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Home >> Toyota >> 2006 >> Camry Base, 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 brake actuator assy, perform zero point calibration (see CALIBRATION ).
  1. CONFIRM ENGINE TYPE 
    ENGINE TYPE

    A 2AZ
    B 1MZ, 3MZ

    B: Go to step 4 

    A: Go to next step 

  2. CHECK DTC (CAN COMMUNICATION SYSTEM) 
    1. Check DTCs of the CAN communication system (See DIAGNOSTIC TROUBLE CODE CHART ).

    Result: 

    DTC RESULT REFERENCE

    A DTC is not output
    B DTC is output

    B: REPAIR CIRCUIT INDICATED BY OUTPUT CODE (See  DIAGNOSTIC TROUBLE CODE CHART  ) 

    A: Go to next step 

  3. RECONFIRM DTC 
    1. Clear the DTCs (SEE DTC CHECK/CLEAR ).
    2. Turn the ignition switch to the ON position.
    3. Are the same DTCs recorded?

    NO: END 

    YES: REPLACE BRAKE ACTUATOR ASSY (See step 3 in  REPLACEMENT  ) 

  4. CHECK HARNESS AND CONNECTOR (ECM - SKID CONTROL ECU) 
    1. Disconnect the skid control ECU connector S1 and ECM connector E6.
    2. Measure the resistance according to the value(s) in ECM - SKID CONTROL ECU (1 OF 2)  .

      Standard: 

      ECM - SKID CONTROL ECU (1 OF 2)

      Tester Connection Specified Condition
      S1-8 (TRC+) - E6-25 (TRC+) Below 1
      S1-22 (TRC-) - E6-31 (TRC-) Below 1
      S1-9 (ENG+) - E6-24 (ENG+) Below 1
      S1-23 (ENG-) - E6-30 (ENG-) Below 1
    3. Measure the resistance according to the value(s) in ECM - SKID CONTROL ECU (2 OF 2)  .

    Standard: 

    ECM - SKID CONTROL ECU (2 OF 2)

    Tester Connection Specified Condition
    S1-8 (TRC+) - Body ground 10 k or higher
    S1-22 (TRC-) - Body ground 10 k or higher
    S1-9 (ENG+) - Body ground 10 k or higher
    S1-23 (ENG-) - Body ground 10 k or higher
    Fig 1: Identifying Skid Control ECU Connector S1 And ECM Connector E6
    G04390050Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (E1 OF ECM AND BODY GROUND) 
    1. Disconnect the ECM connector E8.
    2. Measure the resistance according to the value(s) in E1 OF ECM AND BODY GROUND  .

    Standard: 

    E1 OF ECM AND BODY GROUND

    Tester Connection Specified Condition
    E8-1 (E1) - Body ground Below 1
    Fig 2: Checking Harness And Connector (E1 Of ECM And Body Ground)
    G04390051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. RECONFIRM DTC 
    1. Clear the DTCs (See DTC CHECK/CLEAR ).
    2. Turn the ignition switch to the ON position.
    3. Are the same DTCs recorded?

    NO: END 

    YES: REPLACE BRAKE ACTUATOR ASSY (See step 3 in  REPLACEMENT  ) 

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