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Wilco
02-19-2007, 12:35 AM
So I'm driving down the freeway and after about an hour of driving my CEL starts flashing and my engine dies. I pulled off to the shoulder and let the engine cool and tried to start it again to no avail.

After getting it towed home, I VAG'ed it and got 17 fault codes! Ok so the first 2 are just sensors that have been nagging me for the past month, but the other 15 are new.

Here they are - any ideas?



VAG-COM Version: Release 409.1-US

Control Module Part Number: 4D0 907 551 AH
Component and/or Version: 2.8L V6/5V MOTR HS D01
Software Coding: 06201
Work Shop Code: WSC 06435
17 Faults Found:
16716 - Knock Sensor 2 (G66): Signal too Low
P0332 - 35-10 - - - Intermittent
16544 - Oxygen (Lambda) Sensor B2 S2: No Activity
P0160 - 35-00 - -
17746 - Camshaft Position Sensor (G40) Open or Short to Plus
P1338 - 35-00 - -
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16685 - Cylinder 1 Misfire Detected
P0301 - 35-00 - -
16687 - Cylinder 3 Misfire Detected
P0303 - 35-00 - -
16686 - Cylinder 2 Misfire Detected
P0302 - 35-00 - -
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16685 - Cylinder 1 Misfire Detected
P0301 - 35-00 - -
16687 - Cylinder 3 Misfire Detected
P0303 - 35-00 - -
16686 - Cylinder 2 Misfire Detected
P0302 - 35-00 - -
17800 - Camshaft Position Sensor Bank 2 (G163): Open Short to Plus
P1392 - 35-00 - -
17841 - Secondary Air Pump Relay (J299): Open Circuit
P1433 - 35-00 - -
17840 - Secondary Air Injection Solenoid Valve (N112): Open Circuit
P1432 - 35-00 - -
17834 - EVAP Purge Valve (N80): Open Circuit
P1426 - 35-00 - -
17924 - Intake Manifold Valve (N156): Open Circuit
P1516 - 35-00 - -
17881 - EVAP Leak Detection Pump: Open Circuit
P1473 - 35-00 - -


[=(] [=(] [=(]

Ado
02-19-2007, 12:47 AM
the misfire might be due to a part that sits on your intake box.

ok i just found out that its called "Ignition Control Unit" lol. duh. stupid me.
i just found them on ecs tuning.

http://www.ecstuning.com/stage/edpd/pagebuild_v2.cgi?make=Audi&engine=1.8T&model=B5%20A4&submodel=FWD&category=Engine


hope this helps.

Wilco
02-19-2007, 01:05 AM
Interesting - thanks for the heads up. Think it might just be a loose connection, or is it more likely that something needs to be replaced?

I know it's hard to tell this via a forum, but any ideas are welcome!

Ado
02-19-2007, 01:10 AM
not a probelm. hope you get that fixed soon. it sucks not having a car. but i think that ignition control units is whats wrong.

superman_006
02-19-2007, 09:13 AM
Have you ever un-pluged any of this sensors, trying to find a problem? I have seen mechanics do that before. I would clear the codes then crank it again and see if most of the "short or open circuts" come back. If they do I would be looking at your engine grounds and the wriring harness grounds.

pipe7284
02-19-2007, 09:37 AM
dude,get a new engine!!!!!...lol....j/k
damn that sucks. and i thought i was the only one in multiple code.
good luck with the problems!!!!

Wilco
02-19-2007, 01:39 PM
Thanks for the help - it's definitely reassuring to know that it is probably an electrical issue (my first guess).

I'm gonna mess around with it today before I have the shop look at it tomorrow. I'd prefer to fix it myself, but time may win out, and I don't want to take the bus to work [headbang].

Wilco
02-19-2007, 01:45 PM
Ooh nice, found an ignition control module on ebay for $60. Might just order it to try since it's cheap (cheaper than the $140-$240 at ECS).

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=120088643249

EDIT: Is there a diagram in the Bentley manual where this thing is located?

superman_006
02-19-2007, 02:13 PM
Ive got one for a 2002 A4 in pdf, it may or maynot help you, Let me know if you want to see it
but the more I think about it, it has got to be a loose/ broken ground or a harness plug came undone. If your Ing module went out, you would only have the miss-fire codes. If a ground game loose or a ground broke.... every sensor on that ground leg would throw a code, You can just unplug any of the sensors that through the code and see if there is ground (-) on any of the brown wire on each by hooking a 12vlt test light to the (+)pos post on the battery
If there the light doesnt come on when connected to the brown wire, leave it connected and follow the harnes back, and wiggle the harness unless you find a broken wire or a loose ground bolt.

ProOnThaSnow
02-19-2007, 02:45 PM
Wow, I wonder what the record for most un-intentional Fault Codes is, cuz yours has to rank right the fuck up there!

