Engine, ABS and Transmission Codes

[Goran]

Hopefully someone more knowledgeable will be along.
In the meantime I can suggest the following:

MAF - To test your MAF, log it at idle. I have attached the factory test procedure.

Lambda series 1 - intermittent, I think Ainarssems said its only the heating element going out when it says "internal resistance too high"

Lambda series 2 - they only monitor the cats, sounds like heating is dead on those, but maybe they work ok once the exhaust warms them up? They will trigger the CEL in the dash though

Fuel trim - could be from bad MAF

Here are some ElsaWin factory test procedures for MAF, Lambdas, and Brake Light switch. If you can best check for yourself if these components are operating to spec.

[steamship]

Originally Posted by Goran

Hopefully someone more knowledgeable will be along.
In the meantime I can suggest the following:

MAF - To test your MAF, log it at idle. I have attached the factory test procedure.

Lambda series 1 - intermittent, I think Ainarssems said its only the heating element going out when it says "internal resistance too high"

Lambda series 2 - they only monitor the cats, sounds like heating is dead on those, but maybe they work ok once the exhaust warms them up? They will trigger the CEL in the dash though

Fuel trim - could be from bad MAF

Here are some ElsaWin factory test procedures for MAF, Lambdas, and Brake Light switch. If you can best check for yourself if these components are operating to spec.

Thanks for the PDFs. Some light reading for me tonight.

[steamship]

Originally Posted by Goran

Hopefully someone more knowledgeable will be along.
In the meantime I can suggest the following:

MAF - To test your MAF, log it at idle. I have attached the factory test procedure.

Lambda series 1 - intermittent, I think Ainarssems said its only the heating element going out when it says "internal resistance too high"

Lambda series 2 - they only monitor the cats, sounds like heating is dead on those, but maybe they work ok once the exhaust warms them up? They will trigger the CEL in the dash though

Fuel trim - could be from bad MAF

Here are some ElsaWin factory test procedures for MAF, Lambdas, and Brake Light switch. If you can best check for yourself if these components are operating to spec.

So, after a 50 mile run yesterday, I connected up the laptop and went through the various tests.

- Brake switch is fine (but still throwing that weird error).
- First MAF test was returning 26.3% on Load and 0.00g/s on Air Mass. Changed it to the old one again and reran the test. This time was returning 15.8% Load and 3.97-5.61g/s Air Mass, within the specified range.
- Lambda heating (measuring block 41) returned 0.3, S1 on, 0.1 and S2 on. Block 42 returned 0.1, S1 on, 0.1 and S2 on. The only odd thing I noticed was that on block 41, S2 was flicking between On and Off for several minutes before finally settling to On.
- Lambda upstream (measuring block 30) returned 111, 110, 111 and 100. Block 33 returned (-4.7 to -9.4), (0.085 to 0.715), (-4.7 to 0.0) and (0.065 to 0.72).
- Lambda downstream - didn't do this one as wasn't 100% sure on what to do.

I was out again today for around 60 mile, and what surprised me was that for about the first 20-25 mile, I didn't have the ABS and Traction Control lit on the dash. The car behaved as normal with no signs of hesitation or stalling. Then for some reason, the lights came on and stayed on, with the consequence of having the car stall twice at junctions.

On one of the documents, it says to 'Check intake system for leaks and rectify unmetered air'. Exactly what should I be checking here? Would this include the likes of the small vacuum hoses criss-crossing the engine? Just wondering as one of the hoses that runs along the top of the right hand side of the engine starts as a braided hose at the back, changes to a smaller diameter hose pushed inside the braided hose, and then back to the braided hose at the front, again with the smaller hose just pushed inside it.

[SilverS8]

A cheap fix just to eliminate false air, change all visible vacum lines and also run over the whole bay with "Start gas" when engine is idling to see if there is any leaks.

Jan

[steamship]

Originally Posted by SilverS8

A cheap fix just to eliminate false air, change all visible vacum lines and also run over the whole bay with "Start gas" when engine is idling to see if there is any leaks.

