fsrowsell

Good day everyone, I had my S8 stored for the pass few months and when I went to start her, nothing but a click. I thought it was the battery, so I replaced, but no difference. I also replaced the ignition switch, but no difference. When I checked the junction under the wheel well the large cable was broke off, so I replaced that and now the engine turns over, but won't start. did a scan and this is what I got... Will the brake switch cause a no start? Cheers

Friday,14,August,2015,11:05:33:21918
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 8.1 x86
VCDS Version: 15.7.0.1
Data version: 20150729
Ross-Tech: Home

Dealer/Shop Name: 0000

VIN: 11111111111111111 License Plate:
Mileage: 113530km-70544mi Repair Order:



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Chassis Type: 4D - Audi A8 D2 (1994 > 2003)
Scan: 25 01 03 08 11 15 16 17 18 35 37 45 55 56 57 65 67 75 76 77
02

Mileage: 113530km-70544miles
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Address 25: Immobilizer Labels: 4B0-953-234.lbl
Part No: 4B0 953 234
Component: IMMO AUZ9Z0V7004344 D03
Coding: 00000
Shop #: WSC 00019
VCID: 60CF80DDE0163D3E36-5140

No fault code found.

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Address 01: Engine Labels: Redir Fail!
Part No: 4D0 907 557 N
Component: 4.2L V8/4V MOTR AT D01
Coding: 04273
Shop #: WSC 00000
VCID: 377D0B8115181A86A7-4AE4

1 Fault Found:
18010 - Power Supply Terminal 30
P1602 - 35-10 - Voltage too Low - Intermittent
Readiness: N/A

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Address 03: ABS Brakes Labels: 8E0-614-111-EDS.lbl
Part No: 8E0 614 111 A
Component: ABS/EDS 5.3 QUATTRO D00
Shop #: BB 24334
VCID: 1C37F42D8CFE59DEAA-5104

No fault code found.

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Address 08: Auto HVAC Labels: Redir Fail!
Part No: 4D0 820 043 E
Component: D2-KLIMAVOLLAUTOMAT_D03
Coding: 00181
Shop #: WSC 02313
VCID: 1E33FE259AE24BCE44-255E

No fault code found.

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Address 15: Airbags Labels: 4D0-959-655-AI7.lbl
Part No: 4D0 959 655 E
Component: Airbag 7 Audi 030B
Coding: 00225
Shop #: WSC 02324
VCID: 34673C8D046EF19E82-5140

1 Fault Found:
00588 - Airbag Igniter; Driver Side (N95)
32-10 - Resistance Too High - Intermittent

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Address 17: Instruments Labels: 4D0-919-033-MYW.lbl
Part No: 4D0 919 035 J
Component: D2-KOMBIINSTRUMENT D48
Coding: 16483
Shop #: WSC 02314
VCID: 2D5129E9E744A056CD-5056

No fault code found.

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Address 35: Centr. Locks Labels: 8D0-862-257.lbl
Part No: 8LO 862 257
Component: ZV-Pumpe, DWA, Funk D03
Coding: 13130
Shop #: WSC 23112
VCID: 112995195B3CE4B6C9-4ECC

15 Faults Found:
01367 - Central Locking Pump Run Time Exceeded (Likely Leak)
35-00 - -
01371 - Alarm triggered by Door Contact Switch; Driver's Side
35-00 - -
01372 - Alarm triggered by Door Contact Switch; Rear Passenger Side
35-00 - -
01374 - Alarm triggered by Terminal 15
35-00 - -
01370 - Alarm triggered by Interior Monitoring
35-00 - -
01369 - Alarm triggered by Hood Switch
35-00 - -
01368 - Alarm triggered by Luggage Compartment Switch
35-00 - -
01366 - Opened Due to Crash Signal
35-00 - -
01361 - Switch for Anti-Theft Alarm; Close
29-00 - Short to Ground
01360 - Switch for Anti-Theft Alarm; Open
29-00 - Short to Ground
01362 - Close Switch for Tailgate/Trunk (F124)
29-00 - Short to Ground
01363 - Switch for Central Locking; Driver's Door (F59)
27-00 - Implausible Signal
01364 - Switch for Central Locking; Passenger Door (F114)
27-00 - Implausible Signal
01365 - Lock/Unlock Switch; Interior
29-00 - Short to Ground
01365 - Lock/Unlock Switch; Interior
28-00 - Short to Plus

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Address 45: Inter. Monitor Labels: 4B0-951-173.lbl
Part No: 8L0 951 173
Component: Innenraumueberw. D03
Coding: 00001
Shop #: WSC 00000
VCID: 6ED3EEE52AC29B4EB4-4B16

No fault code found.

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Address 02: Auto Trans Labels: 01L-927-156.lbl
Part No: 4D0 927 156 BG
Component: AG5 01L 4.2l4V S8RdW D02
Coding: 00101
Shop #: WSC 00000
VCID: 6FEDF3E12DC89246BF-5104

1 Fault Found:
17087 - Brake Switch (F)
P0703 - 35-00 - Electrical Malfunction

End-------------------------(Elapsed Time: 04:52)--------------------------

fsrowsell

The fuel pump is pumping lots of gas! Took out spark plugs and they were dry!
No spark

Torsion'sA8

What pressure are you getting from the fuel pump?
Do you small any gasoline on the plugs?

fsrowsell

I did not hooks a pressure gauge up. Just loosen the line and when I turn the key on it sprayed the fuel every were. So, assume it's getting lots of pressure.

The plugs are dry with no fuel smell
I pulled one plug and while grounding it, I had an helper turn the engine to see if there was spark, but no spark

The car is an 98 S8 UK Spec.

Cheers

Torsion'sA8

Sounds like you could be loosing power to the ECM when you move the key from ON to START.

tozoM8

No signal = no spark.

fsrowsell

I unplugged the ECU and plugged it back in. Now when I try to start her she almost starts! She starts to turn over faster but do not start. Now it is like there is not enough fuel or spark. I will be checking the voltage going to the fuel pump today, to what voltage I get.

fsrowsell

OK, I changed my fuel filter, checked the fuel pump (ok)and cleared my DTCs. She turns over and wants to start but won't. The only error I get now from my scan is
17087 brake switch p0703 - electrical malfunction
Does this mean I need a new brake switch and this is why she won't start?
Cheers

BrianC72gt

Is your car equipped with a manual transmission? I'm not sure if you have to have your foot on the brake to make some magic interlock thing happen, but I doubt it if the engine is actually cranking, so taht likely rules out the bad brake switch.

That old laundry list of fault codes, especially the crash detection has me thinking that your cowl area was at one time full of water and the ECU went for a swim. Worst case, it is toast, but speaking form experience, I doubt it.

Also, if your engine speed sensor is dodgy, it won't tell the ECU you are cranking the engine, so you will get no spark, no continuation of fuel, and no code. In the RUN position, the injectors should be getting battery voltage. The ECU actually switches the ground side. So, if you probe the injector connectors, you should get voltage from one of the two pins with the other probe to ground. If you have a noid light, you can test to see if the ECU is actually switching them on/off.

Does the CEL stay lit in RUN and START positions? It should until the engine actually starts.

Best guess...your engine speed sensor is faulty. It won't throw a code and a defective one will prevent the car from starting. Absent that, if the cowl area really did get wet, a bad combination relay in the footwell relay box (under the front carpet) or a blown fuse(s) would be the next thing to check.

fsrowsell

Yes, you maybe right! The car was buried in snow all winter! I live in canada.
I will check the speed sensor tomorrow.

I have a sensor on order. Once I install the new sensor I will let you know what happens.