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Inspection Procedure

  1. CHECK WIRE HARNESS (TRANSMISSION CONTROL ECU - BODY GROUND) 
    1. Disconnect the T4 ECU connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      T4-15 (E1) - Body ground Below 1 Ω

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 1: Identifying Transmission Control ECU Connector Terminals
    G04474076Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : GO TO NEXT STEP 

  2. CHECK WIRE HARNESS (TRANSMISSION CONTROL ECU - BODY GROUND) 
    1. Measure the voltage of the wire harness and connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      T4-10 (MWA) - Body ground Below 1 V
      T4-11 (MVA) - Body ground Below 1 V
      T4-12 (MUA) - Body ground Below 1 V

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    Fig 2: Identifying Transmission Control ECU Connector Terminals
    G04474077Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : REPLACE TRANSMISSION CONTROL ECU 

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