Frequently Asked Questions and Common Problems Thread Collection
Junior Member
Joined: May 2004
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TT user guide when you're told to RTFM and don't have one
Almost as good as a manual.<ul><li><a href="http://www.audiusa.com/common/myaudiManualsPdf/myaudiQRG_TT_Coupe_2004_en.pdf">TT user guide (PDF)</a></li></ul>
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Joined: Dec 2000
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Battery voltage guide......>
I've had this gauge sitting on my desk for weeks now. It'a a precision Voltage gauge used on boats. The percent charge info is good and will reflect battery health. To determine true "resting" voltage, unhook you neg terminal, let set overnight, and test in the morning with a digital gauge. Temps should be in the 60-80 degree range for this to be an accurate assessment. Cooler temps=lower voltages. Audi's voltage spec is >12.5V
<img src="http://images16.fotki.com/v271/photos/7/7305/776256/DSC04647-vi.jpg">
<img src="http://images16.fotki.com/v271/photos/7/7305/776256/DSC04647-vi.jpg">
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Haldex diagnostics and function testing....
First run a VAG-COM diagnostic on the AWD system. A bad controller or connection issue will likely show up here
Mechanical Function-test of the Haldex coupling.
- Rollout in circle
Aim: Check the function of the coupling and the response on the car. Is to be done on level ground.
1. Drive in circle with minimum turning radius at a speed of about 10 km/h.
Disengage the clutch and close the throttle.
Let the car roll to full stop.
2. Drive in circle with minimum turning radius at same speed as in case 1.
Disengage the clutch and run up the engine to 3000 - 4000 rpm.
Let the car roll to full stop.
* If the coupling is working the car will stop in about half the distance in case 2 compared with case 1.
* If there is no difference in the two cases there is a malfunction of the coupling. The problem could be caused by the coupling or by missing signals from the car. A further inspection has to be done to be able to determine the cause of the malfunction.
* If a noise from the HLSC is noticed when turning or driving in circles the oil in the coupling is damaged. The damage can be caused by overheating or by water in the oil.
- AWD test on car lift. (all wheels free to turn.)
Aim: Check the function and the control of the coupling.
1. Pull the handbrake.
Disengage the clutch.
Start the engine.
Put the gearbox in 2:nd gear.
Let the engine idle.
Engage the clutch.
* Engine is supposed to stop when the clutch is engaged. (HLSC controlled as in handbrake start.) If engine do not stop, disengage the hand brake immediately. Otherwise there is a risk of seriously damage on the HLSC.
2. Disengage the handbrake.
Disengage the clutch and start the engine
Put the gearbox in 2:nd gear.
Let the engine idle.
Engage the clutch. At least one front wheel and one rear wheel is supposed to turn.
Pull the handbrake for 2 seconds.
* Front wheel is supposed to turn while the rear wheels are supposed to stop when the brake is pulled. Engine is supposed to run all the time. (HLSC controlled as in handbrake turn.) Don't exceed the 2 seconds or repeat the test for more than 5 times during a 5-minute period. Otherwise there is a risk of seriously damage on the HLSC.
Trouble shooting on HLSC
- Visual inspection
Aim: Check for leakage and external damage that affects the function on the HLSC. Is to be done with the car on a car lift.
1. Check for oil-leakage from the coupling. If leakage is found, check oil level at the level screw on the left side of the coupling.
2. Check wires and connecting sockets.
T8 - Socket between car and control unit
T8/1, Red = Ign.
T8/2, Black = Gnd.
T8/3, White = BLS
T8/4, Blue = HBLS
T8/5, Brown = K-line
T8/7, Blue/Grey = CAN low
T8/8, Blue/Orange = CAN high
T2 - Socket between control unit and feeder pump
T2/1, Yellow = Pump 1
T2/2, Yellow/Black = Pump 2
- Signals
Aim: The following signals from the car affect the function of the HLSC. If one or more of the signals is missing or false the function of the HLSC will be reduced.
Bremse 1; BLS, BTS, ABS
Bremse 3; VR, VL, HR, HL
Mechanical Function-test of the Haldex coupling.
- Rollout in circle
Aim: Check the function of the coupling and the response on the car. Is to be done on level ground.
1. Drive in circle with minimum turning radius at a speed of about 10 km/h.
Disengage the clutch and close the throttle.
Let the car roll to full stop.
2. Drive in circle with minimum turning radius at same speed as in case 1.
Disengage the clutch and run up the engine to 3000 - 4000 rpm.
Let the car roll to full stop.
* If the coupling is working the car will stop in about half the distance in case 2 compared with case 1.
* If there is no difference in the two cases there is a malfunction of the coupling. The problem could be caused by the coupling or by missing signals from the car. A further inspection has to be done to be able to determine the cause of the malfunction.
* If a noise from the HLSC is noticed when turning or driving in circles the oil in the coupling is damaged. The damage can be caused by overheating or by water in the oil.
- AWD test on car lift. (all wheels free to turn.)
Aim: Check the function and the control of the coupling.
1. Pull the handbrake.
Disengage the clutch.
Start the engine.
Put the gearbox in 2:nd gear.
Let the engine idle.
Engage the clutch.
* Engine is supposed to stop when the clutch is engaged. (HLSC controlled as in handbrake start.) If engine do not stop, disengage the hand brake immediately. Otherwise there is a risk of seriously damage on the HLSC.
2. Disengage the handbrake.
Disengage the clutch and start the engine
Put the gearbox in 2:nd gear.
Let the engine idle.
Engage the clutch. At least one front wheel and one rear wheel is supposed to turn.
Pull the handbrake for 2 seconds.
* Front wheel is supposed to turn while the rear wheels are supposed to stop when the brake is pulled. Engine is supposed to run all the time. (HLSC controlled as in handbrake turn.) Don't exceed the 2 seconds or repeat the test for more than 5 times during a 5-minute period. Otherwise there is a risk of seriously damage on the HLSC.
Trouble shooting on HLSC
- Visual inspection
Aim: Check for leakage and external damage that affects the function on the HLSC. Is to be done with the car on a car lift.
1. Check for oil-leakage from the coupling. If leakage is found, check oil level at the level screw on the left side of the coupling.
2. Check wires and connecting sockets.
T8 - Socket between car and control unit
T8/1, Red = Ign.
T8/2, Black = Gnd.
T8/3, White = BLS
T8/4, Blue = HBLS
T8/5, Brown = K-line
T8/7, Blue/Grey = CAN low
T8/8, Blue/Orange = CAN high
T2 - Socket between control unit and feeder pump
T2/1, Yellow = Pump 1
T2/2, Yellow/Black = Pump 2
- Signals
Aim: The following signals from the car affect the function of the HLSC. If one or more of the signals is missing or false the function of the HLSC will be reduced.
Bremse 1; BLS, BTS, ABS
Bremse 3; VR, VL, HR, HL
Last edited by TTschwing; Sep 8, 2009 at 07:01 AM.
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Chassis tuning (oversteer/Understeer chart)....
<ul><li><a href="http://www.rogerkrausracing.net/Under_Steer_Over_Steer_.html">http://www.rogerkrausracing.net/Under_Steer_Over_Steer_.html</a</li></ul>
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Joined: May 2001
Posts: 4,474
Likes: 3
From: Noblesville, Indiana
Concert radio programming, Mega Bass, Entering anti-theft code, etc.
<center><img src="http://www.ibiblio.org/tkan/audi/radios/concert.jpg"></center><p>Click link for how to:
Entering anti-theft code
Radio Frequency and Reception Quality Information
Speed-sensitive Volume Control (GALA) Information
CD Changer Detection
Other Preferences & Configurable Options
Standard/Bose and other configuration modes
Mega Bass:
The Concert radio can be coded for two different Bass/Treble Vehicle-specific tone control slopes. One is for Bose/Concert and the other for Concert only. You can change this setting by recoding the radio module with either a VAG1151/1552 or VWTOOL.
The standard coding for a TT w/bose and secondary display is 00517. If you don't have a cd changer, secondary display, etc. this value may vary in the first decimal place (see page 5 of audi tech document on adding a CD-Changer for complete details. URL at end).
We are only concerned with the value at the second decimal place (in the example above it is 1 for Bose tone slope). If you have the radio recoded and change the 1 to a 0 (zero), you will enable the other Vehicle-specific tone control.
Once the radio is recoded you will notice the "Bose" missing from the display on powerup. The Bass/Treble range is now +-6 but the adjustment is more dramatic.
I must say, the effect on the Bass is incredible! It may not be a "true" sound in the Bose universe but many will find it an improvement.<ul><li><a href="http://www.ibiblio.org/tkan/audi/radios/concert.html">Ti Kan: Audi Concert Radio Programming</a></li></ul>
Entering anti-theft code
Radio Frequency and Reception Quality Information
Speed-sensitive Volume Control (GALA) Information
CD Changer Detection
Other Preferences & Configurable Options
Standard/Bose and other configuration modes
Mega Bass:
The Concert radio can be coded for two different Bass/Treble Vehicle-specific tone control slopes. One is for Bose/Concert and the other for Concert only. You can change this setting by recoding the radio module with either a VAG1151/1552 or VWTOOL.
The standard coding for a TT w/bose and secondary display is 00517. If you don't have a cd changer, secondary display, etc. this value may vary in the first decimal place (see page 5 of audi tech document on adding a CD-Changer for complete details. URL at end).
We are only concerned with the value at the second decimal place (in the example above it is 1 for Bose tone slope). If you have the radio recoded and change the 1 to a 0 (zero), you will enable the other Vehicle-specific tone control.
Once the radio is recoded you will notice the "Bose" missing from the display on powerup. The Bass/Treble range is now +-6 but the adjustment is more dramatic.
I must say, the effect on the Bass is incredible! It may not be a "true" sound in the Bose universe but many will find it an improvement.<ul><li><a href="http://www.ibiblio.org/tkan/audi/radios/concert.html">Ti Kan: Audi Concert Radio Programming</a></li></ul>
AudiWorld Super User
Joined: May 2001
Posts: 4,474
Likes: 3
From: Noblesville, Indiana
Concert II Radio Programming link:
<center><img src="http://www.ibiblio.org/tkan/audi/radios/_concert2.jpg"></center><p><ul><li><a href="http://www.ibiblio.org/tkan/audi/radios/concert2.html">http://www.ibiblio.org/tkan/audi/radios/concert2.html</a</li></ul>