/C control head contains a 61-channel OBD display which can be accessed without the use of special tools.
To Access CC OBD readout:
Car ignition on
Press and hold the recirculation button
Press and hold the up arrow button
Release both buttons: "01c" will be displayed ("01c" indicates channel 1, "02c" indicates channel 2, etc.)
To select a different channel, press temperature + or temperature - buttons.
To call up information from a particular channel, select desired channel, and press the recirculation button.
To leave memory display, press the AUTO button, or switch the ignition off.
Diagnostic Channels and their descriptions
1 System malfunction - displayed as a Diagnostic Trouble Code (DTC)
2 Digital value of Interior Temperature Sensor, in Headliner
3 Digital value of Interior Temperature Sensor, in Instrument Panel
4 Digital value of Fresh Air Intake Duct Temperature Sensor
5 Digital value of Outside Air (Ambient) Temperature Sensor, front
6 Digital value of Outside Air (Ambient) Temperature Sensor
7 Digital value of Ambient Temperature Sensor at Fresh Air Blower
8 Digital value of Temperature Regulator Flap Motor Potentiometer
9 Delta value of Temperature Regulator Flap
10 Non-corrected specified value of Temperature Regulator Flap
11 Digital value of Central Flap Motor Potentiometer
12 Specified value of Central Flap
13 Digital value of Footwell/Defroster Flap Motor Potentiometer
14 Specified value of Footwell/Defroster Flap
15 Digital value of Air Flow Flap Motor Potentiometer
16 Specified value of Air Flow Flap
17 Vehicle Speed (km/h)
18 Actual Fresh Air Blower voltage (Volts)
19 Specified Fresh Air Blower voltage (Volts)
20 A/C Compressor (A/C Clutch) voltage (Volts)
21 Number of low voltage occurrences, non-transient
22 Cycle condition of A/C Refrigerant High Pressure Switch
23 Cyclings of the A/C Refrigerant High Pressure Switch
24 Cyclings of the switches, absolute non-fluctuating
25 Analog/Digital value, Kick-Down Switch
26 Analog/Digital value, Engine Coolant Temperature (ECT) Warning Light
27 Coding value
28 Engine Speed (RPM)
29 A/C Compressor speed in rpm (Equals Engine Speed x 1.28)
30 Software version
31 Display check (all segments of A/C Control Head display light up)
32 Potentiometer malfunction counter, Temperature Regulator Flap
33 Potentiometer malfunction counter, Central Flap
34 Potentiometer malfunction counter, Footwell/Defroster Flap
35 Potentiometer malfunction counter, Air Flow Flap
36 Feedback value, cold end-stop, Temperature Regulator Flap Motor Potentiometer
37 Feedback value, hot end-stop, Temperature Regulator Flap Motor Potentiometer
38 Feedback value, cold end-stop, Central Flap Motor Potentiometer
39 Feedback value, hot end-stop, Central Flap Motor Potentiometer
40 Feedback value, cold end-stop, Footwell/Defroster Flap Motor Potentiometer
41 Feedback value, hot end-stop, Footwell/Defroster Flap Motor Potentiometer
42 Feedback value, cold end-stop, Air Flow Flap Motor Potentiometer
43 Feedback value, hot end-stop, Air Flow Flap Motor Potentiometer
44 Vehicle operation cycle counter
45 Calculated Interior temperature (internal software, in digits)
46 Outside (ambient) temperature, filtered, for regulation (internal software)
47 Outside (ambient) temperature, unfiltered, (internal software, in Celsius)
48 Outside (ambient) temperature, unfiltered (in digits)
49 Malfunction counter for speedometer (vehicle speed) signal
50 Standing time (in minutes)
51 Engine Coolant Temperature (ECT), in Celsius
52 Graphics channel 1 = 88.8, see chart, NOTE: When Diagnostic Channel 52
is selected, "--.-" is displayed first. A/C compressor switch-off conditions
are identified by illuminated segments of the "88.8" display.
53 Graphics channel 2 = 88.8, see chart, NOTE: When Diagnostic Channel 53
is selected, "--.-" is displayed first. A/C system electrical outputs are
identified by illuminated segments of the "88.8" display.
54 Control characteristics
55 Outside (ambient) temperature, in Celsius or Fahrenheit depending on the setting
of the A/C control head
56 Temperature in Celsius, from Interior Temperature Sensor, in Headliner
57 Temperature in Celsius, from Interior Temperature Sensor, in Instrument Panel
58 Temperature in Celsius, from Fresh Air Intake Duct Temperature Sensor
59 Temperature in Celsius, from Outside Air (Ambient) Temperature Sensor
60 Temperature in Celsius, from Ambient Temperature Sensor at Fresh Air Blower
61 Software version (latest)
01-16-2004, 05:11 PM
#23
AudiWorld Super User
Thread Starter
CC Diagnostic Trouble Codes
Diagnostic Trouble Codes
DTC Malfunction
--------------------------------------------------------------------------------
0.00 No Malfunction Present
--------------------------------------------------------------------------------
02.1 (G86) Interior Temperature Sensor, in Headliner, static open (*02.1)
02.2 Interior Temperature Sensor, in Headliner, static short, see 02.1
02.3 Interior Temperature Sensor, in Headliner, sporadic open
02.4 Interior Temperature Sensor, in Headliner, sporadic short
--------------------------------------------------------------------------------
03.1 (G56) Interior Temperature Sensor, in Instrument Panel, static open, see 02.1
03.2 Interior Temperature Sensor, in Instrument Panel, static short, see 02.1
03.3 Interior Temperature Sensor, in Instrument Panel, sporadic open
03.4 Interior Temperature Sensor, in Instrument Panel, sporadic short
--------------------------------------------------------------------------------
04.1 (G89) Fresh Air Intake Duct Temperature Sensor, static open (*04.1)
04.2 Fresh Air Intake Duct Temperature Sensor, static short, see 04.1
04.3 Fresh Air Intake Duct Temperature Sensor, sporadic open
04.4 Fresh Air Intake Duct Temperature Sensor, sporadic short
--------------------------------------------------------------------------------
05.1 (G17) Outside Air (Ambient) Temperature Sensor, front, static open (*05.1)
05.2 Outside Air (Ambient) Temperature Sensor, front, static short, see 05.1 (*05.2)
05.3 Outside Air (Ambient) Temperature Sensor, front, sporadic open
05.4 Outside Air (Ambient) Temperature Sensor, front, sporadic short
--------------------------------------------------------------------------------
06.1 (G110) Engine Coolant Temperature (ECT), A/C static open (*06.1)
06.2 Engine Coolant Temperature (ECT), A/C static short, see 06.1
06.3 Engine Coolant Temperature (ECT), A/C sporadic open
06.4 Engine Coolant Temperature (ECT), A/C sporadic short
--------------------------------------------------------------------------------
07.1 (G109) Ambient Temperature Sensor at Fresh Air Blower, static open (*07.1)
07.2 Ambient Temperature Sensor at Fresh Air Blower, static short, see 07.1
07.3 Ambient Temperature Sensorat Fresh Air Blower, sporadic open
07.4 Ambient Temperature Sensor at Fresh Air Blower, sporadic short
--------------------------------------------------------------------------------
08.1 (G92) Temperature Regulator Flap Motor Potentiometer, static open (*08.1)
08.2 Temperature Regulator Flap Motor Potentiometer, static short, see 08.1
08.3 Temperature Regulator Flap Motor Potentiometer, sporadic open
08.4 Temperature Regulator Flap Motor Potentiometer, sporadic short
08.5 Temperature Regulator Flap, static block (*08.5)
08.6 Temperature Regulator Flap Motor Potentiometer, malfunction
08.7 Temperature Regulator Flap, sporadic block
--------------------------------------------------------------------------------
11.1 (G112) Central Flap Motor Potentiometer, static open (*11.1)
11.2 Central Flap Motor Potentiometer, static short, see 11.1
11.3 Central Flap Motor Potentiomenter, sporadic open
11.4 Central Flap Motor Potentiometer, sporadic short
11.5 Central Flap, static block (*11.5)
11.6 Central Flap Motor Potentiometer, malfunction
11.7 Central Flap, sporadic block
--------------------------------------------------------------------------------
13.1 (G114) Footwell/Defroster Flap Motor Potentiometer, static open (*13.1)
13.2 Footwell/Defroster Flap Motor Potentiometer, static short, see 13.1
13.3 Footwell/Defroster Flap Motor Potentiometer, sporadic open
13.4 Footwell/Defroster Flap Motor Potentiometer, sporadic short
13.5 Footwell/Defroster Flap, static block (*13.5)
13.6 Footwell/Defroster Flap Motor Potentiometer, malfunction
13.7 Footwell/Defroster Flap, sporadic block
--------------------------------------------------------------------------------
15.1 (G113) Air Flow Flap Motor Potentiometer, static open (*15.1)
15.2 Air Flow Flap Motor Potentiometer, static short, see 15.1
15.3 Air Flow Flap Motor Potentiometer, sporadic open
15.4 Air Flow Flap Motor Potentiometer, sporadic short
15.5 Air Flow Flap, static block, see (*15.5)
15.6 Air Flow Flap Motor Potentiometer, malfunction
15.7 Air Flow Flap, sporadic block
--------------------------------------------------------------------------------
17.0 Vehicle Speed Signal faulty
--------------------------------------------------------------------------------
18.1 Fresh Air Blower voltage, static
18.3 Fresh Air Blower voltage, sporadic
--------------------------------------------------------------------------------
20.1 A/C compressor voltage not OK - static (*20.1)
20.3 A/C compressor voltage not OK - sporadic
--------------------------------------------------------------------------------
22.1 (F118) A/C Refrigerant High Pressure Switch, static open (*22.1)
22.3 A/C Refrigerant High Pressure Switch, sporadic open
22.5 A/C Refrigerant High Pressure Switch, 120X open (*22.5)
--------------------------------------------------------------------------------
29.1 Belt slip detection "soft," static
29.2 Belt slip detection "hard," static
29.3 Belt slip detection "soft," sporadic
29.4 Belt slip detection "hard," sporadic
--------------------------------------------------------------------------------
Remarks
*02.1 Digital default value of 128 is programmed if sensor fails
*04.1 Value supplied by Temperature Sensor is used if sensor fails
*05.1 Value supplied by Temperature Sensor is used if sensor fails
*05.2 Digital default value of 128 is programmed if sensors G89 and G17 both fail
*06.1 Engine Coolant Temperature is calculated if sensor should fail or is not
installed; diagnosis occurs only above 0oC
*07.1 Programmed corrective value = 0
*08.1 Temperature Regulator Flap Motor will no longer be controlled
automatically; manual adjustment only
*08.5 Motor is cycled, software attempts to eliminate block
*11.1 Central Flap Motor will no longer be controlled automatically; manual
adjustment only
*11.5 Motor is cycled; software attempts to eliminate block
*13.1 Footwell/Defroster Flap Motor will no longer be controlled automatically;
manual adjustment only
*13.5 Motor is cycled; software attempts to eliminate block
*15.1 Digital value is internally programmed for limp-home mode
*15.5 Motor is cycled; software attempts to eliminate block
*20.1 Compressor remains off until voltage is greater than 10.8V for at least 25 seconds
*22.1 Compressor remains off until switch closes
*22.5 Compressor re-engagement circuit, VAG 1551 Scan Tool function
Diagnostic Channel 52 - Graphics Channel 1
A/C Compressor switch-off conditions
Note: if an A/C compressor switch-off condition exists, a segment of the "88.8" display, noted below as an alpha-numeric code, will illuminate.
