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Home >> Toyota >> 2011 >> Highlander Hybrid Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 42 (Engine Control System (1AR-FE) (Diagnostic Codes (P1604 - U0101) & Circuit Tests)) >> SFI System >> DTC U0101: Lost Communication with TCM >> Procedure

DTC U0101: Lost Communication with TCM: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC U0101) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Trouble Codes.
    5. Read the DTCs.

      Result

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

      HINT: 

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

    B → See step   7 

    A: Go to next step 

  2. INSPECT ECU POWER SOURCE CIRCUIT (TCM POWER SOURCE) 
    1. Disconnect the TCM connector.
      Fig 1: TCM Connector Terminal Identification
      GTY185127Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      B52-18 (+B) - Body ground Ignition switch ON 11 to 14 V
      B52-1 (BATT) - Body ground Always 11 to 14 V
    4. Reconnect the TCM connector.

    NG → See step   8 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND) 
    1. Disconnect the TCM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Condition Condition Specified Condition
      B52-8 (E1) - Body ground Always Below 1 Ω
    3. Reconnect the TCM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (ECM - TCM) 
    1. Disconnect the ECM connector.
    2. Disconnect the TCM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      B52-6 (CAN+) - B51-30 (CAN+) Always Below 1 Ω
      B52-7 (CAN-) - B51-36 (CAN-) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      B52-6 (CAN+) or B51-30 (CAN+) - Body ground Always 10 kΩ or higher
      B52-7 (CAN-) or B51-36 (CAN-) - Body ground Always 10 kΩ or higher
    4. Reconnect the ECM connector and TCM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. REPLACE ECM 
    1. Replace the ECM, refer to REMOVAL .

    NEXT: Go to next step 

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC U0101) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Trouble Codes.
    5. Read the DTCs.

      Result

      Result Proceed to
      DTC is not output A
      DTC U0101 is output B

    B → See step   9 

    A → REPAIR COMPLETED 

  7. GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  8. GO TO TCM POWER SOURCE CIRCUIT. Refer to  ECU Power Source Circuit 
  9. REPLACE TCM. Refer to  REMOVAL 
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