TCM Messages Not Received

Test 1 - 2:

SYMPTOM
TCM MESSAGES NOT RECEIVED

WHEN MONITORED
With the ignition on.

SET CONDITION
The BCM does not receive any messages from the Transmission Control Module (TCM) for at least 18 seconds.

NOTE: If NGC, the TCM is internal to the PCM.

POSSIBLE CAUSES
- Attempt to communicate with the TCM
- Body control module