Segment Condition
A1 Slippage or blockage, A/C Refrigerant High Pressure Switch, 120x off
B1 Engine Speed (RPM) less than 200 - 500
C1 Engine Speed (RPM) greater than 6000
D1 Engine Speed (RPM) greater than 6000
E1 System function OK*
F1 System function OK*
G1 System function OK*
A2 A/C manually switched off (A/C standby canceled)
B2 Low Voltage
C2 Kick-down switch (via Transmission Control Module (TCM), compressor off for 12 seconds max.
E2 A/C Refrigerant Low Pressure Switch (F73)
F2 A/C Refrigerant High Pressure Switch (F118)
G2 System function OK*
A3 ECON mode selected
B3 OFF selected
C3 Outside (ambient) temperature too low
D3 Engine management system (compressor will remain off for 3 -12 seconds)
E3 High pressure occurrences more than 30 times
F3 Ambient Temperature Sensor at Fresh Air Blower (G109) less than 27 degF (-3oC)
G3 System function OK*
Decimal Point Visible: A/C compressor ON
Not Visible: A/C compressor OFF
*segments g1, g2, and g3 must illuminate simultaneously to indicate system function is OK.
Diagnostic Channel 53 - Graphics Channel 2
Active electrical outputs
Note: When a NO system electrical output is activated, a segment of the "88.8" display, noted below as an alpha-numeric code, will illuminate. The decimal point in the "88.8" display will not illuminate in this channel.
Segment Condition
A1 Fan for interior temperature sensor
B1 Fresh air/recirculation flap closed (recirculation mode)
C1 Heater valve closed
D1 Bi-directional wiring harness
E1 A/C compressor ON
F1 coolant fan first speed ON
G1 System function OK*
A2 Air flow flap open
B2 Air flow flap open
C2 Air flow flap closed
D2 Footwell/Defroster flap in "Footwell" position
E2 Footwell/Defroster flap in "Footwell" position
F2 Footwell/Defroster flap in "Defroster" position
G2 System function OK*
A3 Central flap in "instrument panel outlet" position
B3 Central flap in "instrument panel outlet" position
C3 Central flap in "footwell outlet/defrost" position
D3 Temperature flap in "cold air" position
E3 Temperature flap in "cold air" position
F3 Temperature flap in "warm air" position
G3 System function OK*
* Segments g1, g2, and g3 must illuminate simultaneously to indicate system function is OK
DTC Malfunction
--------------------------------------------------------------------------------
0.00 No Malfunction Present
--------------------------------------------------------------------------------
02.1 (G86) Interior Temperature Sensor, in Headliner, static open (*02.1)
02.2 Interior Temperature Sensor, in Headliner, static short, see 02.1
02.3 Interior Temperature Sensor, in Headliner, sporadic open
02.4 Interior Temperature Sensor, in Headliner, sporadic short
--------------------------------------------------------------------------------
03.1 (G56) Interior Temperature Sensor, in Instrument Panel, static open, see 02.1
03.2 Interior Temperature Sensor, in Instrument Panel, static short, see 02.1
03.3 Interior Temperature Sensor, in Instrument Panel, sporadic open
03.4 Interior Temperature Sensor, in Instrument Panel, sporadic short
--------------------------------------------------------------------------------
04.1 (G89) Fresh Air Intake Duct Temperature Sensor, static open (*04.1)
04.2 Fresh Air Intake Duct Temperature Sensor, static short, see 04.1
04.3 Fresh Air Intake Duct Temperature Sensor, sporadic open
04.4 Fresh Air Intake Duct Temperature Sensor, sporadic short
--------------------------------------------------------------------------------
05.1 (G17) Outside Air (Ambient) Temperature Sensor, front, static open (*05.1)
05.2 Outside Air (Ambient) Temperature Sensor, front, static short, see 05.1 (*05.2)
05.3 Outside Air (Ambient) Temperature Sensor, front, sporadic open
05.4 Outside Air (Ambient) Temperature Sensor, front, sporadic short
--------------------------------------------------------------------------------
06.1 (G110) Engine Coolant Temperature (ECT), A/C static open (*06.1)
06.2 Engine Coolant Temperature (ECT), A/C static short, see 06.1
06.3 Engine Coolant Temperature (ECT), A/C sporadic open
06.4 Engine Coolant Temperature (ECT), A/C sporadic short
--------------------------------------------------------------------------------
07.1 (G109) Ambient Temperature Sensor at Fresh Air Blower, static open (*07.1)
07.2 Ambient Temperature Sensor at Fresh Air Blower, static short, see 07.1
07.3 Ambient Temperature Sensorat Fresh Air Blower, sporadic open
07.4 Ambient Temperature Sensor at Fresh Air Blower, sporadic short
--------------------------------------------------------------------------------
08.1 (G92) Temperature Regulator Flap Motor Potentiometer, static open (*08.1)
08.2 Temperature Regulator Flap Motor Potentiometer, static short, see 08.1
08.3 Temperature Regulator Flap Motor Potentiometer, sporadic open
08.4 Temperature Regulator Flap Motor Potentiometer, sporadic short
08.5 Temperature Regulator Flap, static block (*08.5)
08.6 Temperature Regulator Flap Motor Potentiometer, malfunction
08.7 Temperature Regulator Flap, sporadic block
--------------------------------------------------------------------------------
11.1 (G112) Central Flap Motor Potentiometer, static open (*11.1)
11.2 Central Flap Motor Potentiometer, static short, see 11.1
11.3 Central Flap Motor Potentiomenter, sporadic open
11.4 Central Flap Motor Potentiometer, sporadic short
11.5 Central Flap, static block (*11.5)
11.6 Central Flap Motor Potentiometer, malfunction
11.7 Central Flap, sporadic block
--------------------------------------------------------------------------------
13.1 (G114) Footwell/Defroster Flap Motor Potentiometer, static open (*13.1)
13.2 Footwell/Defroster Flap Motor Potentiometer, static short, see 13.1
13.3 Footwell/Defroster Flap Motor Potentiometer, sporadic open
13.4 Footwell/Defroster Flap Motor Potentiometer, sporadic short
13.5 Footwell/Defroster Flap, static block (*13.5)
13.6 Footwell/Defroster Flap Motor Potentiometer, malfunction
13.7 Footwell/Defroster Flap, sporadic block
--------------------------------------------------------------------------------
15.1 (G113) Air Flow Flap Motor Potentiometer, static open (*15.1)
15.2 Air Flow Flap Motor Potentiometer, static short, see 15.1
15.3 Air Flow Flap Motor Potentiometer, sporadic open
15.4 Air Flow Flap Motor Potentiometer, sporadic short
15.5 Air Flow Flap, static block, see (*15.5)
15.6 Air Flow Flap Motor Potentiometer, malfunction
15.7 Air Flow Flap, sporadic block
--------------------------------------------------------------------------------
17.0 Vehicle Speed Signal faulty
--------------------------------------------------------------------------------
18.1 Fresh Air Blower voltage, static
18.3 Fresh Air Blower voltage, sporadic
--------------------------------------------------------------------------------
20.1 A/C compressor voltage not OK - static (*20.1)
20.3 A/C compressor voltage not OK - sporadic
--------------------------------------------------------------------------------
22.1 (F118) A/C Refrigerant High Pressure Switch, static open (*22.1)
22.3 A/C Refrigerant High Pressure Switch, sporadic open
22.5 A/C Refrigerant High Pressure Switch, 120X open (*22.5)
--------------------------------------------------------------------------------
29.1 Belt slip detection "soft," static
29.2 Belt slip detection "hard," static
29.3 Belt slip detection "soft," sporadic
29.4 Belt slip detection "hard," sporadic
--------------------------------------------------------------------------------
Remarks
*02.1 Digital default value of 128 is programmed if sensor fails
*04.1 Value supplied by Temperature Sensor is used if sensor fails
*05.1 Value supplied by Temperature Sensor is used if sensor fails
*05.2 Digital default value of 128 is programmed if sensors G89 and G17 both fail
*06.1 Engine Coolant Temperature is calculated if sensor should fail or is not
installed; diagnosis occurs only above 0oC
*07.1 Programmed corrective value = 0
*08.1 Temperature Regulator Flap Motor will no longer be controlled
automatically; manual adjustment only
*08.5 Motor is cycled, software attempts to eliminate block
*11.1 Central Flap Motor will no longer be controlled automatically; manual
adjustment only
*11.5 Motor is cycled; software attempts to eliminate block
*13.1 Footwell/Defroster Flap Motor will no longer be controlled automatically;
manual adjustment only
*13.5 Motor is cycled; software attempts to eliminate block
*15.1 Digital value is internally programmed for limp-home mode
*15.5 Motor is cycled; software attempts to eliminate block
*20.1 Compressor remains off until voltage is greater than 10.8V for at least 25 seconds
*22.1 Compressor remains off until switch closes
*22.5 Compressor re-engagement circuit, VAG 1551 Scan Tool function
Diagnostic Channel 52 - Graphics Channel 1
A/C Compressor switch-off conditions
Note: if an A/C compressor switch-off condition exists, a segment of the "88.8" display, noted below as an alpha-numeric code, will illuminate.
