A761E Automatic Transmission

A761E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: U0100: Lost Communication with ECM
U0100 - Lost Communication with ECM

DESCRIPTION

The engine control unit and the transmission control unit (TCM) are located inside the ECM. The engine control unit intercommunicates with the transmission control unit with the Controller Area Network (CAN). If there is a problem in this intercommunication, the ECM stores a DTC.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





INSEPCTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

PROCEDURE

1. CHECK DTC OUTPUT (IN ADDITION TO DTC U0100)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / ECT / Trouble Codes.

(e) Read the DTCs using the Techstream.

Result





B -- GO TO DTC CHART Diagnostic Trouble Code Descriptions

A -- REPLACE ECM Service and Repair