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СИСТЕМА ECD, Diagnostic DTC:U0101

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DTC Code DTC Name
U0101 Lost Communication with TCM
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DESCRIPTION

The ECM (engine control unit) communicates with the TCM (transmission control ECU) through the Controller Area Network (CAN).

If there is a problem with this communication, the ECM stores a DTC.

DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 3 seconds

The following conditions are met for 1.25 seconds (1 trip detection logic):


  • The battery voltage is 10.5 V or higher.

  • No communication between the ECM and TCM.

  • ECM

  • TCM

  • ECM to TCM circuit
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CHECK ANY OTHER DTC OUTPUT (IN ADDITION TO DTC U0101)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / DTC.

    4. Read the DTCs.

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

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


  2. Click here

    INSPECT ECU POWER SOURCE CIRCUIT (POWER SOURCE, BODY GROUND)


    1. A01IUNZE14

      Disconnect the TCM connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C29-18 (+B) - C29-8 (E1) Ignition switch ON 11 to 14 V
      Table 1. Text in Illustration
      *1

      Front view of wire harness connector

      (to TCM)

    3. Reconnect the TCM connector.


  3. Click here

    CHECK HARNESS AND CONNECTOR (ECM - TCM)


    1. Disconnect the TCM connector.

    2. Disconnect the ECM connector.

    3. A01ITBOE06

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C69-40 (CAN+) - C29-6 (CAN+) Always Below 1 Ω
      C69-63 (CAN-) - C29-7 (CAN-) Always Below 1 Ω
      C69-40 (CAN+) or C29-6 (CAN+) - Body ground or other terminals Always 1 MΩ or higher
      C69-63 (CAN-) or C29-7 (CAN-) - Body ground or other terminals Always 1 MΩ or higher
      *1

      Front view of wire harness connector

      (to ECM)
      *2

      Front view of wire harness connector

      (to TCM)

    4. Reconnect the TCM connector.

    5. Reconnect the ECM connector.


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    REPLACE ECM


    1. Replace the ECM (Click here).


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    CHECK WHETHER DTC OUTPUT RECURS (DTC U0101)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / DTC.

    4. Read the DTCs.

      Table 2. Result
      Result Proceed to
      DTC is not output A
      DTC U0101 is output B

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    GO TO DTC CHARTClick here

  7. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE TCMClick here

  9. Click here

    END