Segment Condition
A1 Slippage or blockage, A/C Refrigerant High Pressure Switch, 120x off
B1 Engine Speed (RPM) less than 200 - 500
C1 Engine Speed (RPM) greater than 6000
D1 Engine Speed (RPM) greater than 6000
E1 System function OK*
F1 System function OK*
G1 System function OK*
A2 A/C manually switched off (A/C standby canceled)
B2 Low Voltage
C2 Kick-down switch (via Transmission Control Module (TCM), compressor off for 12 seconds max.
E2 A/C Refrigerant Low Pressure Switch (F73)
F2 A/C Refrigerant High Pressure Switch (F118)
G2 System function OK*
A3 ECON mode selected
B3 OFF selected
C3 Outside (ambient) temperature too low
D3 Engine management system (compressor will remain off for 3 -12 seconds)
E3 High pressure occurrences more than 30 times
F3 Ambient Temperature Sensor at Fresh Air Blower (G109) less than 27 degF (-3oC)
G3 System function OK*
Decimal Point Visible: A/C compressor ON
Not Visible: A/C compressor OFF
*segments g1, g2, and g3 must illuminate simultaneously to indicate system function is OK.
Diagnostic Channel 53 - Graphics Channel 2
Active electrical outputs
Note: When a NO system electrical output is activated, a segment of the "88.8" display, noted below as an alpha-numeric code, will illuminate. The decimal point in the "88.8" display will not illuminate in this channel.
Segment Condition
A1 Fan for interior temperature sensor
B1 Fresh air/recirculation flap closed (recirculation mode)
C1 Heater valve closed
D1 Bi-directional wiring harness
E1 A/C compressor ON
F1 coolant fan first speed ON
G1 System function OK*
A2 Air flow flap open
B2 Air flow flap open
C2 Air flow flap closed
D2 Footwell/Defroster flap in "Footwell" position
E2 Footwell/Defroster flap in "Footwell" position
F2 Footwell/Defroster flap in "Defroster" position
G2 System function OK*
A3 Central flap in "instrument panel outlet" position
B3 Central flap in "instrument panel outlet" position
C3 Central flap in "footwell outlet/defrost" position
D3 Temperature flap in "cold air" position
E3 Temperature flap in "cold air" position
F3 Temperature flap in "warm air" position
G3 System function OK*
* Segments g1, g2, and g3 must illuminate simultaneously to indicate system function is OK
01-16-2004, 05:14 PM
#24
AudiWorld Super User
Thread Starter
Dumping trouble codes
Dumping Diagnostic Trouble Codes (DTC's)
Audi's with On Board Diagnostics (OBD) can store trouble codes (DTC's) if the computer thinks anything is wrong with the car.
Procedure for dumping DTC's:
Note: This procedure assumes that you have an Malfunction Indicator Lamp and that it is operational. If not, use the test-light method.
Note: This procedure is for the '93-'95 80/90 series with the 2.8l engine. For 100/A6 cars, the connectors are reversed. For 2.6l cars, this procedure probably doesn't work; try it at your own risk. If you figure out how it works, Tell me how! If you're not sure, don't try it.
Step 1: Getting ready.
First, make sure that your Malfunction Indicator Lamp (MIL) is working. To do this, turn the ignition switch ON, and observe the dash lights. You should see something like the picture on the left. The MIL is the orange one that says "CHECK" and has a picture of an engine on it. If you don't see this lamp, use the test-light method. Picture coming soon!
Next, find the connectors you will need to use. These connectors are in the fuse box, which is under the hood right behind the firewall on the driver's side. Open the fusebox, and look for the two connectors on the left-hand side of the box (viewed from the front of the car). You'll want to connect the right-hand pin of the connector closest to you with the right-hand pin of the connector behind it.
Step 2: Getting the codes.
You should try to view the DTC codes with the engine running. If the engine will not start or keep running, use the "Engine does not run" procedure.
Start the engine and let it idle.
With the engine running, connect the two pins (on the connectors you identified in step 1) for at least 4 seconds.
Disconnect the two pins.
Count and record codes as they are displayed on the MIL:
Each code is comprised of 4 groups of flashes with a maximum of 4 flashes per group.
Between each group (one code) there is a pause of about 2.5 seconds before the next code starts to flash.
After all codes are displayed, the code 0000 (end of output) will display. The 0000 code is four 2.5 second flashes at 2.5 second intervals.
If no codes are present, code 4444 will display.
Refer to the chart of blink codes for an explanation of your codes.
To clear the codes, connect the other left-hand pins of the two connectors for at least 4 seconds.
Step 2: Getting the codes (if engine does not run).
1: Crank the engine for 5 to 6 seconds, then leave the ignition switch turned ON after cranking.
CAUTION: Do not crank the engine for longer than 15 seconds! Allow one minute between crank attempts for the starter motor to cool down.
2: Connect the two pins (on the connectors you identified in step 1) for at least 4 seconds.
3: Disconnect the two pins.
4: Count and record codes as they are displayed on the MIL:
5: Each code is comprised of 4 groups of flashes with a maximum of 4 flashes per group.
6: Between each group (one code) there is a pause of about 2.5 seconds before the next code starts to flash.
Note: One of the codes you will get will be code 2111. This code (engine speed sensor) is always displayed when the ignition switch is ON and the engine is not running. This fault display is normal and can be ignored when the engine is not running.
7: Repeat steps 2 and 3, because only one code will be displayed each time.
8: Continue repeating steps 2 and 3 until code 0000 (end of output) is displayed. The 0000 code is four 2.5 second flashes at 2.5 second intervals.
Refer to the chart of blink codes for an explanation of your codes.
To clear the codes, connect the other left-hand pins of the two connectors for at least 4 seconds.
Diagnostic Trouble Codes
--------------------------------------------------------------------------------
4444
No DTC recognized.
--------------------------------------------------------------------------------
0000
Display ends.
