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Inspection Procedure

NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (See INITIALIZATION ).
  1. INSPECT CAN COMMUNICATION SYSTEM 
    1. Check if the CAN communication system DTC is output (See DIAGNOSIS SYSTEM ).

    Result 

    RESULT CHART

    Condition Proceed To
    DTC is not output A
    DTC is output B

    B: REPAIR CAN COMMUNICATION SYSTEM 

    A: Go to next step 

  2. INSPECT MULTIPLEX COMMUNICATION SYSTEM 
    1. Check if the multiplex communication system DTC is output (See DTC CHECK / CLEAR ).

    Result 

    RESULT CHART

    Condition Proceed To
    DTC is not output A
    DTC is output B

    B: REPAIR MULTIPLEX COMMUNICATION SYSTEM 

    A: Go to next step 

  3. INSPECT IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED 
    1. Check the skid control ECU connector's connecting condition.

      OK: The connector should be securely connected. 

    NG: CONNECT CONNECTOR TO ECU CORRECTLY 

    OK: Go to next step 

  4. INSPECT BATTERY 
    1. Check the battery voltage.

      Voltage: 

      Voltage: 10 to 14 V 

    NG: INSPECT CHARGING SYSTEM 

    OK: Go to next step 

  5. INSPECT SKID CONTROL ECU (IG1 TERMINAL) 
    1. Turn the ignition switch on.
    2. Measure the voltage according to the value(s) in the table below.

    Voltage 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    S39-7 (IG1) - Body ground Ignition switch on 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 

    Fig 1: Identifying Skid Control ECU Connector Terminal (IG1 Terminal)
    G05276921Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    OK: Go to next step 

  6. INSPECT SKID CONTROL ECU (GND TERMINAL) 
    1. Measure the resistance according to the value(s) in the table below.

    Resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Specified Condition
    S38-1 (GND1) - Body ground Below 1 Ω
    S39-2 (GND2) - Body ground Below 1 Ω
    S39-1 (GND3) - Body ground Below 1 Ω
    S40-2 (GND4) - Body ground Below 1 Ω
    S40-1 (GND5) - Body ground Below 1 Ω
    S41-4 (GND6) - Body ground Below 1 Ω
    Fig 2: Identifying Skid Control ECU Connector Terminal (GND Terminal)
    G05276922Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

    OK: Go to next step 

  7. INSPECT COMBINATION METER ASSEMBLY 
    1. Check the combination meter assembly (See HOW TO PROCEED WITH TROUBLESHOOTING ).

      HINT:

      If troubleshooting has been carried out according to the PROBLEM SYMPTOMS TABLE, refer back to the table and proceed to the next step before replacing the part (See PROBLEM SYMPTOMS TABLE ).

    NG: REPLACE COMBINATION METER ASSEMBLY 

    OK: REPLACE SKID CONTROL ECU 

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