2005 Audi TT No accelerator response

[goof111]

I have a 2005 Audi tt that there is no response to the pedal. It starts and runs good at idle but when you push the pedal down it will not accelerate. Could someone help me as to what needs to be fixed?

Chassis Type: 8N (8N - Audi TT (1999 > 2007))
Scan: 01 02 03 08 15 17 22 35 37 45 55 56 76 77

VIN: TRUTC28N551007226  
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Address 01: Engine        Labels: 06A-906-032-AWP.lbl
Part No: 8N0 906 018 CM
Component: 1.8L R4/5VT     G   0010 
Coding: 07570
Shop #: WSC 01236 
VCID: 7EA227D989E70B5AFDB-5160
TRUTC28N551007226     AUZ5Z0D6296012

6 Faults Found:
18039 - Accelerator Position Sensor (G79)
P1631 - 35-00 - Signal too High
18042 - Accelerator Position Sensor 2 (G185)
P1634 - 35-00 - Signal too High
17987 - Throttle Actuator (J338)
P1579 - 35-10 - Adaptation Not Started - Intermittent
18032 - MIL Request Signal Active (Check TCM for errors too!)
P1624 - 35-00 -
17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
P1297 - 35-00 -
16522 - Oxygen (Lambda) Sensor B1 S2
P0138 - 35-00 - Signal too High
Readiness: 0110 1101

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Address 02: Auto Trans        Labels: 09G-927-750.clb
Part No: 09G 927 750 AQ
Component: AQ 250 6F           0544 
Coding: 0008201
Shop #: WSC 01236 785 00200
VCID: 005E5921F6137DAA8F7-5160

2 Faults Found:
00777 - Accelerator Position Sensor (G79)
013 - Check DTC Memory - MIL ON
01314 - Engine Control Module
013 - Check DTC Memory - Intermittent

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Address 03: ABS Brakes        Labels: 8N0-907-379-MK60-F.lbl
Part No: 8N0 907 379 J
Component: ESP FRONT MK60      0101 
Coding: 0019473
Shop #: WSC 01236 785 00200
VCID: 43D4962DA785A6B2D25-5160

3 Faults Found:
01314 - Engine Control Module
013 - Check DTC Memory - Intermittent
00810 - Sensor 1/2 for Brake Pressure
008 - Implausible Signal - Intermittent
01435 - Brake Pressure Sensor 1 (G201)
008 - Implausible Signal

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Address 15: Airbags        Labels: 8N0-959-655.lbl
Part No: 8N0 959 655 D
Component: Airbag Front+Seite 1000 
Coding: 01103
Shop #: WSC 01236 
VCID: 41D89C25B899B4A2C09-516C

No fault code found.

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Address 17: Instruments        Labels: 8Nx-920-xxx-17.lbl
Part No: 8N1 920 980 E
Component: KOMBI+WEGFAHRS. M73 D07 
Coding: 20244
Shop #: WSC 00222 
VCID: 382EF1C1EB43F56A777-4B1E
TRUTC28N551007226     AUZ5Z0D6296012

4 Faults Found:
00779 - Outside Air Temp Sensor (G17)
30-00 - Open or Short to Plus
01179 - Incorrect Key Programming
35-00 - -
01304 - Radio
49-00 - No Communications
01305 - Databus for Infotainment
37-00 - Faulty

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Address 35: Centr. Locks        Labels:. 8Nx-962-267.clb
Part No: 8N7 962 267 F
Component: Central Lock/Alarm  D09 
Coding: 15900
Shop #: WSC 07439 
VCID: 43D4962DA285A6B2D25-4EDE

No fault code found.

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Address 55: Headlight Range        Labels: 4B0-907-357-AUT.lbl
Part No: 4B0 907 357
Component: LEUCHTWEITEREGLER  D004 
Coding: 00009
Shop #: WSC 01236 
VCID: 659068B50C71B8821C1-51AC

No fault code found.

End----------(Elapsed Time: 02:59, VBatt start/end: 12.4V/12.4V)-----------
------------------------------15 Faults Found------------------------------

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Address 0x01,8N0 906 018 CM,Basic Settings,Group 060

 

[Uwe]

The "Oxygen Sensor B1 S2 - Signal too High" fault code is probably the key to this. My guess is the signal wire back to the ECU is shorted to some source of +12V, quite possibly the +12V supply to the heater in that sensor.

Trouble is once you find and fix whatever is causing that, you may discover that that you still have no pedal response. Why? Because on those ME7 ECUs, the signals from the oxygen sensors and the signals from the accelerator pedal were connected to the same analog-to-digital "chip" (may have been a portion of a bigger chip) that was only rated for 5V inputs, and putting 12V into it causes permanent damage.

Anyway, start by carefully going through the wiring to the oxygen sensors. Do not, under any circumstances, connect a different ECU to this car until you're 110% certain that you aren't feeding 12V back into one of those signal inputs.

-Uwe-

 

[vwtech]

As Uwe said.
Bad design heater circuit to O2 sensors short and kill the ECU pedal controls in ECU.
Usually this is from shitty exhaust installs where O2 wires short out.
New or used ECU is the fix. But also as Uwe said don't install one till you fix the short! Or you'll kill new ECU.
ECU still works car runs, you can still communicate with ECU using VCDS just no throttle control.
Inspect O2 wiring and if found bad fix it first. Also a damn good idea to install a fuse for O2 heater circuits so it never happens again.
This seem more common on the 1.8T then others? Seen a few and fixed a few back in the day.
There are other issues that can cause this also but sure sound like this is your issue.

Good Luck