--------------------------------------------------------------------------------
1111
Control Module Malfunctioning. This malfunction type is registered when malfunctions are recognized in the ROM, RAM, or EEPROM of the ECU. Possible Cause Possible
Effects Corrective Steps
Ground connections to ECM: J192 connector D terminals 1,2,3, and 16 Engine does not start Check GND connections
ECM faulty Engine does not start Repair/Replace ECM
--------------------------------------------------------------------------------
1231
Vehicle Speed Sensor G68 Possible Cause Possible
Effects Corrective Steps
Vehicle speed sensor (VSS) faulty Vehicle dies while decelerating
Load change jolt
Replace VSS
Wiring connection between VSS and speedometer faulty Vehicle dies while decelerating
Load change jolt
Check wiring connections between VSS and instrument cluster
Wiring connection between instrument cluster and ECM faulty Vehicle dies while decelerating
Load change jolt
Check wiring connections between instrument cluster and ECM
ECM Faulty Vehicle dies while decelerating
Load change jolt
Repair or replace ECM
--------------------------------------------------------------------------------
2111
Engine speed sensor G28. Related symptoms could be lack of ignition of fuel injection while cranking. Possible Cause Possible
Effects Corrective Steps
Debris on engine speed (RPM) sensor G28 Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Sensor G28 socket loose Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Distance from G28 to flywheel ring gear greater than 1.2mm (3/64 in) Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Broken teeth on flywheel ring gear Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Open circuit between ECM connector J192 and G28 Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Short circuit between connector C terminals 1,2, and 3 and J192 and/or shielding or ground Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Open circuit in G28 shielding Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Open circuit between 3-pin connector in engine compartment and G28 Engine does not start
Ignition misfires
Engine dies
Repair short or open circuit
3-pin connector from G28 and connector G4 reversed Engine does not start Connect G4(Crankshaft position sensor) and G28 connector properly
Sensor G28 faulty Engine does not start Connect G4(Crankshaft position sensor) and engine speed (RPM) sensor connector properly
Input for G28 in J192 (ECM) faulty Engine does not start Connect G4(Crankshaft position sensor) and G28 sensors properly
--------------------------------------------------------------------------------
2112
Crankshaft position sensor: G4. Possible Cause Possible
Effects Corrective Steps
Crankshaft Position sensor G4 loose Malfunction occurs before engine start; engine does not start Check crankshaft position sensor G4
Distance from G4 to crankshaft counterweight greater than 1.3mm (0.051in) Malfunction occurs before engine start; engine does not start Check crankshaft position sensor G4
Open circuit in wiring between 3-pin connector in engine compartment and G4 Malfunction occurs after engine started Repair open circuit in wiring connector
Short circuit between connector C terminals 4,5, and 6 and ECM J192 and/or shielding and/or ground Malfunction occurs after engine started Repair or replace ECM connector J192 (ECM)
Repair short circuit in wiring
Open circuit in wiring in G4 shielding Malfunction occurs after engine started Repair open circuit in G4 shielding
Input for G4 in J192 (ECM) faulty Malfunction occurs after engine started Repair or replace connector J192 (ECM)
3-pin plug connector of G4 and G28(RPM sensor) reversed in engine compartment Engine does not start Connect 3-pin connectors of G4 and G28 correctly
--------------------------------------------------------------------------------
2113
Camshaft position sensor: G40. Possible Cause Possible
Effects Corrective Steps
Supply voltage for camshaft position sensor G40 from J192 (ECM) Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Check camshaft position sensor G40
Repair circuit wiring
Open circuit in signal wire to J192 (ECM) and/or short to ground of signal wire in connector C terminals 7,8, and 9 Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Repair short or open circuit in wiring
Open circuit between 3-pin connector in engine compartment and J192 (ECM) Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Repair short or open circuit in wiring
Assignment of groove on crankshaft counterweight (Sensor G4 also shows error) Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Check Camshaft position sensor G40
Sensor G40 faulty Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Repair or replace sensor G40
Input for G4 in J192 (ECM) faulty Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Repair wiring in connector
Cam timing off Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Check cam timing
--------------------------------------------------------------------------------
2121
Closed Throttle Position Switch: F60 Possible Cause Corrective Steps
Throttle valve sticking Clean/adjust throttle valve
Adjust accelerator pedal cable
Floor mat presses on accelerator pedal Re-position floor mat using orange posts
Accelerator pedal cable out of adjustment Adjust accelerator pedal cable
Open circuit in wiring to connector A, terminal 9 of J192 (ECM) Repair open/short circuit in wiring
Input F60 in J192 (ECM) faulty Repair wiring in connector
Connector A terminal 9 of J192 (ECM) has short circuit to ground Repair open/short circuit in wiring
Moisture in throttle connector Clean and dry throttle connector
--------------------------------------------------------------------------------
2141
Knock sensor controls, Cyl.'s 1, 2, or 3 (must use VAG1551 to determine which Cyl) Possible Cause Possible
Effects Corrective Steps
Knock regulation module in ECM (J192) faulty High fuel consumption
Loss of power
Engine runs rough
Max. speed is not reached
Repair/replace J192 (ECM)
Poor fuel quality, octane lower than 95 RON High fuel consumption
Loss of power
Engine runs rough
Max. speed is not reached
Fill tank with fuel having octane of at least 95 RON
Abnormal engine noise (attached component loose) High fuel consumption
Loss of power
Engine runs rough
Max. speed is not reached
Tighten knock sensor and whatever is loose
Open circuit in wiring in knock sensor G61 shielding High fuel consumption
Loss of power
Engine runs rough
Max. speed is not reached
Repair open circuit in wiring
Knock sensor loose High fuel consumption
Loss of power
Engine runs rough
Max. speed is not reached
Tighten knock sensor
--------------------------------------------------------------------------------
2142
Knock sensor 1: G61. Ignition timing may be retarded by 12o when this code is stored. Possible Cause Possible
Effects Corrective Steps
Knock sensor 1 loose or connector corroded High fuel consumption
Lack of power
Jerky, loss of power (like misfiring)
Tightening torque: 20Nm (15 ft lb)
Repair open or short circuit in wiring
Open circuit or short circuit in wiring between G61 and J192 (ECM) High fuel consumption
Lack of power
Jerky, loss of power (like misfiring)
Repair open or short circuit in wiring
Short circuit between G61 and ground or to shielding High fuel consumption
Lack of power
Jerky, loss of power (like misfiring)
Repair open or short circuit in wiring
G61 Faulty High fuel consumption
Lack of power
Jerky, loss of power (like misfiring)
Replace Knock Sensor 1: G61
Input for G61 in J192 (ECM) faulty High fuel consumption
Lack of power
Jerky, loss of power (like misfiring)
Repair or replace J192 (ECM)
--------------------------------------------------------------------------------
2143
Knock Sensor Control, Cyl.'s 4, 5, 6 Possible Cause Possible
Effects Corrective Steps
Knock regulation module in J192 (ECM) High fuel consumption
Loss of power
Engine runs rough
Max. Speed is not reached
Repair/Replace J192 (ECM)
Poor fuel quality, octane lower than 95 RON High fuel consumption
Loss of power
Engine runs rough
Max. Speed is not reached
Fill tank with fuel having an octane of at least 95 RON
Abnormal engine noise (attached component loose) High fuel consumption
Loss of power
Engine runs rough
Max. Speed is not reached
Tighten knock sensor to 20Nm (15 ft lb), tighten whatever is loose
Open circuit in wiring Knock Sensor 2 (G66) shielding High fuel consumption
Loss of power
Engine runs rough
Max. Speed is not reached
Repair open circuit in wiring
Knock Sensor 2 loose High fuel consumption
Loss of power
Engine runs rough
Max. Speed is not reached
Tighten knock sensor 2 to 20Nm (15 ft lb)
--------------------------------------------------------------------------------
2144
Knock Sensor 2: G66. When this error occurs, the ignition timing may be retarded by 12o (crankshaft) in the knocking areas of the ignition map. Possible Cause Possible
Effects Corrective Steps
Knock sensor 2 G66 loose or connector corroded High fuel consumption
Lack of power
Jerky, loss of power (misfiring)
Tighten Knock Sensor 2 (20Nm, 11-18 ft lb)
Open/short circuit in wiring between G66 and J192 (ECM) High fuel consumption
Lack of power
Jerky, loss of power (misfiring)
Repair open or short circuit in wiring
Short circuit between G66 and ground or to shielding High fuel consumption
Lack of power
Jerky, loss of power (misfiring)
Repair open or short circuit in wiring
G66 faulty High fuel consumption
Lack of power
Jerky, loss of power (misfiring)
Replace Knock Sensor 2 (G66)
Input for G66 in J192 (ECM) faulty (ECM faulty) High fuel consumption
Lack of power
Jerky, loss of power (misfiring)
Repair or replace J192 (ECM)
--------------------------------------------------------------------------------
2212
Throttle position sensor G69 Possible Cause Possible
Effects Corrective Steps
Open circuit in wiring between throttle position sensor G69 and J192 (ECM) Lack of power and driveability problems Repair wiring
Short circuit to positive or ground in G69 or in wiring connection between G69 and J192 (ECM) Lack of power and driveability problems Repair wiring
G69 Faulty Lack of power and driveability problems Replace Throttle Position Sensor G69
J192 (ECM) Lack of power and driveability problems Repair or replace connector J192 at ECM
Dampness and/or corrosion at G69 harness connector Lack of power and driveability problems Clean and dry G69 harness connector
Throttle Position sensor incorrectly adjusted Lack of power and driveability problems Re-adjust throttle position sensor
--------------------------------------------------------------------------------
2233
Mass air flow sensor ref. voltage Possible Cause Corrective Steps
Open circuit between J192 (ECM) connector A, terminals 5 and 2 Repair open/short circuit in wiring
Short circuit between J192 (ECM) connector A, terminals 5 and 2 and positive (B+) Repair open/short circuit in wiring
--------------------------------------------------------------------------------
2234
Supply Voltage (B+). If this code is sporadic (i.e. does not re-occur after codes are cleared) then disregard the display. This malfunction can be generated and stored if the engine idles for a long time with many electrical consumers switched ON and the battery discharged. This code will be stored if the supply voltage falls below 10.08 volts for longer than 1 second (the ECM will not operate below 6.5 volts). Possible Cause Possible
Effects Corrective Steps
Supply voltage greater than 16 volts Damage to ECM (J192) Check voltage
Check battery charge status
Check supply voltage of ECM
Generator faulty Damage to ECM (J192) Check generator
Check voltage regulator
Check air duct leading to generator
Overvoltage spike because of a starting aid Damage to ECM (J192) Check voltage
Check battery charge status
Check supply voltage of ECM
Discontinue use of starting aid
Poor ground connection to J192 (ECM) Voltage less than 6 volts
Engine does not run
Repair ground connection to J192 (ECM)
Battery discharged Voltage less than 6 volts
Engine does not run
Check battery charge status
Check status of serpentine belt
Check voltage regulator
Significant current draw (with ignition switched off) Voltage less than 6 volts
Engine does not run
Find and repair device drawing excessive current
--------------------------------------------------------------------------------
2312
Engine coolant temperature sensor: G62 Possible Cause Possible
Effects Corrective Steps
