selfproclaimedv8buff

After doing a test fire with the clutch not bled and exhaust off, I removed the battery, coincidentally the positive and negative terminals touched. I buttoned everything thing up and now no start. Pulled 8 codes The car is a plethora of problems to begin with but what would cause a no-start?

8 Faults Found:

18058 - Powertrain Data Bus: Missing Message from Instrument Cluster

P1650 - 35-10 - - - Intermittent

18057 - Powertrain Data Bus: Missing Message from ABS Controller

P1649 - 35-10 - - - Intermittent

16795 - Secondary Air Injection System: Incorrect Flow Detected

P0411 - 35-10 - - - Intermittent

17978 - Engine Start Blocked by Immobilizer

P1570 - 35-10 - - - Intermittent

18010 - Power Supply Terminal 30: Voltage too Low

P1602 - 35-00 - -

18011 - Internal Control Module: Failed Self-Test

P1603 - 35-10 - - - Intermittent

17925 - Main Relay (J271): Electrical Malfunction

P1517 - 35-10 - - - Intermittent

17526 - Oxygen (Lambda) Sensor Heating; B1 S2: Open Circuit

P1118 - 35-10 - - - Intermittent

From the codes, I see the immobilizer would cause a no-start issue. Has anyone effectively deleted this immobilizer? I've searched and seen talk of it. After deleting all the codes, tried to restart the car. No go. Codes did not immediately return. Haven't checked recently. Any help would be great b/c I'm running in circles trying to get this thing back on the road.

Cruzad3r

17978 - Engine Start Blocked by Immobilizer

selfproclaimedv8buff

how is this fixed? (reread the end of my post)

TTEUER

Could be the cluster... key needs to be reprogrammed/bad key fob/battery...

DasTT

This is a combination of the instrument cluster and the ECU. Your accidental discharge could have fried enough of the cluster or ECU to keep the immobilizer from allowing a start.

This is an area that is PIN protected (i.e. all the proceedures to adapt a cluster/ECU require a PIN obtained from Audi) so you are pretty much SOL without an Audi tech.

Bad news though... 18011 means a bad ECU. I think you fried a lot with that discharge.

Cruzad3r

dealer is your fix. i doubt vagcom can by pass this.

selfproclaimedv8buff

But i've also tried starting a car with a bad ECM and it'll just turn over without firing. This is not even turning over. This car is a piece. I'm just glad the owner got it for cheap but .. she's paying for it now.

maaliish

is in order. You're the one who fried it ;-)
I just hope that you simply wiped out the immo data and didn't damage the cluster/ecu.

Tons of clutch jobs have been documented on this forum and no one managed to fry anything in the process. Fuse doesn't always help in these situations.

DasTT

It wasn't clear that you had no crank, you said no start. But...

It goes this way... immobilizer in the cluster examines the key, CAN bus communications go to both the central locking system and the ECM. Central locking system has relay control of the starter through "starting interlock" relay (#5) on the micro relay panel that has 6 relays. That's not happening, meaning somewhere along that communications path, things are not working.

Your codes indicate that that you fried several control modules. This is very likely with the short you experienced. No fuse is going to be fast enough to blow on the transceivers for the CAN bus in the modules.

Compared to your older Audi's (and mine), these cars are basically a sophisticated network of computers. You simply discharged a bunch of capacitors in several modules through the output stage. Very expensive to repair now.

Sorry, but I think that's the score in this case.