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Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC 
    1. Clear the DTC (See DTC CHECK / CLEAR  ).
    2. Start the engine.
    3. Drive the vehicle, accelerating to a speed of 12 mph (20 km/h) or more and check if the speed sensor DTC (brake control system DTC) is output (See DTC CHECK / CLEAR ).

    Result 

    DTC OUTPUT RESULT

    Result Proceed to
    No speed sensor DTC (brake control system DTC) is output  A 
    Speed sensor DTC (brake control system DTC) is output  B 

    B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (BRAKE CONTROL SYSTEM) 

    A: Go To Next Step 

  2. READ VALUE OF INTELLIGENT TESTER 
    1. Connect the intelligent tester to the DLC3.
    2. Start the engine.
    3. Select the "DATA LIST" on the intelligent tester (See DATA LIST / ACTIVE TEST  ).
    4. Check that the speed values detected at all four wheels displayed on the intelligent tester are the same when driving the vehicle.

    HINT:

    Drive the vehicle straight ahead.

    DATA LIST: 4WD 

    DATA LIST REFERENCE (4WD)

    Item Measurement Item / Range (Display) Normal Condition
    FR WHEEL SPD Wheel speed sensor (FR) reading / min.: 0 mph (0 km/h), max.: 202 mph (326.4 km/h) Actual wheel speed
    FL WHEEL SPD Wheel speed sensor (FL) reading / min.: 0 mph (0 km/h), max.: 202 mph (326.4 km/h) Actual wheel speed
    RR WHEEL SPD Wheel speed sensor (RR) reading / min.: 0 mph (0 km/h), max.: 202 mph (326.4 km/h) Actual wheel speed
    RL WHEEL SPD Wheel speed sensor (RL) reading / min.: 0 mph (0 km/h), max.: 202 mph (326.4 km/h) Actual wheel speed

    OK: The speed of all four wheels displayed on the intelligent tester should match. 

    NG: Go to STEP  4

    OK: Go To Next Step 

  3. RECONFIRM DTC 
    1. Clear the DTC (See DTC CHECK / CLEAR  ).
    2. Start the engine.
    3. Drive the vehicle, accelerating to a speed of 12 mph (20 km/h) or more and check if the same DTC is output.

    Result 

    DTC OUTPUT RESULT

    Result Proceed to
    DTC is output  A 
    DTC is not output  B 

    B: CHECK INTERMITTENT PROBLEMS 

    A: REPLACE 4WD CONTROL ECU 

  4. CHECK HARNESS AND CONNECTOR (4WD CONTROL ECU TO SKID CONTROL ECU) 
    1. Disconnect the 4WD control ECU connector and skid control ECU connector.
    2. Measure the resistance according to the value(s) in RESISTANCE SPECIFICATIONS TABLE  .

    Standard resistance 

    RESISTANCE SPECIFICATIONS TABLE

    Tester Connection Specified Condition
    A32-3 (FRO) - A14-37 (FRO)  Below 1 ohms 
    A32-16 (FLO) - A14-38 (FLO)  Below 1 ohms 
    A32-2 (RRO) - A14-39 (RRO)  Below 1 ohms 
    A32-15 (RLO) - A14-40 (RLO)  Below 1 ohms 
    A32-3 (FRO) - Body ground  10 k ohms or higher 
    A32-16 (FLO) - Body ground  10 k ohms or higher 
    A32-2 (RRO) - Body ground  10 k ohms or higher 
    A32-15 (RLO) - Body ground  10 k ohms or higher 
    A32-30 (GND) - Body ground  Below 1 ohms 
    Fig 1: Identifying 4WD Control ECU & Skid Control ECU Connector Terminals
    G04046719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step 

  5. INSPECT 4WD CONTROL ECU (INPUT SIGNAL OF VEHICLE SPEED) 
    1. Connect the 4WD control ECU connector.
    2. Connect the oscilloscope to the 4WD control ECU.
    3. Start the engine.
      Fig 2: Identifying 4WD Control ECU Connector Terminals
      G04046720Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Check the signal waveform when the vehicle is driving.

    Standard 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    A32-3 (FRO) - A32-30 (GND)  Waveform is output 
    A32-16 (FLO) - A32-30 (GND)  Waveform is output 
    A32-2 (RRO) - A32-30 (GND)  Waveform is output 
    A32-15 (RLO) - A32-30 (GND)  Waveform is output 
    Fig 3: Vehicle Signal Waveform
    G04046721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    As vehicle speed (wheel rotation speed) increases, the width of the waveform narrows.

    WAVEFORM REFERENCE

    Item Contents
    Tool setting 2 V/DIV, 2 ms/DIV
    Vehicle condition Driving at approximately 18 mph (30 km/h)

    Result 

    WAVEFORM RESULT

    Result Proceed to
    Waveform is normal  A 
    Waveform is not normal/Waveform is not output  B 

    B: REPLACE BRAKE CONTROL ACTUATOR ASSEMBLY (SKID CONTROL ECU) 

    A: REPLACE 4WD CONTROL ECU 

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