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Home >> Toyota >> 2006 >> Corolla LE, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics) >> DTC C1203/53: ECM Communication Circuit Malfunction >> Inspection Procedure

Inspection Procedure

NOTE: When replacing the ABS & TRACTION actuator assy, 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. Measure the resistance according to the value (s) in the table below.

      Standard: 

      ECM AND SKID CONTROL ECU TERMINALS RESISTANCE

      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
    3. Measure the resistance according to the value (s) in the table below.

      Standard: 

      ECM AND SKID CONTROL ECU TERMINALS RESISTANCE

      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 ECM Connector
      G02599749Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP. 
  2. CHECK HARNESS AND CONNECTOR (E1 OF ECM - BODY GROUND) 
    1. Disconnect the ECM connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard: 

      ECM TERMINAL AND BODY GROUND RESISTANCE

      Tester Connection Specified Condition
      E3-5(E1)-Body ground Below 1 Ω
      Fig 2: Disconnecting ECM Connector
      G02599750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP. 

      REPLACE ABS & TRACTION ACTUATOR ASSY (SEE  REPLACEMENT  )