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Home >> Lexus >> 2006 >> RX 330 AWD >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Brake Control >> Vehicle Stability Control System >> DTC C1203/53 ECM Communication Circuit Malfunction >> Inspection Procedure

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the skid control ECU connector and ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      S1-8 (TRC+) - E5-25 (TRC+) Below 1 Ω
      S1-22 (TRC-) - E5-31 (TRC-) Below 1 Ω
      S1-9 (ENG+) - E5-24 (ENG+) Below 1 Ω
      S1-23 (ENG-) - E5-30 (ENG-) Below 1 Ω
    3. Measure the resistance according to the value(s) in the table below.

    Resistance 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    S1-8 (TRC+) - Body ground 10 kΩ or higher
    S1-22 (TRC-) - Body ground 10 kΩ or higher
    S1-9 (ENG+) - Body ground 10 kΩ or higher
    S1-23 (ENG-) - Body ground 10 kΩ or higher
    Fig 1: Disconnecting Skid Control ECU Connector And ECM Connector
    G04090582Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

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

    Resistance 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    E7-1 (E1) - Body ground Below 1 Ω
    Fig 2: Disconnecting ECM Connector
    G04090583Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See CALIBRATION  ).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ABS AND TRACTION ACTUATOR 

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