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Home >> Scion >> 2004 >> xB Standard >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnosis >> DTC C1203/53: ECM Communication Circuit Malfunction >> Inspection Procedure

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (ENG+, ENG-, TRC+, TRC- OF ECM AND SKID CONTROL ECU) 
    1. Disconnect the skid control connector and ECM connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard: 

      ENG+, ENG-, TRC+, TRC- OF ECM AND SKID CONTROL ECU RESISTANCE

      Tester Connection Specified Condition
      TRC+ (E3-25) - TRC+ (S3-8) 1 Ωor less
      ENG+ (E3-24) - ENG+ (S3-9)
      TRC- (E3-31) - TRC- (S3-22)
      ENG- (E3-30) - ENG- (S3-23)
    3. Measure the resistance according to the value (s) in the table below.

    Standard: 

    ENG+, ENG-, TRC+, TRC- OF ECM AND SKID CONTROL ECU RESISTANCE

    Tester Connection Specified Condition
    TRC+ (E3-25) - Body ground 10 kΩ or higher
    ENG+ (E3-24) - Body ground
    TRC- (E3-31) - Body ground
    ENG- (E3-30) - Body ground
    Fig 1: Identifying ENG+, ENG-, TRC+, TRC- OF ECM & Skid Control ECU Connector Terminals
    G03367830Courtesy 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 AND BODY GROUND) 
    1. Disconnect ECM connector.
    2. Measure the resistance according to the value (s) in the table below.

    Standard: 

    CONNECTOR E1 OF ECM AND BODY GROUND RESISTANCE

    Tester Connection Specified Condition
    E1 (E6-7) - Body ground 1 Ωor less
    Fig 2: Identifying E1 Of ECM & Body Ground Terminals
    G03367831Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: REPLACE ECM