Short circuit to ground Cold start problems at very low temperatures
Driving problems when warmed up
Repair wiring at G62
Moisture in engine coolant temperature sensor G62 harness connector Cold start problems at very low temperatures
Driving problems when warmed up
Clean and dry engine coolant temperature sensor G62 harness connector
Open circuit between G62 and J192 (ECM) Cold start problems at very low temperatures
Driving problems when warmed up
Repair faulty wiring
High resistance between G62 and J192 (ECM) Cold start problems at very low temperatures
Driving problems when warmed up
Find and replace damaged wiring or connector
Engine coolant temperature sensor G62 faulty Cold start problems at very low temperatures
Driving problems when warmed up
Repair or replace engine coolant temperature sensor G62
Input from G62 in J192 (ECM) faulty (J192 faulty) Cold start problems at very low temperatures
Driving problems when warmed up
Repair or replace J192 (ECM)
--------------------------------------------------------------------------------
2324
Mass Air Flow Sensor: G70. If this code is sporadic (it does not reappear after clearing the codes) then disregard the display. Possible Cause Possible
Effects Corrective Steps
Auxiliary fuse 27 faulty Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Check/replace auxiliary fuse 27
Open circuit in wiring between Mass Air Flow sensor G70 and J192 (ECM) Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Repair faulty wiring between mass air flow sensor G70 and J192 (ECM)
Voltage supply to G70 interrupted and/or ground short Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Repair faulty wiring at G70
Short to positive (B+) or GND in G70 and/or in the wiring connection between G70 and J192 (ECM) Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Repair faulty wiring at G70
Mass air flow sensor G70 faulty Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Replace mass air flow sensor G70
Input for G70 in J192 (ECM) faulty (J192 faulty) Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Repair/replace J192 (ECM)
--------------------------------------------------------------------------------
2331
Oxygen Sensor Control II Possible Cause Possible
Effects Corrective Steps
Auxiliary fuse 28 faulty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check/replace auxiliary fuse 28
Fuel tank empty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Fill fuel tank
Fuel system pressure too low CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose fuel system
Fuel system pressure too high CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose fuel system
Malfunction of spark plugs, spark plug connectors, ignition wires CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check/replace spark plugs/ignition wires
Intake air leak down stream of mass air flow sensor G70 CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Repair leak
Leak in exhaust system before three way catalyst CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Repair leak
Oxygen sensor faulty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose oxygen sensor failure
EVAP canister purge regulator valve N80 sticks CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check EVAP canister purge regulator valve N80
--------------------------------------------------------------------------------
2332
Heated Oxygen Sensor II: G108 Possible Cause Possible
Effects Corrective Steps
Open circuit in wiring J192 (ECM) Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair open circuit in wiring
Prove heater does not work Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Check Oxygen sensor control
Auxiliary fuse 28 (Oxygen sensor heater) faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Check/replace Auxiliary fuse 28
Heater resistance faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Replace faulty oxygen sensor G108
Signal wire has short circuit to shielding or ground Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair short circuit in wiring
Oxygen sensor heater wiring Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair faulty wiring
Heated oxygen sensor probe faulty (dirty) Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair faulty oxygen sensor G108
--------------------------------------------------------------------------------
2341
Oxygen Sensor Control Possible Cause Possible
Effects Corrective Steps
Auxiliary fuse 28 faulty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check/replace auxiliary fuse 28
Fuel tank empty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Fill fuel tank
Fuel system pressure too low CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose fuel system
Fuel system pressure too high CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose fuel system
Malfunction of spark plugs, spark plug connectors, ignition wires CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check/replace spark plugs/ignition wires
Intake air leak down stream of mass air flow sensor G70 CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Repair leak
Leak in exhaust system before three way catalyst CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Repair leak
Oxygen sensor faulty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose oxygen sensor failure
EVAP canister purge regulator valve N80 sticks CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check EVAP canister purge regulator valve N80
--------------------------------------------------------------------------------
2342
Heated Oxygen Sensor: G39 Possible Cause Possible
Effects Corrective Steps
Open circuit in wiring to J192 (ECM) Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair open circuit in wiring
Check O2 Sensor control
Probe heater faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Replace faulty oxygen sensor G39
Auxiliary fuse no. 28 (probe heater) faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Check and replace auxiliary fuse no. 28
Oxygen sensor heater faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Replace faulty oxygen sensor G39
Oxygen sensor heater wiring faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair/replace oxygen sensor heater wiring
Short to ground or short to shielding in signal wire Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair/replace faulty signal wire
Heated oxygen sensor probe faulty/dirty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Replace oxygen sensor G39
--------------------------------------------------------------------------------
2411
EGR System or EGR temperature sensor G98 Possible Cause Possible
Effects Corrective Steps
Vacuum hoses pulled off or kinked Poor idle, poor starting performance
Bucking
Check EGR hoses
EGR temperature sensor G98 faulty Poor idle, poor starting performance
Bucking
Diagnose EGR temperature sensor G98
EGR valve faulty Poor idle, poor starting performance
Bucking
Clean/check EGR valve
Auxiliary fuse 28 faulty Poor idle, poor starting performance
Bucking
Check/replace auxiliary fuse 28
EGR vacuum regulator solenoid valve N18 faulty Poor idle, poor starting performance
Bucking
Repair/replace EGR vacuum regulator solenoid valve N18
Open circuit in wiring between G98, EGR vacuum regulator valve N121, and J192 (ECM) Poor idle, poor starting performance
Bucking
Check all wiring, repair/replace faulty wiring
Short/open circuit to ground in EGR temperature sensor G98 and/or in the wiring connection between G98 and J192 (ECM) Repair open or short circuit in wiring
--------------------------------------------------------------------------------
4332
Ignition Outputs 1, 2, or 3. Possible Cause Possible
Effects Corrective Steps
Short to positive or ground in the ignition output stage and/or wiring connection J192 (ECM) and power output stage N122 Engine does not start
Loss of power
Engine runs rough
Repair open or short circuit in wiring
Check power output stage N122
J192 (ECM) faulty Engine does not start
Loss of power
Engine runs rough
Repair/replace ECM
--------------------------------------------------------------------------------
4333
Intake manifold changeover valve: N156 Possible Cause Possible
Effects Corrective Steps
Short circuit to ground in intake manifold changeover valve N156 and/or in the wiring connection between N156 and J192 (ECM) Valve does not open (loss of power)
N156 valve open continuously (reduced torque)
Repair short circuit in wiring
Circuit breaker (brown) faulty Valve does not open (loss of power)
N156 valve open continuously (reduced torque)
Reset/replace circuit breaker
Open circuit in wiring between N156 and J192 (ECM) Valve does not open (loss of power)
N156 valve open continuously (reduced torque)
Repair open or short in wiring
J192 (ECM) Faulty Valve does not open (loss of power)
N156 valve open continuously (reduced torque)
Replace ECM
--------------------------------------------------------------------------------
4343
EVAP canister purge regulator valve N80 Possible Cause Possible
Effects Corrective Steps
Short circuit to positive in EVAP canister purge regulator valve N80 or between N80 and J192 (ECM) Poor transition performance in partial load range
Fuel odors may be present
Repair short circuit in wiring
Short circuit to ground in N80 or between N80 and J192 (ECM) Poor transition performance in partial load range
Fuel odors may be present
Repair short circuit in wiring
Auxiliary fuse 28 faulty Poor transition performance in partial load range
Fuel odors may be present
Check/replace auxiliary fuse 28
Open circuit in wiring Poor transition performance in partial load range
Fuel odors may be present
Repair open circuit in wiring
J192 (ECM) faulty Poor transition performance in partial load range
Fuel odors may be present
Repair/replace J192 (ECM)
--------------------------------------------------------------------------------
4411
Injector, Cyl. 1 (N30) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
--------------------------------------------------------------------------------
4412
Injector, Cyl. 2 (N31) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
Short circuit to ground in EGR vacuum regulator solenoid valve N18 Uneven idle Repair short circuit in wiring
Open circuit in the wiring connection between N18 and J192 (ECM) Uneven idle Repair open circuit in wiring
--------------------------------------------------------------------------------
4413
Injector, Cyl. 3 (N32) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
--------------------------------------------------------------------------------
4414
Injector, Cyl. 4 (N33) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
--------------------------------------------------------------------------------
4421
Injector, Cyl. 5 (N83) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
--------------------------------------------------------------------------------
4422
Injector, Cyl. 6 (N84) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
--------------------------------------------------------------------------------
4431
Outside air in intake air system/Idle air control valve N71 Possible Cause Possible
Effects Corrective Steps
Large quantity air leak Engine speed deviates from specification at engine operating temperature
Engine may die if cold
Find and stop air leak
Idle air valve N71 mechanically faulty Engine speed deviates from specification at engine operating temperature
Engine may die if cold
Check idle air valve N71
Secondary throttle valve does not close Engine speed deviates from specification at engine operating temperature
Engine may die if cold
Diagnose throttle body valve
Short circuit to positive in idle air control valve N71 and/or in the wiring connection between N71 and J192 (ECM) Engine speed deviates from spec at engine operating temperature
Engine may die when cold
Engine idle hunts
Repair short circuit in wiring
Short circuit to ground in N71 and J192 (ECM) Engine speed deviates from spec at engine operating temperature
Engine may die when cold
Engine idle hunts
Repair short circuit in wiring
Open circuit in wiring Engine speed deviates from spec at engine operating temperature
Engine may die when cold
Engine idle hunts
Repair open circuit in wiring
Large air leak Engine speed deviates from spec at engine operating temperature
Engine may die when cold
Engine idle hunts
Diagnose and repair air leak
Audi's with On Board Diagnostics (OBD) can store trouble codes (DTC's) if the computer thinks anything is wrong with the car.
Procedure for dumping DTC's:
Note: This procedure assumes that you have an Malfunction Indicator Lamp and that it is operational. If not, use the test-light method.
Note: This procedure is for the '93-'95 80/90 series with the 2.8l engine. For 100/A6 cars, the connectors are reversed. For 2.6l cars, this procedure probably doesn't work; try it at your own risk. If you figure out how it works, Tell me how! If you're not sure, don't try it.
Step 1: Getting ready.
First, make sure that your Malfunction Indicator Lamp (MIL) is working. To do this, turn the ignition switch ON, and observe the dash lights. You should see something like the picture on the left. The MIL is the orange one that says "CHECK" and has a picture of an engine on it. If you don't see this lamp, use the test-light method. Picture coming soon!
Next, find the connectors you will need to use. These connectors are in the fuse box, which is under the hood right behind the firewall on the driver's side. Open the fusebox, and look for the two connectors on the left-hand side of the box (viewed from the front of the car). You'll want to connect the right-hand pin of the connector closest to you with the right-hand pin of the connector behind it.
Step 2: Getting the codes.
You should try to view the DTC codes with the engine running. If the engine will not start or keep running, use the "Engine does not run" procedure.
Start the engine and let it idle.
With the engine running, connect the two pins (on the connectors you identified in step 1) for at least 4 seconds.
Disconnect the two pins.
Count and record codes as they are displayed on the MIL:
Each code is comprised of 4 groups of flashes with a maximum of 4 flashes per group.
Between each group (one code) there is a pause of about 2.5 seconds before the next code starts to flash.
After all codes are displayed, the code 0000 (end of output) will display. The 0000 code is four 2.5 second flashes at 2.5 second intervals.
If no codes are present, code 4444 will display.
Refer to the chart of blink codes for an explanation of your codes.
To clear the codes, connect the other left-hand pins of the two connectors for at least 4 seconds.
Step 2: Getting the codes (if engine does not run).
1: Crank the engine for 5 to 6 seconds, then leave the ignition switch turned ON after cranking.
CAUTION: Do not crank the engine for longer than 15 seconds! Allow one minute between crank attempts for the starter motor to cool down.
2: Connect the two pins (on the connectors you identified in step 1) for at least 4 seconds.
3: Disconnect the two pins.
4: Count and record codes as they are displayed on the MIL:
5: Each code is comprised of 4 groups of flashes with a maximum of 4 flashes per group.
6: Between each group (one code) there is a pause of about 2.5 seconds before the next code starts to flash.
Note: One of the codes you will get will be code 2111. This code (engine speed sensor) is always displayed when the ignition switch is ON and the engine is not running. This fault display is normal and can be ignored when the engine is not running.
7: Repeat steps 2 and 3, because only one code will be displayed each time.
8: Continue repeating steps 2 and 3 until code 0000 (end of output) is displayed. The 0000 code is four 2.5 second flashes at 2.5 second intervals.
Refer to the chart of blink codes for an explanation of your codes.
To clear the codes, connect the other left-hand pins of the two connectors for at least 4 seconds.
Diagnostic Trouble Codes
--------------------------------------------------------------------------------
4444
No DTC recognized.
--------------------------------------------------------------------------------
0000
Display ends.
--------------------------------------------------------------------------------
1111
Control Module Malfunctioning. This malfunction type is registered when malfunctions are recognized in the ROM, RAM, or EEPROM of the ECU. Possible Cause Possible
Effects Corrective Steps
Ground connections to ECM: J192 connector D terminals 1,2,3, and 16 Engine does not start Check GND connections
ECM faulty Engine does not start Repair/Replace ECM
--------------------------------------------------------------------------------
1231
Vehicle Speed Sensor G68 Possible Cause Possible
Effects Corrective Steps
Vehicle speed sensor (VSS) faulty Vehicle dies while decelerating
Load change jolt
Replace VSS
Wiring connection between VSS and speedometer faulty Vehicle dies while decelerating
Load change jolt
Check wiring connections between VSS and instrument cluster
Wiring connection between instrument cluster and ECM faulty Vehicle dies while decelerating
Load change jolt
Check wiring connections between instrument cluster and ECM
ECM Faulty Vehicle dies while decelerating
Load change jolt
Repair or replace ECM
--------------------------------------------------------------------------------
2111
Engine speed sensor G28. Related symptoms could be lack of ignition of fuel injection while cranking. Possible Cause Possible
Effects Corrective Steps
Debris on engine speed (RPM) sensor G28 Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Sensor G28 socket loose Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Distance from G28 to flywheel ring gear greater than 1.2mm (3/64 in) Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Broken teeth on flywheel ring gear Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Open circuit between ECM connector J192 and G28 Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Short circuit between connector C terminals 1,2, and 3 and J192 and/or shielding or ground Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Open circuit in G28 shielding Engine does not start
Ignition misfires
Engine dies
Check RPM sensor and related connectors
Open circuit between 3-pin connector in engine compartment and G28 Engine does not start
Ignition misfires
Engine dies
Repair short or open circuit
3-pin connector from G28 and connector G4 reversed Engine does not start Connect G4(Crankshaft position sensor) and G28 connector properly
Sensor G28 faulty Engine does not start Connect G4(Crankshaft position sensor) and engine speed (RPM) sensor connector properly
Input for G28 in J192 (ECM) faulty Engine does not start Connect G4(Crankshaft position sensor) and G28 sensors properly
--------------------------------------------------------------------------------
2112
Crankshaft position sensor: G4. Possible Cause Possible
Effects Corrective Steps
Crankshaft Position sensor G4 loose Malfunction occurs before engine start; engine does not start Check crankshaft position sensor G4
Distance from G4 to crankshaft counterweight greater than 1.3mm (0.051in) Malfunction occurs before engine start; engine does not start Check crankshaft position sensor G4
Open circuit in wiring between 3-pin connector in engine compartment and G4 Malfunction occurs after engine started Repair open circuit in wiring connector
Short circuit between connector C terminals 4,5, and 6 and ECM J192 and/or shielding and/or ground Malfunction occurs after engine started Repair or replace ECM connector J192 (ECM)
Repair short circuit in wiring
Open circuit in wiring in G4 shielding Malfunction occurs after engine started Repair open circuit in G4 shielding
Input for G4 in J192 (ECM) faulty Malfunction occurs after engine started Repair or replace connector J192 (ECM)
3-pin plug connector of G4 and G28(RPM sensor) reversed in engine compartment Engine does not start Connect 3-pin connectors of G4 and G28 correctly
--------------------------------------------------------------------------------
2113
Camshaft position sensor: G40. Possible Cause Possible
Effects Corrective Steps
Supply voltage for camshaft position sensor G40 from J192 (ECM) Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Check camshaft position sensor G40
Repair circuit wiring
Open circuit in signal wire to J192 (ECM) and/or short to ground of signal wire in connector C terminals 7,8, and 9 Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Repair short or open circuit in wiring
Open circuit between 3-pin connector in engine compartment and J192 (ECM) Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Repair short or open circuit in wiring
Assignment of groove on crankshaft counterweight (Sensor G4 also shows error) Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Check Camshaft position sensor G40
Sensor G40 faulty Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Repair or replace sensor G40
Input for G4 in J192 (ECM) faulty Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Repair wiring in connector
Cam timing off Engine has no power at Wide Open Throttle (WOT)
Measured emission values not OK
High fuel consumption
Check cam timing
--------------------------------------------------------------------------------
2121
Closed Throttle Position Switch: F60 Possible Cause Corrective Steps
Throttle valve sticking Clean/adjust throttle valve
Adjust accelerator pedal cable
Floor mat presses on accelerator pedal Re-position floor mat using orange posts
Accelerator pedal cable out of adjustment Adjust accelerator pedal cable
Open circuit in wiring to connector A, terminal 9 of J192 (ECM) Repair open/short circuit in wiring
Input F60 in J192 (ECM) faulty Repair wiring in connector
Connector A terminal 9 of J192 (ECM) has short circuit to ground Repair open/short circuit in wiring
Moisture in throttle connector Clean and dry throttle connector
--------------------------------------------------------------------------------
2141
Knock sensor controls, Cyl.'s 1, 2, or 3 (must use VAG1551 to determine which Cyl) Possible Cause Possible
Effects Corrective Steps
Knock regulation module in ECM (J192) faulty High fuel consumption
Loss of power
Engine runs rough
Max. speed is not reached
Repair/replace J192 (ECM)
Poor fuel quality, octane lower than 95 RON High fuel consumption
Loss of power
