A4 Quattro Wagon L4-2.0L Turbo (CAEB) (2009)
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Replace the engine control module. Refer to the appropriate service manual for removal and installation procedures.
If the specified resistance value was obtained:
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Remove the engine control module. Refer to the appropriate service manual for removal and installation procedures.
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Check each CAN circuit for a short to ground, short to voltage, open circuit or high resistance.
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Repair as necessary.
If no malfunction is found in the wiring:
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Replace the transmission control module.
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: 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.