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Home >> Toyota >> 2008 >> Corolla LE, Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control >> Vehicle Stability Control System >> DTC C1203/53 ECM Communication Circuit Malfunction >> Inspection Procedure

Inspection Procedure

NOTE: When replacing the ABS and TRACTION actuator assembly, perform zero point calibration (See CALIBRATION  ).
  1. CHECK HARNESS AND CONNECTOR (ECM - SKID CONTROL ECU) 
    1. Disconnect the skid control ECU connector and ECM connector.
    2. Fig 1: Identifying Skid Control ECU And ECM Connector Terminals
      G05194902Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITION

      Tester Connection Specified Condition
      S1-8 (TRC+) - E6-25 (VSC+) Below 1 Ω
      S1-22 (TRC-) - E6-31 (VSC-) Below 1 Ω
      S1-9 (ENG+) - E6-24 (ENG+) Below 1 Ω
      S1-23 (ENG-) - E6-30 (ENG-) Below 1 Ω
    4. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE 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

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  2. INSPECT ECM (E1 TERMINAL) 
    1. Disconnect the ECM connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITION

      Tester Connection Specified Condition
      E3-5 (E1) - Body ground Below 1 Ω
      Fig 2: Identifying E1 Terminal Of ECM Connector
      G05194903Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (E1 CIRCUIT) 

    OK: REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY