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On-Vehicle Inspection

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT REAR DIFFERENTIAL LOCK SYSTEM 
    1. Inspect the indicator light.
      1. Check that the indicator light illuminates for approx. 1 second when the ignition switch is turned ON.
      Fig 1: Inspecting Indicator Light
      G04369787Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Inspect the differential lock operation.
      1. Jack up the vehicle and start the engine.
      2. When the differential lock control switch is ON the indicator light blinks.

        HINT:

        If the gears of the differential lock system are not engaged, the indicator light continues blinking, so rotate the tires to engage the gear.

      3. When the differential lock control switch is in the OFF position, the indicator light goes off. The differential lock is released for the rear wheel at this time.
      4. Check the voltage between the terminals of the rear differential lock control ECU when switching the rear differential lock control ON, with the speedometer registering at approximately 7 mph (11 km/h) or more.
        SWITCH POSITION SPECIFIED CONDITION TABLE

        Switch position Terminal Specified condition
        ON M1 - M2 0.5 V or less (No change)
        Fig 2: Checking Voltage Between Terminals Of Rear Differential Lock Control ECU
        G04369788Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Return the differential lock control switch to OFF.
      6. Stop the engine and lower the vehicle.
  2. INSPECT DIFFERENTIAL LOCK SYSTEM CIRCUIT 
    1. Inspect the battery positive voltage.

      Battery positive voltage: 10 to 14 V 

    2. Inspect the system circuit with the connector disconnected.

      Disconnect the connector from the rear differential lock control ECU and inspect the connector on the wire harness side, as shown in REAR DIFFERENTIAL LOCK CONTROL ECU .

      Fig 3: Inspecting System Circuit
      G04369789Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      REAR DIFFERENTIAL LOCK CONTROL ECU

      Symbols (Terminals No.) Trouble part Condition Specified value
      M1 - M2 RR Differential Lock Actuator - Less than 100 Ω
      GND - Body ground Body Ground - Below 1 Ω
      SPD - Body ground Speed Sensor Vehicle moves slowly 1 pulse each 40 cm (15.75 in.)
      IG - Body ground DIFF Fuse Ignition switch ON 10 to 14 V
      RLP - Body ground Rear Differential Lock Indicator Switch Ignition switch ON with indicator light ON About 0 V
      Ignition switch ON with indicator light OFF 10 to 14 V
      R - Body ground Differential Lock Control Switch Ignition switch ON with differential lock control switch RR 10 to 14 V
      Ignition switch ON with differential lock control switch OFF About 0 V

      If the result is not as specified value, check and repair or replace the malfunctioning part shown in PROBLEM SYMPTOMS TABLE .

    3. Inspect the system circuit with the connector connected.
      1. Turn the ignition switch to the ON position.
      2. Using a voltmeter, measure the voltage when the differential lock control switch is in the positions shown in DIFFERENTIAL LOCK CONTROL SWITCH .
        DIFFERENTIAL LOCK CONTROL SWITCH

        Tester Connection + - - Switch position Specified condition
        RLP - GND RR(1) 0.5 V or less
        M1 - M2 OFF -> RR 0.5 V or less -> 10 - 14 V
        (Approx. 1 sec.) -> 0.5 V or less
        M2 - M1 RR -> OFF
        (1) The rear differential should be locked mechanically. If the result is not as specified, replace the ECU.
        Fig 4: Inspecting System Circuit
        G04369790Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

      3. Install the ECU
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