ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:U0100/A2

DTC Code DTC Name
U0100/A2 Lost Communication with ECM/PCM "A"

DESCRIPTION

TCM intercommunicates with ECM through the Controller Area Network (CAN). If there is a problem in this intercommunication, the TCM sets the DTC.

DTC No. DTC Detection Condition Trouble Area
U0100/A2

When TCM cannot receive communication signals from ECM.

(1 trip detection logic)

  • Open or short in TCM to ECM circuit

  • TCM

  • ECM

WIRING DIAGRAM

A01BG75E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (TCM - ECM)


    1. A01BEIKE01

      Disconnect the TCM connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance.

      Standard resistance
      Tester Connection Specified Condition
      O3-21 (CAN+) - B7-22 (CAN+) Below 1 Ω
      O3-20 (CAN-) - B7-21 (CAN-)
      O3-21 (CAN+) or B7-22 (CAN+) - Body ground 10 KΩ or higher
      O3-20 (CAN-) or B7-21 (CAN-) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE TCM


    1. Replace the TCM.

      Note

      Replace the TCM with a TCM from a normally functioning vehicle of the same model.


    NEXT

  3. CHECK DTC OUTPUT (DTC U0100/A2)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position.

    3. Turn on the tester.

    4. Clear the DTC Click here.

    5. Turn the ignition switch off and turn the tester off.

    6. Start the engine and turn on the tester.

    7. Select the item: "Power train / ECT / DTC / Current or Pending".

    8. Read the DTCs using the intelligent tester.

      Result
      Display (DTC output) Proceed to
      U0100/A2 A
      No DTC B

      Tech Tips

      When not using the intelligent tester, refer to DTC CHECK / CLEAR Click here.


    B

    REPLACE TCM

    A

    REPLACE ECM