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Select 2-4 And High-Low System (VF4AM): 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:
  • H4 <=> L4: Stop the vehicle and apply brake, then shift the transmission shift lever into "N" position first.
  • Do not operate the four wheel drive control switch and the differential lock switch at the same time.
  • Do not change from 2WD to 4WD when the vehicle speed is 100 km/h or more.
  1. INSPECT H2 (2WD) <=> H4 (4WD and Differential lock "FREE(" SHIFT 
    1. Start the engine, and the differential lock switch is in "OFF" position.
    2. Turn the four wheel drive control switch from the "H2" position to the "H4" position.
    3. Check that the 4WD indicator light comes on after it is blinking. (The center diff. lock indicator blinks while shifting.)
    4. Turn the four wheel drive control switch from the "H4" position to the "H2" position. (The center diff. lock indicator blinks while shifting.)
    5. Check that the 4WD indicator light goes off after it is blinking.
    Fig 1: Inspecting H2 (2WD)
    G02573211Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT H4 (4WD and Differential lock "LOCK(" --> H2 (2WD) 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 "H2" position.
    4. Check that the 4WD indicator light and center diff. lock indicator light goes off after those are blinking.
    Fig 2: Inspecting H4 (4WD And Differential Lock "Lock")
    G02573212Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT H4 (4WD and Differential lock "FREE(" <=> H4 (4WD and 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 3: Inspecting H4 (4WD And Differential Lock "Free")
    G02573213Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT L4 (4WD and Differential lock "FREE(" <=> L4 (4WD and 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 4: Inspecting L4 (4WD And Differential Lock "Free")
    G02573214Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT H4 (4WD and Differential lock "FREE(" <=> L4 (4WD and 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 5: Inspecting H4 (4WD And Differential Lock "Free")
    G02573215Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSPECT H4 (4WD and Differential lock "LOCK(" <=> L4 (4WD and 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 6: Inspecting H4 (4WD And Differential Lock "Lock")
    G02573216Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. INSPECT H2 (2WD) --> L4 (4WD and 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 "H2" position to the "H4" position.
    3. Check that the 4WD indicator light comes on after it is blinking. (The center diff. lock indicator blinks while shifting.)
    4. Turn the four wheel drive control switch from the "H4" position to the "L4" position while pressing it.
    5. Check that the 4LO indicator light comes on after it is blinking.
    Fig 7: Inspecting H2 (2WD)
    G02573217Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSPECT L4 (4WD and Differential lock "FREE(" --> H2 (2WD) SHIFT 
    1. Start the engine, and differential lock switch is in "OFF" position.
    2. Turn the four wheel drive control switch from the "L4" position to the "H4" position while pressing it.
    3. Check that the 4LO indicator light goes off after it is blinking.
    4. Turn the four wheel drive control switch from the "H4" position to the "H2" position.
    5. Check that the 4WD indicator light goes off after it is blinking. (The center diff. lock indicator blinks while shifting.)
    Fig 8: Inspecting L4 (4WD And Differential Lock "Free")
    G02573218Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. INSPECT L4 (4WD and Differential lock "LOCK(" --> H2 (2WD) 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 "L4" position to the "H4" position while pressing it.
    4. Check that the 4LO indicator light goes off after it is blinking.
    5. Turn the four wheel drive control switch from the "H4" position to the "H2" position.
    6. Check that the 4WD indicator light and center diff. lock indicator light goes off after those are blinking.
    Fig 9: Inspecting L4 (4WD And Differential Lock "Lock")
    G02573219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. 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 2)

    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 10: Inspecting Continuity Between Terminal
    G02573220Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. 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.
    Fig 11: Switch Position Specification
    G02573221Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    Fig 12: Inspecting Four Wheel Drive Control Switch
    G02573222Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. 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.

  13. 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 (2 OF 2)

    Tester connection Specified condition
    TM1 (A-2) - TM1 (B-2) Continuity
    TM2 (A-5) - TM2 (B-1) Continuity
    TL1 (A-41) - TL1 (B-3) 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 13: Disconnecting Actuator Connector And Four Wheel Drive Control ECU Connector
    G02573223Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. 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 14: Inspecting Four Wheel Drive Control ECU
    G02573224Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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