Jan

Never heard of 'Start gas' but a quick search on Google returned an interesting video from EricTheCarGuy, so will have a look at that. Thanks.

[SilverS8]

Not sure what its called at you end.. Its a regulat soray can bought in any Automotive store that is used to spray into carborators or injection system. Car will run on this stuff for. a short while.

When used to check for leaks you will have an increase in rpm when sprayed on the leak.

Starter fluid might be the english description

http://en.m.wikipedia.org/wiki/Starting_fluid

[steamship]

Originally Posted by SilverS8

Not sure what its called at you end.. Its a regulat soray can bought in any Automotive store that is used to spray into carborators or injection system. Car will run on this stuff for. a short while.

When used to check for leaks you will have an increase in rpm when sprayed on the leak.

Starter fluid might the english description

http://en.m.wikipedia.org/wiki/Starting_fluid

Equivalent over here would be something like 'Easy Start'. Luckily, I have some outside.

[steamship]

So, after running the MAF tests that Goran posted last week, I ordered up another new MAF sensor (since the one I bought was DOA). I fitted the new one the other day, cleared all the codes and reran the MAF test. This one is showing values that are within spec. Was out for a 90 mile run yesterday, and for the first 30, neither ABS or traction control lights were on. Had a couple of stops along the way, and each time the lights were out initially and would then come on. The car felt more responsive than it has been recently, and was even nice to drive, compared to driving it on other days - no stalls and no thumps going into Drive.

Ran a scan today and the MAF error has disappeared. So too has the Brake switch one, despite me not touching it. I'm still getting the following though:

-------------------------------------------------------------------------------
Address 01: Engine Labels: None
Part No: 4D0 907 558 AB
Component: 3.7L V8/5V G 0002
Coding: 11753
Shop #: WSC 23143
VCID: 6DDBD76D278ADF1
WAUZZZ4D92N002072 AUZ7Z0A1855153

7 Faults Found:
17530 - Oxygen (Lambda) Sensor Heating; B2 S2
P1122 - 35-00 - Open Circuit
17548 - Oxygen (Lambda) Sensor; B2 S2
P1140 - 35-00 - Internal Resistance too High
17831 - Secondary Air Injection System; Bank 1
P1423 - 35-00 - Insufficient Flow
17819 - Secondary Air Injection System; Bank 2
P1411 - 35-00 - Insufficient Flow
17521 - Oxygen (Lambda) Sensor; B1 S1
P1113 - 35-10 - Internal Resistance too High - Intermittent
17537 - Fuel Trim; Bank 2 (Mult)
P1129 - 35-10 - System too Rich - Intermittent
17535 - Fuel Trim; Bank 1 (Mult)
P1127 - 35-10 - System too Rich - Intermittent
Readiness: 0010 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01V-927-156.lbl
Part No: 4D0 927 156 DT
Component: AG5 01V 3.7l5V RdW 1920
Coding: 00001
Shop #: WSC 00000
VCID: 7EF9E0217AEC549

1 Fault Found:
18265 - Load Signal
P1857 - 35-10 - Error Message from ECU - Intermittent

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8D0-907-389.lbl
Part No: 4D0 907 389 E
Component: ABS/ESP allrad D56
Coding: 08397
Shop #: WSC 02313
VCID: 31630B1DFB327B1

2 Faults Found:
01464 - Brake Pressure/lateral Acceleration Sensor
48-10 - Supply Voltage - Intermittent
18265 - Load Signal
P1857 - 35-10 - Error Message from ECU - Intermittent

-------------------------------------------------------------------------------

I'm seriously considering taking the car to my local Audi dealership (64 miles away, local) to see if they can figure out why there are so many Intermittent errors. I also get them in 17: Instruments, 37:Navigation and 56:Radio, but they are intermittent as well, and don't annoy me as they don't appear to have any side effects. Since I'm coming over to the annual meet, I would like the car to be running properly.