Engine runs rough
Max. speed is not reached
Fill tank with fuel having octane of at least 95 RON
Abnormal engine noise (attached component loose) High fuel consumption
Loss of power
Engine runs rough
Max. speed is not reached
Tighten knock sensor and whatever is loose
Open circuit in wiring in knock sensor G61 shielding High fuel consumption
Loss of power
Engine runs rough
Max. speed is not reached
Repair open circuit in wiring
Knock sensor loose High fuel consumption
Loss of power
Engine runs rough
Max. speed is not reached
Tighten knock sensor
--------------------------------------------------------------------------------
2142
Knock sensor 1: G61. Ignition timing may be retarded by 12o when this code is stored. Possible Cause Possible
Effects Corrective Steps
Knock sensor 1 loose or connector corroded High fuel consumption
Lack of power
Jerky, loss of power (like misfiring)
Tightening torque: 20Nm (15 ft lb)
Repair open or short circuit in wiring
Open circuit or short circuit in wiring between G61 and J192 (ECM) High fuel consumption
Lack of power
Jerky, loss of power (like misfiring)
Repair open or short circuit in wiring
Short circuit between G61 and ground or to shielding High fuel consumption
Lack of power
Jerky, loss of power (like misfiring)
Repair open or short circuit in wiring
G61 Faulty High fuel consumption
Lack of power
Jerky, loss of power (like misfiring)
Replace Knock Sensor 1: G61
Input for G61 in J192 (ECM) faulty High fuel consumption
Lack of power
Jerky, loss of power (like misfiring)
Repair or replace J192 (ECM)
--------------------------------------------------------------------------------
2143
Knock Sensor Control, Cyl.'s 4, 5, 6 Possible Cause Possible
Effects Corrective Steps
Knock regulation module in J192 (ECM) High fuel consumption
Loss of power
Engine runs rough
Max. Speed is not reached
Repair/Replace J192 (ECM)
Poor fuel quality, octane lower than 95 RON High fuel consumption
Loss of power
Engine runs rough
Max. Speed is not reached
Fill tank with fuel having an octane of at least 95 RON
Abnormal engine noise (attached component loose) High fuel consumption
Loss of power
Engine runs rough
Max. Speed is not reached
Tighten knock sensor to 20Nm (15 ft lb), tighten whatever is loose
Open circuit in wiring Knock Sensor 2 (G66) shielding High fuel consumption
Loss of power
Engine runs rough
Max. Speed is not reached
Repair open circuit in wiring
Knock Sensor 2 loose High fuel consumption
Loss of power
Engine runs rough
Max. Speed is not reached
Tighten knock sensor 2 to 20Nm (15 ft lb)
--------------------------------------------------------------------------------
2144
Knock Sensor 2: G66. When this error occurs, the ignition timing may be retarded by 12o (crankshaft) in the knocking areas of the ignition map. Possible Cause Possible
Effects Corrective Steps
Knock sensor 2 G66 loose or connector corroded High fuel consumption
Lack of power
Jerky, loss of power (misfiring)
Tighten Knock Sensor 2 (20Nm, 11-18 ft lb)
Open/short circuit in wiring between G66 and J192 (ECM) High fuel consumption
Lack of power
Jerky, loss of power (misfiring)
Repair open or short circuit in wiring
Short circuit between G66 and ground or to shielding High fuel consumption
Lack of power
Jerky, loss of power (misfiring)
Repair open or short circuit in wiring
G66 faulty High fuel consumption
Lack of power
Jerky, loss of power (misfiring)
Replace Knock Sensor 2 (G66)
Input for G66 in J192 (ECM) faulty (ECM faulty) High fuel consumption
Lack of power
Jerky, loss of power (misfiring)
Repair or replace J192 (ECM)
--------------------------------------------------------------------------------
2212
Throttle position sensor G69 Possible Cause Possible
Effects Corrective Steps
Open circuit in wiring between throttle position sensor G69 and J192 (ECM) Lack of power and driveability problems Repair wiring
Short circuit to positive or ground in G69 or in wiring connection between G69 and J192 (ECM) Lack of power and driveability problems Repair wiring
G69 Faulty Lack of power and driveability problems Replace Throttle Position Sensor G69
J192 (ECM) Lack of power and driveability problems Repair or replace connector J192 at ECM
Dampness and/or corrosion at G69 harness connector Lack of power and driveability problems Clean and dry G69 harness connector
Throttle Position sensor incorrectly adjusted Lack of power and driveability problems Re-adjust throttle position sensor
--------------------------------------------------------------------------------
2233
Mass air flow sensor ref. voltage Possible Cause Corrective Steps
Open circuit between J192 (ECM) connector A, terminals 5 and 2 Repair open/short circuit in wiring
Short circuit between J192 (ECM) connector A, terminals 5 and 2 and positive (B+) Repair open/short circuit in wiring
--------------------------------------------------------------------------------
2234
Supply Voltage (B+). If this code is sporadic (i.e. does not re-occur after codes are cleared) then disregard the display. This malfunction can be generated and stored if the engine idles for a long time with many electrical consumers switched ON and the battery discharged. This code will be stored if the supply voltage falls below 10.08 volts for longer than 1 second (the ECM will not operate below 6.5 volts). Possible Cause Possible
Effects Corrective Steps
Supply voltage greater than 16 volts Damage to ECM (J192) Check voltage
Check battery charge status
Check supply voltage of ECM
Generator faulty Damage to ECM (J192) Check generator
Check voltage regulator
Check air duct leading to generator
Overvoltage spike because of a starting aid Damage to ECM (J192) Check voltage
Check battery charge status
Check supply voltage of ECM
Discontinue use of starting aid
Poor ground connection to J192 (ECM) Voltage less than 6 volts
Engine does not run
Repair ground connection to J192 (ECM)
Battery discharged Voltage less than 6 volts
Engine does not run
Check battery charge status
Check status of serpentine belt
Check voltage regulator
Significant current draw (with ignition switched off) Voltage less than 6 volts
Engine does not run
Find and repair device drawing excessive current
--------------------------------------------------------------------------------
2312
Engine coolant temperature sensor: G62 Possible Cause Possible
Effects Corrective Steps
Short circuit to ground Cold start problems at very low temperatures
Driving problems when warmed up
Repair wiring at G62
Moisture in engine coolant temperature sensor G62 harness connector Cold start problems at very low temperatures
Driving problems when warmed up
Clean and dry engine coolant temperature sensor G62 harness connector
Open circuit between G62 and J192 (ECM) Cold start problems at very low temperatures
Driving problems when warmed up
Repair faulty wiring
High resistance between G62 and J192 (ECM) Cold start problems at very low temperatures
Driving problems when warmed up
Find and replace damaged wiring or connector
Engine coolant temperature sensor G62 faulty Cold start problems at very low temperatures
Driving problems when warmed up
Repair or replace engine coolant temperature sensor G62
Input from G62 in J192 (ECM) faulty (J192 faulty) Cold start problems at very low temperatures
Driving problems when warmed up
Repair or replace J192 (ECM)
--------------------------------------------------------------------------------
2324
Mass Air Flow Sensor: G70. If this code is sporadic (it does not reappear after clearing the codes) then disregard the display. Possible Cause Possible
Effects Corrective Steps
Auxiliary fuse 27 faulty Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Check/replace auxiliary fuse 27
Open circuit in wiring between Mass Air Flow sensor G70 and J192 (ECM) Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Repair faulty wiring between mass air flow sensor G70 and J192 (ECM)
Voltage supply to G70 interrupted and/or ground short Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Repair faulty wiring at G70
Short to positive (B+) or GND in G70 and/or in the wiring connection between G70 and J192 (ECM) Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Repair faulty wiring at G70
Mass air flow sensor G70 faulty Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Replace mass air flow sensor G70
Input for G70 in J192 (ECM) faulty (J192 faulty) Goes to limp home mode
Takes gas poorly
Lack of power
Sometimes engine dies after start or during fuel shut-off phase
Repair/replace J192 (ECM)
--------------------------------------------------------------------------------
2331
Oxygen Sensor Control II Possible Cause Possible
Effects Corrective Steps
Auxiliary fuse 28 faulty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check/replace auxiliary fuse 28
Fuel tank empty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Fill fuel tank
Fuel system pressure too low CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose fuel system
Fuel system pressure too high CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose fuel system
Malfunction of spark plugs, spark plug connectors, ignition wires CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check/replace spark plugs/ignition wires
Intake air leak down stream of mass air flow sensor G70 CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Repair leak
Leak in exhaust system before three way catalyst CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Repair leak
Oxygen sensor faulty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose oxygen sensor failure
EVAP canister purge regulator valve N80 sticks CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check EVAP canister purge regulator valve N80
--------------------------------------------------------------------------------
2332
Heated Oxygen Sensor II: G108 Possible Cause Possible
Effects Corrective Steps
