U0101

3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: U0101: Lost Communication with TCM
U0101 - Lost Communication with TCM

DESCRIPTION

The engine control unit and the Transmission Control Module (TCM) are located inside the ECM. The engine control unit intercommunicates with the TCM through the Controller Area Network (CAN).

If there is a problem in this intercommunication, the ECM sets a DTC.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN





* Connect the Techstream to the DLC3.

* Turn the ignition switch to ON and turn the Techstream on.

* Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

* Turn the ignition switch off and wait for at least 30 seconds.

* Turn the ignition switch to ON and turn the Techstream on [A].

* Wait 5 seconds or more.

* Enter the following menus: Powertrain / Engine / Trouble Code [B].

* Read the DTCs.

HINT
* If a DTC is output, the system is malfunctioning.
* If a DTC is not output, perform the following procedure.
* Enter the following menus: Powertrain / Engine / Utility / All Readiness.

* Input the DTC: U0101.

* Check the DTC judgment result.





HINT
If the judgment result shows ABNORMAL, the system has a malfunction.

* If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.
INSEPCTION PROCEDURE

PROCEDURE

1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0101)

(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 / Engine / Trouble Codes.

(e) Read the DTCs.

Result:





HINT
If any DTCs other than U0101 are output, troubleshoot those DTCs first.

B -- GO TO DTC CHART Diagnostic Trouble Code Descriptions

A -- REPLACE ECM Service and Repair