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.