SFI SYSTEM(w/o Secondary Air Injection System), Diagnostic DTC:U0101

DTC Code DTC Name
U0101 Lost Communication with TCM

DESCRIPTION

The Transmission Control Module (TCM) and ECM perform 2-way communications with each other via the Controller Area Network (CAN). The TCM sends signals to the ECM concerning required engine rpm, required engine torques, warning indicators in the combination meter, DTCs and other data. The ECM sends signals to the TCM concerning engine rpm, opening angles of the throttle valve, temperature of intake air, temperature of engine coolant, engine torques and other data. If the TCM cannot communicate with the ECM, the TCM will conclude that there is a malfunction in the CAN system, illuminate the MIL and store a DTC.

DTC Code DTC Detection Condition Trouble Area
U0101 No communication from TCM continues

  • Open or short in TCM and ECM circuit

  • TCM

  • ECM

PROCEDURE


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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS ON.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      U0101 is output A
      U0101 and other DTCs are output B

    B

    GO TO DTC CHART Click here

    A

  2. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  3. CHECK IF DTC RECURS


    1. Connect the GTS to the DLC3.

    2. Clear the DTC Click here.

    3. Start the engine.

    4. Read the DTCs.

      Result
      Result Proceed to
      No DTC is output A
      Other DTCs are output B

    A

    END

    B

    GO TO DTC CHART Click here