A4 Quattro Wagon L4-2.0L Turbo (CAEB) (2009)
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Switch the ignition off.
Specified value: 0.5 V Max.
If the specified value was obtained:
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Replace the Motronic Engine Control Module (ECM) Power Supply Relay (J271).
If the specified value was not obtained:
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Check the wiring for a short circuit to Battery (+), or an open circuit.
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Check the wiring connection for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring and voltage supply was not OK:
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Replace the Motronic Engine Control Module (ECM) (J623).
Final procedures
After the 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: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Modes 01 - 09.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Modes 01 - 09.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes.