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Test G: The Transmission Control Module (TCM) Does Not Respond To The Scan Tool

PINPOINT TEST G: THE TRANSMISSION CONTROL MODULE (TCM) DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The transmission control module (TCM) is used on automatic transmission equipped diesel engine vehicles only. The TCM communicates with the scan tool through the high speed controller area network (HS-CAN), circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the HS-CAN network connection to the TCM. The TCM shares the HS-CAN network with the PCM, the ABS module, the trailer brake control (TBC) module (if equipped), the variable geometry turbocharger (VGT) actuator, the instrument cluster, the supplemental heater control module (if equipped) and the restraints control module (RCM). Voltage for the TCM is provided by circuits CBB72 (GN/VT) and SBB37 (GY/RD). Circuit GD120 (BK/GN) provides ground.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- TCM


G1:






G1-G2:






G3-G4:




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