I am new to VAG-Com so please excuse my ignorance. Using the Vag-com I run the scan (engine off) and I see engine fault codes. I clear fault codes and rescan. Some scans return the same codes (some or all). Sometimes the rescan returns no faults. But if i run the scan again a fault code will return. The fualts returned are always a subset of the original codes (never a new fault). I don't understand why this is happening given that the motor is not running and therefore how can the codes be produced? I would appreciate any help here.

BTW: I am using Release 303-1

Mike Benno
A6 2.7t

 

Can you copy and paste an example of what you are seeing?

 

The following is a summary of the output. My user activities are denoted by "--->" I re-assembled this from several daily files. I can go make a more thurough copy of a standardized test. I think there is some variation between the full scan and the individual scan. It seems as is doing one and then the other will cause these ghosts to appear, or maybe my car is hosed.

---> Installed new Mass Air Flow Sensor
---> DTC Output on 09/05/03 10:00pm (Engine module scan only)
VAG-COM Version: Release 303.1

Control Module Part Number: 4B0 907 551 K
Component and/or Version: 2.7l V6/5VT G 0005
Software Coding: 06612
Work Shop Code: WSC 00000
6 Faults Found:
16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-10 - - - Intermittent
17862 - Exhaust Gas Temp Sensor 1 (G235): Short to Ground
P1454 - 35-10 - - - Intermittent

---> Clear DTC codes
---> DTC Output on 09/05/03 (Full module scan but only engine shown)
VAG-COM Version: Release 303.1


Chassis Type: 4B - C5 Audi A6
Scan: 01,02,03,08,15,16,17,35,36,37,45,55,56

Address 01 -------------------------------------------------------
Controller: 4B0 907 551 K
Component: 2.7l V6/5VT G 0005
Coding: 06612
Shop #: WSC 00000
5 Faults Found:
16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-10 - - - Intermittent
17862 - Exhaust Gas Temp Sensor 1 (G235): Short to Ground
P1454 - 35-10 - - - Intermittent
17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-00 - -
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16688 - Cylinder 4 Misfire Detected
P0304 - 35-00 - -
Readiness: 0000 0000

---> Clear DTC codes
---> DTC Output on 09/05/03 (Full module scan but only engine shown)
VAG-COM Version: Release 303.1


Chassis Type: 4B - C5 Audi A6
Scan: 01,02,03,08,15,16,17,35,36,37,45,55,56

Address 01 -------------------------------------------------------
Controller: 4B0 907 551 K
Component: 2.7l V6/5VT G 0005
Coding: 06612
Shop #: WSC 00000
0 Faults Found:

---> DTC Output on 09/08/03 8:00am (Full module scan but only engine shown)
VAG-COM Version: Release 303.1

Control Module Part Number: 4B0 907 551 K
Component and/or Version: 2.7l V6/5VT G 0005
Software Coding: 06612
Work Shop Code: WSC 00000
6 Faults Found:
16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-10 - - - Intermittent
17862 - Exhaust Gas Temp Sensor 1 (G235): Short to Ground
P1454 - 35-10 - - - Intermittent
17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-00 - -
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16688 - Cylinder 4 Misfire Detected
P0304 - 35-10 - - - Intermittent
16520 - Oxygen (Lambda) Sensor B1 S2: Malfunction in Circuit
P0136 - 35-10 - - - Intermittent

---> Clear DTC codes 8:02am
---> DTC Output on 09/08/03 8:08am (Engine module scan only)
VAG-COM Version: Release 303.1

Control Module Part Number: 4B0 907 551 K
Component and/or Version: 2.7l V6/5VT G 0005
Software Coding: 06612
Work Shop Code: WSC 00000
0 Faults Found:

---> DTC Output on 09/08/03 8:10am(Full module scan but only engine shown)
VAG-COM Version: Release 303.1

Control Module Part Number: 4B0 907 551 K
Component and/or Version: 2.7l V6/5VT G 0005
Software Coding: 06612
Work Shop Code: WSC 00000
6 Faults Found:
16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-10 - - - Intermittent
17862 - Exhaust Gas Temp Sensor 1 (G235): Short to Ground
P1454 - 35-10 - - - Intermittent
---> Clear DTC codes 8:11am

---> DTC Output on 09/10/03 8:05am(Full module scan but only engine shown)
VAG-COM Version: Release 303.1

Chassis Type: 4B - C5 Audi A6
Scan: 01,02,03,08,15,16,17,35,36,37,45,55,56

Address 01 -------------------------------------------------------
Controller: 4B0 907 551 K
Component: 2.7l V6/5VT G 0005
Coding: 06612
Shop #: WSC 00000
0 Faults Found:

---> DTC Output on 09/10/03 8:08am(Full module scan but only engine shown)
VAG-COM Version: Release 303.1

Chassis Type: 4B - C5 Audi A6
Scan: 01,02,03,08,15,16,17,35,36,37,45,55,56

Address 01 -------------------------------------------------------
Controller: 4B0 907 551 K
Component: 2.7l V6/5VT G 0005
Coding: 06612
Shop #: WSC 00000
2 Faults Found:
17861 - Exhaust Gas Temp Sensor 1 (G235): Open or Short to Plus
P1453 - 35-10 - - - Intermittent
17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-00 - -
Readiness: 0000 0000

---> Clear DTC codes 8:11am

 

Have you driven the car between these scans?

 

I have not diven the car between scans that happend on the same day. I tested on the 5th, 8th, and 10th. I drove the car between the days. I conducted multiple tests on the same day without driving or even running the motor. The codes would 'reappear' in one testig session.

FYI, I have had some 'flakey' connection issues which could be related to the ability to clear. I have reviewed the FAQ and will take the necessary actions. However, I do not think I can teminate my Office Scan application (corp computer).

 

Which Interface are you using?

 

Duno, I borrowed the cable interface from my friend Tom Leppke-Hennig. I will go look when I get in the car this afternoon. I will also run the following test with the engine off:

1. Scan the engine module
2. Review codes
3. perform auto scan
4. compare codes
5. clear codes in the autoscan module window
6. Repeat steps 1-5 and look for variation

 

Andy:

I checked the interface I am using. It is a registered Ross-Tech DIN interface Rev-B is on the label.

Last night I did some limited testing with my laptop. I followed the FAQ on "flaky" connections (Disabled Virus and Xircom cards). I found that I had much better connections to the ECU. I noticed that the "\" icon is supposed to keep turning, before it was turning intermittently. I believe this may have been causing inconsistent results. In fact I received a whole bunch more faults than I had seen before. Also, I more clearly understand what "Clear Results" means on the Auto scan function. I thought it meant clear the faults, not true.

I want to do some more testing to see if I can replicate the 'Ghost Codes'. So far the results have been very consistent. The auto scan and the individual scans match. I cleared all fault codes for all modules. I have driven the car now and I will review the faults that return, clear them and rescan to see if any ghosts popup.

I did receive a connectivity error on the auto scan. After being connected for about 10 min, the auto scan kept erroring out after scanning the first module (engine). I figured I would disconnect and try later.