Transmission Control System

DTC U0100 Lost Communication with ECM/PCM "A"

DESCRIPTION
The engine control unit intercommunicates with the TCM with the Controller Area Network (CAN). If there is a problem in this intercommunication, the TCM sets a DTC.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM:

INSPECTION PROCEDURE

HINT:
^ Refer to inspection procedure for CAN communication system.
^ If the CAN communication malfunctions, the TCM cannot receive the current data from the ECM. In this case, the freeze frame data output from the TCM has not been updated, so the data will not be useful for the inspection. However, reading the Data List as the first step in troubleshooting is effective to find malfunctions.
^ The malfunction area can be checked using the BUS CHECK function on the intelligent tester.

Step 1 (Part 1):

Step 1 (Part 2), Step 2-3: