Transmission Control Module Voltage Supply, Checking

Transmission Control Module Voltage Supply, Checking

• The Transmission Control Module (TCM) (J217) is a component of the mechatronic unit in the transmission and cannot be replaced separately.

Special tools, testers and auxiliary items required

• Multimeter (V.A.G 1526 A) or equivalent.

• Wiring diagrams.

Requirements

• The fuses for the transmission electronics OK..

• The battery voltage must be at least 12.5 volts.

• The Ground (GND) connections at the transmission OK.

• The parking brake engaged.

• The selector lever of automatic transmission in position "P".

• All electrical consumers switched off.

• The ignition switched off.

Test sequence

- Release the electrical connector in the - direction of the arrow - and remove it from the Transmission Control Module (TCM) (J217).





Observe safety precautions.

- Check the electrical harness connector for contact corrosion and ingress of water.

If the electrical harness connector is not OK:

- Repair the malfunction.

If the electrical harness connector is OK:

- Check the wiring according to the wiring diagram:

If no malfunctions are found in the wiring:

- Replace the Mechatronic unit in the transmission.

• The Transmission Control Module (TCM) (J217) is a component of the Mechatronic unit and cannot be replaced separately.

Final procedures

1. Check the DTC memory. => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase DTC memory of the Transmission Control Module (TCM) (J217). => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. Generate readiness code. => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.