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Transmission Control ECU Communication Stop Mode [09/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR OPEN IN CAN BUS LINES (TCM BRANCH LINE) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the C25 TCM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C25-17 (CANH) - C25-18 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Result

      Proceed to 
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (TCM) 

    Result: 

    OK 

    See step  2

  2. CHECK TCM POWER SOURCE CIRCUIT 
    1. Check the TCM power source circuit.

      Refer to TCM Power Source Circuit [09/2023 - ]

      Result

      Proceed to 
      OK
      NG

    Result: 

    OK 

    REPLACE TCM. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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