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Home >> Toyota >> 2008 >> 4Runner Sport, 4.7 T, AWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control >> Vehicle Stability Control System >> DTC C1258/58: Transfer 4WD Position Switch Circuit >> Inspection Procedure

Inspection Procedure

NOTE: When replacing the master cylinder solenoid, perform zero point calibration (See CALIBRATION  ).
  1. INSPECT 4WD CONTROL SWITCH 
    1. Check the select 2-4 and high-low system (See INSPECTION ).

    NG: REPLACE 4WD CONTROL SWITCH 

    OK: Go To Next Step 

  2. CHECK HARNESS AND CONNECTOR (4WD CONTROL SWITCH - BODY GROUND) 
    1. Disconnect the 4WD control (4WD) switch connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      F11-4 (GND) - Body ground Always Below 1 Ω
      Fig 1: Identifying F11 4WD Control (4WD) Switch Connector Terminals
      G05556544Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go To Next Step 

  3. CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU - 4WD CONTROL SWITCH) 
    1. Disconnect the 4WD control ECU (F9) connector and 4WD control (4WD) switch connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      F9-8 (2-4) - F11-5 (2-4) Always Below 1 Ω
      F9-8 (2-4) - Body ground Always 10 kΩ or higher
      Fig 2: Identifying 4WD Control ECU (F9) Connector & F11 4WD Control (4WD) Switch Connector Terminals
      G05556545Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step 

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ECM) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      S28-26 (EXI3) - B6-8 (4WD) Always Below 1 Ω
      S28-26 (EXI3) - Body ground Always 10 kΩ or higher
      Fig 3: Identifying Harness Connector (Skid Control ECU - ECM)
      G05556546Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step 

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - 4WD CONTROL ECU - ADD ACTUATOR) 
    1. Disconnect the 4WD control ECU (F10) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      S28-26 (EXI3) - F10-18 (ADD) Always Below 1 Ω
      S28-26 (EXI3) - A11-3 (ADD) Always Below 1 Ω
      S28-26 (EXI3) - Body ground Always 10 kΩ or higher
      Fig 4: Identifying 4WD Control ECU (F10) Connector Terminals
      G05556547Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step 

  6. INSPECT 4WD CONTROL ECU 
    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 AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      S28-26 (EXI3) - Body ground 4WD control (4WD) switch ON (Transfer 4WD position) Below 1.5 V
      S28-26 (EXI3) - Body ground 4WD control (4WD) switch ON (Transfer 2WD position) 8 to 14 V
      Fig 5: Identifying S28 Skid Control ECU Connector Terminals
      G05556548Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE 4WD CONTROL ECU 

    OK: Go To Next Step 

  7. INSPECT ECM (4WD TERMINAL) 
    1. Turn the ignition switch off.
    2. Disconnect the ECM connector.
    3. Turn the ignition switch to the ON position.
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      E6-8 (4WD) - Body ground 4WD control (4WD) switch ON (Transfer 4WD position) Below 1.5 V
      4WD control (4WD) switch ON (Transfer 2WD position) 10 to 14 V
      Fig 6: Identifying ECM Connector
      G05556549Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE ECM 

    OK: Go To Next Step 

  8. INSPECT ADD ACTUATOR 
    1. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      S28-26 (EXI3) - Body ground 4WD control (4WD) switch ON (Transfer 4WD position) Below 1.5 V
      4WD control (4WD) switch ON (Transfer 2WD position) 10 to 14 V
      Fig 7: Identifying S28 Skid Control ECU Connector Terminals
      G05556548Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE ADD ACTUATOR 

    OK: REPLACE MASTER CYLINDER SOLENOID  (See DISASSEMBLY )

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