Test H: The Transmission Control Module (TCM) Does Not Respond To The Diagnostic Tool

PINPOINT TEST H: THE TRANSMISSION CONTROL MODULE (TCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

H1-H3:

Normal Operation
The TCM communicates with the diagnostic tool through the high speed controller area network (CAN), circuits 1814 (WH/LB) and 1815 (PK/LB). Check the high speed CAN circuits 1814 (WH/LB) and 1815 (PK/LB) between the TCM C1473 and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in one of the CAN circuits, damage to the DLC C251, damage to the TCM C1473, or a problem in an in-line connector.

Possible Causes
- high speed CAN circuit 1814 (WH/LB) open
- high speed CAN circuit 1815 (PK/LB) open
- TCM
- TCM C1473