Open circuit in wiring J192 (ECM) Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair open circuit in wiring
Prove heater does not work Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Check Oxygen sensor control
Auxiliary fuse 28 (Oxygen sensor heater) faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Check/replace Auxiliary fuse 28
Heater resistance faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Replace faulty oxygen sensor G108
Signal wire has short circuit to shielding or ground Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair short circuit in wiring
Oxygen sensor heater wiring Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair faulty wiring
Heated oxygen sensor probe faulty (dirty) Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair faulty oxygen sensor G108
--------------------------------------------------------------------------------
2341
Oxygen Sensor Control Possible Cause Possible
Effects Corrective Steps
Auxiliary fuse 28 faulty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check/replace auxiliary fuse 28
Fuel tank empty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Fill fuel tank
Fuel system pressure too low CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose fuel system
Fuel system pressure too high CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose fuel system
Malfunction of spark plugs, spark plug connectors, ignition wires CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check/replace spark plugs/ignition wires
Intake air leak down stream of mass air flow sensor G70 CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Repair leak
Leak in exhaust system before three way catalyst CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Repair leak
Oxygen sensor faulty CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Diagnose oxygen sensor failure
EVAP canister purge regulator valve N80 sticks CO before three way catalyst is less than 3%
Increased fuel consumption
Black smoke
Spark plug fouling
CO before three way catalyst is greater than 1%
Check EVAP canister purge regulator valve N80
--------------------------------------------------------------------------------
2342
Heated Oxygen Sensor: G39 Possible Cause Possible
Effects Corrective Steps
Open circuit in wiring to J192 (ECM) Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair open circuit in wiring
Check O2 Sensor control
Probe heater faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Replace faulty oxygen sensor G39
Auxiliary fuse no. 28 (probe heater) faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Check and replace auxiliary fuse no. 28
Oxygen sensor heater faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Replace faulty oxygen sensor G39
Oxygen sensor heater wiring faulty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair/replace oxygen sensor heater wiring
Short to ground or short to shielding in signal wire Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Repair/replace faulty signal wire
Heated oxygen sensor probe faulty/dirty Exhaust emissions out of spec
Oxygen sensor control goes into open loop
Replace oxygen sensor G39
--------------------------------------------------------------------------------
2411
EGR System or EGR temperature sensor G98 Possible Cause Possible
Effects Corrective Steps
Vacuum hoses pulled off or kinked Poor idle, poor starting performance
Bucking
Check EGR hoses
EGR temperature sensor G98 faulty Poor idle, poor starting performance
Bucking
Diagnose EGR temperature sensor G98
EGR valve faulty Poor idle, poor starting performance
Bucking
Clean/check EGR valve
Auxiliary fuse 28 faulty Poor idle, poor starting performance
Bucking
Check/replace auxiliary fuse 28
EGR vacuum regulator solenoid valve N18 faulty Poor idle, poor starting performance
Bucking
Repair/replace EGR vacuum regulator solenoid valve N18
Open circuit in wiring between G98, EGR vacuum regulator valve N121, and J192 (ECM) Poor idle, poor starting performance
Bucking
Check all wiring, repair/replace faulty wiring
Short/open circuit to ground in EGR temperature sensor G98 and/or in the wiring connection between G98 and J192 (ECM) Repair open or short circuit in wiring
--------------------------------------------------------------------------------
4332
Ignition Outputs 1, 2, or 3. Possible Cause Possible
Effects Corrective Steps
Short to positive or ground in the ignition output stage and/or wiring connection J192 (ECM) and power output stage N122 Engine does not start
Loss of power
Engine runs rough
Repair open or short circuit in wiring
Check power output stage N122
J192 (ECM) faulty Engine does not start
Loss of power
Engine runs rough
Repair/replace ECM
--------------------------------------------------------------------------------
4333
Intake manifold changeover valve: N156 Possible Cause Possible
Effects Corrective Steps
Short circuit to ground in intake manifold changeover valve N156 and/or in the wiring connection between N156 and J192 (ECM) Valve does not open (loss of power)
N156 valve open continuously (reduced torque)
Repair short circuit in wiring
Circuit breaker (brown) faulty Valve does not open (loss of power)
N156 valve open continuously (reduced torque)
Reset/replace circuit breaker
Open circuit in wiring between N156 and J192 (ECM) Valve does not open (loss of power)
N156 valve open continuously (reduced torque)
Repair open or short in wiring
J192 (ECM) Faulty Valve does not open (loss of power)
N156 valve open continuously (reduced torque)
Replace ECM
--------------------------------------------------------------------------------
4343
EVAP canister purge regulator valve N80 Possible Cause Possible
Effects Corrective Steps
Short circuit to positive in EVAP canister purge regulator valve N80 or between N80 and J192 (ECM) Poor transition performance in partial load range
Fuel odors may be present
Repair short circuit in wiring
Short circuit to ground in N80 or between N80 and J192 (ECM) Poor transition performance in partial load range
Fuel odors may be present
Repair short circuit in wiring
Auxiliary fuse 28 faulty Poor transition performance in partial load range
Fuel odors may be present
Check/replace auxiliary fuse 28
Open circuit in wiring Poor transition performance in partial load range
Fuel odors may be present
Repair open circuit in wiring
J192 (ECM) faulty Poor transition performance in partial load range
Fuel odors may be present
Repair/replace J192 (ECM)
--------------------------------------------------------------------------------
4411
Injector, Cyl. 1 (N30) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
--------------------------------------------------------------------------------
4412
Injector, Cyl. 2 (N31) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
Short circuit to ground in EGR vacuum regulator solenoid valve N18 Uneven idle Repair short circuit in wiring
Open circuit in the wiring connection between N18 and J192 (ECM) Uneven idle Repair open circuit in wiring
--------------------------------------------------------------------------------
4413
Injector, Cyl. 3 (N32) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
--------------------------------------------------------------------------------
4414
Injector, Cyl. 4 (N33) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
--------------------------------------------------------------------------------
4421
Injector, Cyl. 5 (N83) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
--------------------------------------------------------------------------------
4422
Injector, Cyl. 6 (N84) Possible Cause Possible
Effects Corrective Steps
Circuit breaker (red) faulty Engine running rough
Engine stalling
Reset/replace circuit breaker
Short to ground Engine running rough
Engine stalling
Repair short circuit in wiring
Open circuit in wiring Engine running rough
Engine stalling
Repair open circuit in wiring
Short circuit to positive on connector and/or fuel injector Engine running rough
Engine stalling
Repair short circuit
J192 (ECM) faulty Engine running rough
Engine stalling
Repair/replace ECM
--------------------------------------------------------------------------------
4431
Outside air in intake air system/Idle air control valve N71 Possible Cause Possible
Effects Corrective Steps
Large quantity air leak Engine speed deviates from specification at engine operating temperature
Engine may die if cold
Find and stop air leak
Idle air valve N71 mechanically faulty Engine speed deviates from specification at engine operating temperature
Engine may die if cold
Check idle air valve N71
Secondary throttle valve does not close Engine speed deviates from specification at engine operating temperature
Engine may die if cold
Diagnose throttle body valve
Short circuit to positive in idle air control valve N71 and/or in the wiring connection between N71 and J192 (ECM) Engine speed deviates from spec at engine operating temperature
Engine may die when cold
Engine idle hunts
Repair short circuit in wiring
Short circuit to ground in N71 and J192 (ECM) Engine speed deviates from spec at engine operating temperature
Engine may die when cold
Engine idle hunts
Repair short circuit in wiring
Open circuit in wiring Engine speed deviates from spec at engine operating temperature
Engine may die when cold
Engine idle hunts
Repair open circuit in wiring
Large air leak Engine speed deviates from spec at engine operating temperature
Engine may die when cold
Engine idle hunts
Diagnose and repair air leak
01-20-2004, 08:48 AM
#25
AudiWorld Super User
Thread Starter
Third Party RF Remote Control
PS. I did it myself - cost $50 and works like a charm.<ul><li><a href="https://forums.audiworld.com/a6100/msgs/20147.phtml">click here</a></li></ul>
01-26-2004, 01:27 PM
#30
Coolant Flush & Fill
<ul><li><a href="http://www.mnsi.net/~natwhite/Audi/Coolant%20Flush%20&%20Fill%20Procedure.htm">ht tp://www.mnsi.net/~natwhite/Audi/Coolant%20Flush%20&%20Fill%20Procedure.htm</a</li></ul>