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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnostics >> DTC C1203/53: ECM Communication Circuit Malfunction >> Inspection Procedure

Inspection Procedure

  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: 

      SPECIFICATION TESTER CONNECTION

      Tester Connection Specified Condition
      S27-8 (TRC+) - E5-25 (TRC+) Below 1 Ω
      S27-22 (TRC-) - E5-31 (TRC-) Below 1 Ω
      S27-9 (ENG+) - E5-24 (ENG+) Below 1 Ω
      S27-23 (ENG-) - E5-30 (ENG-) Below 1 Ω
    3. Measure the resistance according to the value (s) in the table below.

      Standard: 

      SPECIFICATION TESTER CONNECTION

      Tester Connection Specified Condition
      S27-8 (TRC+) - Body ground 10 kΩ or higher
      S27-22 (TRC-) - Body ground 10 kΩ or higher
      S27-9 (ENG+) - Body ground 10 kΩ or higher
      S27-23 (ENG-) - Body ground 10 kΩ or higher
      Fig 1: Checking Harness And Connector (ECM - Skid Control ECU)
      G02908650Courtesy 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: 

      SPECIFICATION TESTER CONNECTION

      Tester Connection Specified Condition
      E7-1 (E1) - Body ground Below 1 Ω
      Fig 2: Disconnecting ECM Connector
      G02908651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: REPLACE ABS & TRACTION ACTUATOR ASSY (See  REPLACEMENT  ) 
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