Traction Control, EPC and Limp

[A4Ever]

I searched the forum with my symptoms but it appears to be a general state for many problems so I thought I'd post to see what I can find out.

A while ago on my B7 1.8T Quattro the engine light came on, at the time I had a cheap handheld scanner gave me P0222 (Angle Sensor 2 for Throttle (G188): Signal Too Low). Around the same time my Traction Control and EPC lights would come on seemingly randomly and cause me to lose acceleration.

Throttle body replaced, genuine new Bosch part from Germany. Same problem. Mechanic checked all the wiring and said it was perfect so the only thing left was the ECU. Replaced the ECU, still having the same problem. Mechanic said I need to replace the throttle body *again* (?!?!).

After the throttle body was replaced I started to get the oil level sensor warning.

The TC + EPC lights come on when I go over speed bumps or drive on a road with dips. If I turn off the car they go off, then on again at the next bump.

I got a friend to scan the car and I got these results:

-------------------------------------------------------------------------------
Address 01: Engine Labels: 06B-906-018-AVJ.lbl
Part No SW: 8E0 909 518 AL HW: 8E0 909 018 A
Component: 1.8L R4/5VT 0003
Coding: 0011501
Shop #: WSC 63251 000 00000
VCID: 7A1E2267F5D00AC28BFA17-515E

1 Fault Found:
17580 - Angle Sensor 2 for Throttle Actuator (G188) Signal too Low
P1172 - 002 -
Readiness: 0000 1100
-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8E0-910-517.clb
Part No SW: 8E0 910 517 C HW: 8E0 614 517 BB
Component: ESP8 quattro H04 0180
Revision: 00000000 Serial number: 00000000000000
Coding: 0004871
Shop #: WSC 06435 000 00000
VCID: 27B82B1356E2442AA4B4E6-8072

2 Faults Found:
01314 - Engine Control Module
013 - Check DTC Memory
Freeze Frame:
Fault Status: 01101101
Fault Priority: 2
Fault Frequency: 78
Reset counter: 40
Time Indication: 0

Freeze Frame:
Hex Value: 0x0D00
Hex Value: 0x4002
Hex Value: 0x00FF
Hex Value: 0xFFA7
Hex Value: 0x00FF

00532 - Supply Voltage B+
000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 2
Fault Frequency: 1
Reset counter: 39
Time Indication: 0

Freeze Frame:
Hex Value: 0x2B00
Hex Value: 0x7302
Hex Value: 0x00FF
Hex Value: 0xFFA6
Hex Value: 0x00FF
-------------------------------------------------------------------------------
Address 17: Instruments Labels: 8E0-920-9xx-8EC.lbl
Part No SW: 8E0 920 900 Q HW: 8E0 920 900 Q
Component: KOMBI+WFS 3 H12 0030
Revision: 0030 Serial number: AUX6Z0E0041423
Coding: 0007141
Shop #: WSC 80093 222 69422
VCID: 328ECA476D20328203CA7F-515E

3 Faults Found:
00562 - Sensor for Oil Level/Temperature (G266)
010 - Open or Short to Plus
00562 - Sensor for Oil Level/Temperature (G266)
007 - Short to Ground
00562 - Sensor for Oil Level/Temperature (G266)
008 - Implausible Signal
Address 25: Immobilizer Labels: 8E0-920-9xx-8EC.lbl
Part No SW: 8E0 920 900 Q HW: 8E0 920 900 Q
Component: KOMBI+WFS 3 H12 0030
Revision: 0030 Serial number: AUX6Z0E0041423
Coding: 0007141
Shop #: WSC 80093 222 69422
VCID: 328ECA476D20328203CA7F-515E

3 Faults Found:
00562 - Sensor for Oil Level/Temperature (G266)
010 - Open or Short to Plus
00562 - Sensor for Oil Level/Temperature (G266)
007 - Short to Ground
00562 - Sensor for Oil Level/Temperature (G266)
008 - Implausible Signal
-------------------------------------------------------------------------------
Address 56: Radio Labels: 8E0-035-1xx-56.lbl
Part No: 8E0 035 186 D
Component: concert II GRO 0004
Coding: 01001
Shop #: WSC 06435
VCID: 28BA282F5BFC1852ADAEED-4B00

1 Fault Found:
00858 - Connection; Radio Intermediate Frequency (IF) Output to Antenna Amplifier
36-10 - Open Circuit - Intermittent

Any thoughts or advice greatly appreciated before I spend more money and experience more grief!

Thanks,

--Liam.

 

[tut_gareth]

Have you looked at the throttle pedal unit itself ?
I'd also be checking all earthing points to make sure they are tight.
If it happens over bumps I'd think something is loose somewhere..

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[A4Ever]

Hi Gareth,

Thanks for the reply. My electrics guy said he checked all the wiring and it's perfect. I've ordered an oil level sensor to replace that as it's being flagged. I'm hoping the loose wire and the oil sensor are at least related if not the same thing.

I checked the pedal in VCDS just there at lunch and the values I'm seeing for it are:

G79: 14.5% to 80.9%
G185: 7.0% to 40.6%

Is that normal? It seems to be missing the top and bottom 20% or so.

--Liam.

 

[tut_gareth]

Can't say for sure what the reading should be but there appears to be a good range so I say it's working. Has the electrics guy done a continuity check on the related wiring harness to rule out possible breakages?
Have you checked the ecu connector?

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[A4Ever]

Yea after replacing the throttle body and the problem persisted he checked all the wiring into the ECU which is why he thought it was the ECU that was at fault and replaced that, same problem.

I'm kind of grasping at straws that someone on here will have had my exact problem, or there's some detail I missed. The idea of getting another throttle body doesn't make sense to me...

--Liam.

 

[tut_gareth]

Sorry your not having much luck. Not sure what else to suggest. Another tb might fix it but like you say it's clutching at straws really. Have you googled the fault codes to see if anyone has had similar problems on other sites?

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[A4Ever]

Just to close off this thread, the car has been running normally for the last 6 days.

Sorry for the lack of details it was hard to understand the guy who worked on my car. Hopefully it will give someone else some options.

Turns out there was a connector "behind the engine" that was really tight at an angle and a clip was digging into the wires, it seems this was dragging down the voltage and causing the car to register low voltage on the throttle body. Two throttle bodies, one ECU and double digit trips to the mechanic later... :/

Anyway, end result is I have my car back and it feels like a new car, ready to pounce and eager to go so I'm happy

--Liam.