Bosun

My Audi A6 2005, would not start this morning. The starter motor runs ok but the engine refused to kick in.

I ran a scan and the below was the result from the engine module:


Address 01: Engine (BDW) Labels: Redir Fail!
Part No SW: 4F0 910 552 S HW: 4F0 907 552 D
Component: 2.4l V6 MPI 0010
Revision: --H17--- Serial number:
Coding: 0105000002070160
Shop #: WSC 02325 785 00200
VCID: 336E0C0C2BB3

2 Faults Found:
001378 - System Voltage: Too Low
P0562 - 007 - Short to Ground
Freeze Frame:
Fault Status: 01010010

Fault Priority: 2
Fault Frequency: 1
Reset counter: 40
Mileage: 21539 km

Time Indication: 0
Date: 2005.02.01
Time: 12:08:39

Freeze Frame:
RPM: 0 /min
Mass Air / Rev.: 0.0 mg/str
Temperature: 33.0°C
Engine Off
Load: 0.0 %
Voltage: 0.82 V

001671 - ECM Power Relay Control Circuit (J271): Short to Plus
P0687 - 007 - Short to Ground
Freeze Frame:
Fault Status: 01010010

Fault Priority: 2
Fault Frequency: 1
Reset counter: 40
Mileage: 21539 km

Time Indication: 0
Date: 2005.02.01
Time: 12:08:39

Freeze Frame:
RPM: 0 /min
Mass Air / Rev.: 0.0 mg/str
Temperature: 33.0°C
Engine Off
Load: 0.0 %
Speed: 0.0 km/h

Readiness: 0110 1101


Any ideas?

A6Gary

In checking the Bentley Manual for P0687, it states "Check Motronic Engine Control Module (ECM) Power Supply Relay J271." Could be a bad relay and/or voltage supply.

Bosun

A6Gary , Thanks. Any Idea where to find this relay?

am_ver

SAE VAG Description
P0562 16946 System Voltage Low


Automatic Transmission

Multi-Function Transmission Range (TR) Switch, checking
Pressure regulator valves, checking
Sensor for transmission output RPM, checking
Sensor for transmission RPM, checking
Solenoid valve 1, checking
Transmission Control Module (TCM) J217 , replacing
Transmission Fluid Temperature Sensor, checking

_________________________


SAE VAG Description
P0687 17071 ECM/PCM Power Relay Control Circuit High


J271 - Motronic engine control module (ECM) power supply relay

Motronic Engine Control Module (ECM) Power Supply Relay J271 , checking

J623 - Engine Control Module (ECM)

Engine Control Module (ECM) J623 , replacing
Engine Control Module (ECM) J623 voltage supply, checking

am_ver

SIMOS Control Module Power Supply Relay J363 , checking
________________________________

Audi > C6 > 2005-2007
3.2 Liter V6 4V Generic Scan Tool, Engine Code(s): BKH
24 - SIMOS Control Module.Engine Control Module Voltage Supply, Checking

Special tools, testers and auxiliary items required
Multimeter .
Wiring diagram.
Test requirements
Fuses SA14, SA15 and SA18 OK.
Battery voltage at least 12.5 V.
The Ground (GND) connections at the engine and transmission OK.
The generator OK.
The ignition is switched off.
Test procedure
Perform a preliminary check to verify the customers complaint. Refer to Preliminary Check .
If the manufacturers test box is being used, perform the following step.
Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1 . Refer to Engine Mechanical, Fuel Injection Ignition, Fuel Injection Ignition, Repair Group 24.
If the manufacturers test box is not being used, perform the following step.
Remove the Engine Control Module (ECM) J623 Engine Control Module, Replacing .
Checking voltage supply
Using a Multimeter , check the electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical harness connector terminals for voltage.
Engine Control Module (ECM) J623 Electrical Harness Connector Terminal or Test Box Socket Measure to
92 Engine Ground (GND)
69 Engine Ground (GND)
Switch the ignition off.
Specified value: Battery voltage.
If the specified value was not obtained:
Check the Engine Control Module (ECM) J623 electrical harness connector terminal 92 to the Engine Control Module (ECM) Power Supply Relay J363 terminal 3/86 for an open circuit or short to Ground (GND).
Check the Engine Control Module (ECM) J623 electrical harness connector terminal 69 to Engine Control Module (ECM) Power Supply Relay J363 terminal 4/85 for an open circuit or short to Ground (GND).
If the specified values are not obtained:
Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
Check the Engine Control Module (ECM) Power Supply Relay J363 . Engine Control Module Power Supply Relay, Checking
Checking Ground (GND)
Using a Multimeter , check the following wiring connections for resistance.
Engine Control Module (ECM) J623 Electrical Harness Connector Terminal or Test Box Socket Measure to
1 Engine Ground (GND)
2 Engine Ground (GND)
4 Engine Ground (GND)
Specified value: 1.5 Ω max.
If any of the specified values are not obtained:
Check the electrical harness connector for damage, corrosion, loose or broken terminals.
If necessary, repair the wiring connection.
If no malfunctions are found in the wiring and the voltage supply was OK:
Perform a road test to verify any electrical repairs.
If the fault does not return:
Repair complete, Generate readiness code. Refer to Readiness Code .
End diagnosis.
If the fault does return and no malfunction is detected in the wiring and the voltage supply was OK:
Replace the Engine Control Module (ECM) J623 . Refer to Engine Control Module, Replacing .
Assembly is performed in the reverse of the removal.
After the repair work, the following work steps must be performed in the following sequence:
Check the DTC memory. Refer to .
If necessary, erase the DTC memory. Refer to .
If the DTC memory was erased, generate readiness code. Refer to .

Bosun

> I have finally resolved this issue.
>
> I finally discovered the two modules just under the windscreen wipers in the
> engine bay.
>
> I took out all the relays tapped them a bit and replaced.
>
> Car started after wards.
>
> Does anyone have a prognosis?
>
> Are these relays faulty? Should they be changed? Or they just got "Stuck"
> and are they ok now?

2008A6

It will likely happen again. I had to replace mine as the car would either not start on rare occassion or it would put the tranny in limp mode. No problems after replacing relays.

am_ver

Do you have a pic of what is defective?

Bosun

Thanks 2008A6.

@Am ver. I have returned the relays back into their locations.

Rusa

hey bosun i have an 07 audi a6 and i have the same problem that you described and i would like to know if your fix worked just tapping on the relays and putting them back in or did that not last long, if not what fixed your problem thanks.