RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
‹› The Engine Control Module (ECM) 2 (J624) must remain connected for the following step.
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Using a Multimeter, check the Instrument Cluster Control Module (J285) electrical harness connector terminals 12 to 13 for resistance.
Specified value: 60 to 72 ohms (at approx. 20° C)
If the specified value was not obtained:
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Check the wiring.
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box. Refer to Fuel Injection and Ignition Repair Information.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) ( J623) or the Engine Control Module (ECM) 2 (J624 ). Refer to => [ Engine Control
Module 1, Removing and Installing ] See: Engine Control Module/Service and Repair/Engine Control Module 1, Removing and Installing.
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Using a Multimeter, check the Instrument Cluster Control Module (J285) electrical harness connector to the Motronic Engine Control Module
(ECM) (J623) electrical harness connector T94 or the Engine Control Module (ECM) 2 (J624) electrical harness connector T94a for resistance.
Specified value: 1.5 ohms Max.
If the specified value was not obtained:
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Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
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Check the wiring connection for damage, corrosion, lose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
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Replace the Motronic Engine Control Module (ECM) (J623) or the Engine Control Module (ECM) 2 ( J624). Refer to => [ Engine Control
Module 1, Removing and Installing ] See: Engine Control Module/Service and Repair/Engine Control Module 1, Removing and Installing.
Final procedures
After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] See: Testing and Inspection/Scan Tool Testing and
Procedures/Diagnostic Mode 03 - Read DTC Memory.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Diagnostic Mode 04 - Erase DTC Memory.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] See: Testing and Inspection/Monitors, Trips, Drive
Cycles and Readiness Codes.
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End of diagnosis.