A8L Quattro Sedan V8-4.2L (BVJ) (2007)
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Switch the ignition on.
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Using a Multimeter, check the Power Supply Relay (terminal 15) (J329) socket 2/87 to Ground (GND).
Specified value: battery voltage.
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Switch the ignition off.
If the specified value was not obtained:
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Check the wiring from the Power Supply Relay (terminal 15) (J329) socket 2/87 to the Transmission Control Module (TCM) (J217) electrical
harness connector terminal 9 for an open circuit or a short circuit.
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If necessary, repair the faulty wiring connection.
If the specified value was obtained:
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Using a Multimeter, check the Transmission Control Module (TCM) (J217) electrical harness connector terminal 14 to Ground (GND).
Specified value: battery voltage.
If the specified value was obtained:
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Check the wiring from the Battery to the Transmission Control Module (TCM) (J217) electrical harness connector terminal 14 for an open circuit
or a short circuit.
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If necessary, repair the faulty wiring connection.
If the specified value was obtained:
Checking Ground (GND)
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Using a Multimeter, check the Transmission Control Module (TCM) (J217) electrical harness connector terminals 13 and 16 to Ground (GND) for
resistance.
Specified value: 1.5 ohms
If the specification was not obtained:
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Check the wiring for a an open circuit.
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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 Mechatronic unit in the transmission.
Final procedures
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/Diagnostic Mode 03 - Read DTC Memory.
2. If necessary, erase the Transmission Control Module (TCM) (J217) 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/Diagnostic Mode 04 - Erase DTC Memory.
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.
