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Inspection Procedure

NOTE: When replacing the master cylinder solenoid, perform zero point calibration (See CALIBRATION  ).
  1. INSPECT SKID CONTROL ECU (EXI TERMINAL) 
    Fig 1: Identifying Skid Control ECU Connector Terminals S37
    G05262747Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the skid control ECU connector.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      S37-27 (EXI) - Body ground Center diff. locked (Center diff. lock switch ON) Below 1.5 V
      S37-27 (EXI) - Body ground Center diff. free (Center diff. lock switch OFF) 10 to 14 V

    OK: REPLACE MASTER CYLINDER SOLENOID 

    NG: Go to Next Step 

  2. INSPECT CENTER DIFFERENTIAL LOCK SWITCH 
    Fig 2: Identifying Center Differential Lock Switch
    G05262748Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the center diff. lock switch connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      C4-3 - C4-4 Switch is pushed in Below 1 Ω
      C4-3 - C4-4 Switch is not pushed in 10 kΩ or higher

    NG: REPLACE CENTER DIFFERENTIAL LOCK SWITCH 

    OK: Go to Next Step 

  3. INSPECT 4WD CONTROL ECU 
    1. Check the center diff. lock system (See INSPECTION ).

    NG: REPLACE 4WD CONTROL ECU 

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - CENTER DIFFERENTIAL LOCK SWITCH) 
    Fig 3: Identifying 4WD Control ECU Connector
    G05262749Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 4WD control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Specified Condition
      C5-6 (C/D) - C4-3 Below 1 Ω
      C5-6 (C/D) - Body ground 10 kΩ or higher
      C4-4 - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - 4WD CONTROL ECU) 
    Fig 4: Identifying Skid Control ECU Connector Terminals S37
    G05262750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Specified Condition
      S37-27 (EXI) - C5-8 (P1) Below 1 Ω
      S37-27 (EXI) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MASTER CYLINDER SOLENOID 

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