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Select High-Low System (VF4BM): Inspection: Notes

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Switch the four wheel drive control switch under the condition that A/T shift lever is in "N" position and the vehicle speed is 5 km/h or less.
  • Do not operate the four wheel drive control switch and the differential lock switch at the same time.
  1. INSPECT H4 (Differential lock "FREE(" <=> H4 (Differential lock "LOCK(" SHIFT 
    1. Start the engine, and the differential lock switch is in "OFF" position.
    2. Turn the four wheel drive control switch to "H4" position while pressing it.
    3. Check that the center diff. lock indicator light comes on after pressing the differential lock switch for 2 seconds. Check that the center diff. lock indicator light goes off after pressing the differential lock switch for 2 seconds.
    Fig 1: Inspecting H4 (Differential Lock "Free")
    G02573201Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT L4 (Differential lock "FREE(" <=> L4 (Differential lock "LOCK(" SHIFT 
    1. Start the engine, and differential lock switch is in "OFF" position.
    2. Turn the four wheel drive control switch to "L4" position while pressing it.
    3. Check that the 4LO indicator light comes on after it is blinking.
    4. Check that the center diff. lock indicator light comes on after pressing the differential lock switch for 2 seconds. Check that the center diff. lock indicator light goes off after pressing the differential lock switch for 2 seconds.
    Fig 2: Inspecting L4 (Differential Lock "Free")
    G02573202Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT H4 (Differential lock "FREE(" <=> L4 (Differential lock "FREE(" SHIFT 
    1. Start the engine, and differential lock switch is in "OFF" position.
    2. Turn the four wheel drive control switch from the "H4" position to the "L4" position while pressing it.
    3. Check that the 4LO indicator light comes on after it is blinking.
    4. Turn the four wheel drive control switch from the "L4" position to the "H4" position while pressing it.
    5. Check that the 4LO indicator light goes off after it is blinking.
    Fig 3: Inspecting H4 (Differential Lock "Free")
    G02573203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT H4 (Differential lock "LOCK(" <=> L4 (Differential lock "LOCK(" SHIFT 
    1. Start the engine, and differential lock switch is in "OFF" position.
    2. Check that the center diff. lock indicator light comes on after pressing the differential lock switch for 2 seconds.
    3. Turn the four wheel drive control switch from the "H4" position to the "L4" position while pressing it.
    4. Check that the 4LO indicator light comes on after it is blinking.
    5. Turn the four wheel drive control switch from the "L4" position to the "H4" position while pressing it.
    6. Check that the 4LO indicator light goes off after it is blinking.
    Fig 4: Inspecting H4 (Differential Lock "Lock")
    G02573204Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT DIFFERENTIAL LOCK SWITCH CONTINUITY 
    1. Remove the instrument panel finish lower panel sub-assy.
    2. Remove the differential lock switch from the instrument panel finish lower sub-assy.
    3. Inspect the continuity between the each terminal.
      TESTER CONNECTION SPECIFICATION (1 OF 3)

      Switch position Tester connection Specified condition
      OFF +B (3) <=> GND (4) No continuity
      Hold ON +B (3) <=> GND (4) Continuity
      Illumination ILL + (1) <=> ILL- (2) Continuity

      If continuity is not as specified, replace the differential lock switch or bulb.

    Fig 5: Inspecting Continuity Between Terminal
    G02573205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSPECT FOUR WHEEL DRIVE CONTROL SWITCH 
    1. Remove the center instrument cluster finish panel sub-assy.
    2. Remove the four wheel drive control switch from the center instrument cluster finish panel sub-assy.
    3. Inspect the continuity between the each terminals.
      TESTER CONNECTION SPECIFICATION (2 OF 3)

      Switch position Tester connection Specified condition
      H4 LO (2) <=> GND (4) No continuity
      L4 LO (2) <=> GND (4) Continuity
      Illumination ILL+ (1) <=> ILL- (3) Continuity

      If continuity is not as specified, replace the four wheel drive control switch or bulb.

    Fig 6: Inspecting Four Wheel Drive Control Switch
    G02573206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. INSPECT ACTUATOR 
    NOTE: Do as inspect the actuator while overhauling the transfer or as a unit.
    1. Turn the ignition switch to ON.
    2. Check the operating sound produced by four wheel drive control switch operation and the differential lock switch operation.

    If the operating sound cannot be heard, check the four wheel control ECU and the wire harness in the next step. When the wire harness and four wheel drive control ECU is normal, replace the actuator.

  8. INSPECT WIRE HARNESS 
    1. Disconnect the actuator connector and four wheel drive control ECU connector.
    2. Check continuity on the wire harness between four wheel drive control ECU and the actuator.
    TESTER CONNECTION SPECIFICATION (3 OF 3)

    Tester connection Specified condition
    TM1 (A-2) - TM1 (B-2) Continuity
    TM2 (A-5) - TM2 (B-1) Continuity
    TL2 (A-24) - TL2 (B-4) Continuity
    TL3 (A-23) - TL3 (B-5) Continuity
    HM2 (A-4) - HM2 (B-7) Continuity
    HM1 (A-1) - HM1 (B-8) Continuity
    P1 (A-22) - CDL (B-9) Continuity
    HL2 (A-26) - HL2 (B-11) Continuity
    HL1 (A-17) - HL1 (B-12) Continuity

    If continuity is not as specified, repair or replace the wire harness.

    Fig 7: Disconnecting Actuator Connector And Four Wheel Drive Control ECU Connector
    G02573207Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. INSPECT FOUR WHEEL DRIVE CONTROL ECU 
    1. Connect the wire harness side connector to the four wheel drive control ECU and inspect wire harness side connector from the back side, as shown.
    Fig 8: Connecting Wire Harness Side Connector To Four Wheel Drive Control ECU
    G02573208Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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