And yeah, with all the open circuits it definately would make me look at engine grounds first. I hated electrical diagnostics when I was a mechanic... now I sit in an office all day, and play on the internet!

superman_006
02-19-2007, 03:00 PM
I seen 27 once, this guy was tring to figure out what was wrong with his car and unpluged every sensor 1 by 1 to see if it would run better, I though it was needing a ECU because he didnt tell me that he had done that, but when I reset it only one code came back, when I told him about all the codes he told me about his little experiment.

Wilco
02-19-2007, 03:09 PM
Haha, wow that is nuts!

But yeah, seeing that a couple of the codes seem completely unrelated (other than maybe their ground connection) it seems more likely that it's a ground issue. Unless the universe just ripped in half and all these problems just coincidentally happened at once!

I did pull and reattach each plug related to those codes with no result, so it's not a loose plug, looks like a bad ground FTW! (maybe)

Wilco
02-19-2007, 03:11 PM
Update: I cleared the codes and tried to start her up again, and it's only throwing 5 codes now. I either fixed something by checking the connectors, or it's just that the engine cant get going to throw the other codes.

ProOnThaSnow
02-19-2007, 03:13 PM
27 is nuts, but I was saying the unintended record... cuz 17 seems like a fuggin lot!

superman_006
02-19-2007, 03:32 PM
Well if the ground fails for ....lets say the camshaft sensor, thus not sending a signal to the ECU, causing a cyldr mis-fire,


Another example
Such as if your MAF sensor fails it will throw a "MAF out of range code" .... and it will though other codes such as O2 senor 1 lean, random cyl miss fire, cyl 1 miss fire
It would throw the other codes too eventhough the MAF would be your only problem

All your codes are open circut except the cyl misfires, which would happen if you disabled your Camshaft Position Sensor, Camshaft Position Sensor Bank 2, Secondary Air Pump Relay , Secondary Air Injection Solenoid Valve, EVAP Purge Valve, Intake Manifold Valve, and EVAP Leak Detection Pump which all showed "open circut" codes
You may have to replace your O2 sensor on bank 2 (after-cat) and your knock sensor code sounds like a open circut problem

If you need the pfd file of a wiring diagram let me know a email address to send it to

mike-2ptzero
02-19-2007, 06:55 PM
Update: I cleared the codes and tried to start her up again, and it's only throwing 5 codes now. I either fixed something by checking the connectors, or it's just that the engine cant get going to throw the other codes.

What codes are you getting now?

Did you check all of the fuses?

Daft
02-19-2007, 07:05 PM
Update: I cleared the codes and tried to start her up again, and it's only throwing 5 codes now.


What are the five that remain? This will help expose the reason for your breakdown.

superman_006
02-19-2007, 07:13 PM
Has anyone had problems with the O2 wires melting together on the 2.8?

Wilco
02-19-2007, 09:13 PM
Oooh yeah, I forgot to post the codes that are left! I did check the fuses which all appeared to be fine (though I know sometimes fried fuses can appear ok). Ok, here are the remaining codes:



5 Faults Found:

17841 - Secondary Air Pump Relay (J299): Open Circuit
P1433 - 35-00 - -

17840 - Secondary Air Injection Solenoid Valve (N112): Open Circuit
P1432 - 35-00 - -

17834 - EVAP Purge Valve (N80): Open Circuit
P1426 - 35-00 - -

17924 - Intake Manifold Valve (N156): Open Circuit
P1516 - 35-00 - -

17881 - EVAP Leak Detection Pump: Open Circuit
P1473 - 35-00 - -

Wilco
02-19-2007, 09:14 PM
I see they are all open circuits, which seems to all but guarantee its a grounding issue. I'll admit I'm not very experienced with these things, so I'll take as many second opinions as I can get.

superman_006
02-19-2007, 09:17 PM
Sorry that you did like my opion................ J/K

Wilco
02-19-2007, 09:38 PM
Any idea where these particular sensors are grounded? I'm gonna run up the street and test their ground pins (it's parked in front of the shop I have looking at it tomorrow, 2 blocks away - living downtown is finally redeeming itself!).

If they fail the test, I'm not entirely sure where the other end is going to be (damn 2.8 gives me almost no room to do anything without dismantling something).

Wilco
02-19-2007, 11:07 PM
Ummm, this doesn't look good - don't think it's related to my current problems, but maybe I caught something that would have caused many many more problems: http://www.audizine.com/forum/showthread.php?t=120676

mike-2ptzero
02-20-2007, 06:47 AM
Oooh yeah, I forgot to post the codes that are left! I did check the fuses which all appeared to be fine (though I know sometimes fried fuses can appear ok). Ok, here are the remaining codes:

Those usually mean there is a fuse that is blown and most of the time that fuse only gets power while the engine is running. Just start the car and use a test light to test each fuse to make sure it has power on both sides.

ProOnThaSnow
02-20-2007, 10:38 AM
REPLACE THAT T-BELT NOW!!!

Hopefully it didn't jump teeth and take out some valves or anything... hope the best for you man.