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Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When replacing the master cylinder solenoid, perform zero point calibration (See CALIBRATION  ).
  1. INSPECT SKID CONTROL ECU (EXI4 TERMINAL VOLTAGE) 
    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 TERMINALS VOLTAGE SPECIFICATION TABLE .

      Standard: 

      TERMINALS VOLTAGE SPECIFICATION TABLE

      Tester Connection Condition Specified Condition
      S28-21 (EXI4) - Body ground 4WD control (L4) switch ON (Transfer L4 position) Below 1.5 V
      S28-21 (EXI4) - Body ground 4WD control (L4) switch OFF (Any transfer position except L4) 8 to 14 V
      Fig 1: Identifying Skid Control ECU Connector Terminals
      G04336001Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step   4 

    OK: Go to next step 

  2. PERFORM TEST MODE (SIGNAL CHECK) (See  TEST MODE PROCEDURE   ) 
    1. Check if test mode (signal check) DTC is detected.

      Result: 

      RESULT REFERENCE

      Test mode (signal check) DTC is output A
      Test mode (signal check) DTC is not output (When troubleshooting in accordance with the DTC TABLE.) B
      Test mode (signal check) DTC is not output (When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE.) C

    B: REPAIR OR REPLACE HARNESS OR CONNECTOR (L4 CIRCUIT) 

    C: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE  PROBLEM SYMPTOMS TABLE   ) 

    A: Go to next step 

  3. RECONFIRM DTC 
    1. Clear the DTC (See DTC CHECK/CLEAR  ).
    2. Check if the same DTC is detected (see DTC CHECK/CLEAR  ).

    HINT:

    Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

    Result: 

    RESULT REFERENCE

    DTC is output A
    DTC is not output B

    B: END 

    A: REPLACE MASTER CYLINDER SOLENOID (See  OVERHAUL  ) 

  4. INSPECT FOUR WHEEL DRIVE CONTROL SWITCH (GND TERMINAL CONTINUITY) 
    1. Disconnect the 4WD control (4WD) switch connector.
    2. Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

      Standard: 

      TERMINALS RESISTANCE SPECIFICATION TABLE

      Tester Connection Specified Condition
      F11-4 (GND) - Body ground Below 1
      Fig 2: Identifying 4WD Control (4WD) Switch Connector
      G04336002Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to next step 

  5. INSPECT FOUR WHEEL DRIVE CONTROL SWITCH 
    1. Check the select high-low system (See INSPECTION or the select 2-4 and high-low system INSPECTION ).

    NG: REPLACE FOUR WHEEL DRIVE CONTROL SWITCH 

    OK: Go to next step 

  6. INSPECT FOUR WHEEL DRIVE CONTROL ECU 
    1. Check the select high-low system (See INSPECTION or the select 2-4 and high-low system INSPECTION ).

    NG: REPLACE FOUR WHEEL DRIVE CONTROL ECU 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (BETWEEN FOUR WHEEL DRIVE CONTROL ECU AND FOUR WHEEL DRIVE CONTROL SWITCH) (See  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    1. Disconnect the 4WD control ECU connector and 4WD control (L4) switch connector.
    2. Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

      Standard: 

      TERMINALS RESISTANCE SPECIFICATION TABLE

      Tester Connection Specified Condition
      F9-15 (LO) - F11-2 (LO) Below 1
      F9-15 (LO) - Body ground 10 k or higher
      Fig 3: Disconnecting 4WD Control ECU Connector
      G04336003Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND FOUR WHEEL DRIVE CONTROL ECU) (See  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    1. Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

      Standard: 

      TERMINALS RESISTANCE SPECIFICATION TABLE

      Tester Connection Specified Condition
      S28-21 (EXI4) - F9-24 (L4) Below 1
      S28-21 (EXI4) - Body ground 10 k or higher
      Fig 4: Identifying Skid Control ECU Connector
      G04336004Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND ECM) (See  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    1. Disconnect the ECM connector.
    2. Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

      Standard: 

      TERMINALS RESISTANCE SPECIFICATION TABLE

      Tester Connection Specified Condition
      S28-21 (EXI4) - E6-13 (L4) Below 1
      S28-21 (EXI4) - Body ground 10 k or higher
      Fig 5: Disconnecting ECM Connector
      G04336005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result: 

      RESULT REFERENCE

      OK (When troubleshooting in accordance with the DTC TABLE.) A
      OK (When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE.) B
      NG C

    B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE   ) 

    C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: END 

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