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Select High-Low System (VF4BM): Inspection

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:
  • 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: Checking Center Diff Lock Indicator Light Switch
      G04338729Courtesy 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: Checking 4LO Indicator Light Comes On After Blinking
      G04338730Courtesy 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: Checking 4LO Indicator Light Goes Off After Blinking (1 Of 2)
      G04338731Courtesy 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: Checking 4LO Indicator Light Goes Off After Blinking (2 Of 2)
      G04338732Courtesy 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.
      SWITCH POSITION SPECIFIED CONDITION

      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: Removing Differential Lock Switch From Instrument Panel Finish Lower Sub-Assy
      G04338733Courtesy 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.
      SWITCH POSITION SPECIFIED CONDITION

      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: Removing Center Instrument Cluster Finish Panel Sub-Assy
      G04338734Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. INSPECT ACTUATOR 
    NOTE: Inspection for the actuator must be done with the actuator installed on the transfer assembly.
    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 WIRE HARNESS SPECIFIED CONDITION

      Tester connection Specified condition
      TM1 (F10-2) - TM1 (T3-2) Continuity
      TM2 (F10-5) - TM2 (T3-1) Continuity
      TL2 (F10-24) - TL2 (T3-4) Continuity
      TL3 (F10-23) - TL3 (T3-5) Continuity
      HM2 (F10-4) - HM2 (T3-7) Continuity
      HM1 (F10-1) - HM1 (T3-8) Continuity
      P1 (F10-22) - CDL (T3-9) Continuity
      HL2 (F10-26) - HL2 (T3-11) Continuity
      HL1 (F10-17) - HL1 (T3-12) Continuity

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

      Fig 7: Disconnecting Actuator Connector & Four Wheel Drive Control ECU Connector
      G04338735Courtesy 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
      G04338736Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

STANDARD VALUE OF ECU TERMINAL 

STANDARD VALUE OF ECU TERMINAL

Terminals (Symbols) Condition STD Voltage (V)
F9-9 (SPD) - F9-1 (GND) During driving Pulse generation
F9-22 (N) - F9-1 (GND)
  • Ignition switch ON
  • Transmission shift lever other position --> Transmission shift lever N position
 10 - 14 --> 2 or less
F9-16 (DL) - F9-1 (GND)
  • Ignition switch ON
  • Differential lock switch is in "OFF" position --> Keep pressing the differential lock switch approx. 2 seconds to turn it ON
 10 - 14 --> 2 or less
F10-23 (TL3) - F9-1 (GND)
  • Ignition switch ON
  • Differential lock switch is in "OFF" position --> Keep pressing the differential lock switch approx. 2 seconds to turn it ON
 2 or less --> 10 - 14
F9-6 (IG) - F9-1 (GND) Ignition switch ON 10 - 14
F10-2 (TM1) - F10-5 (TM2)
  • Ignition switch ON
  • Differential lock switch is in "OFF" position
 10 - 14 (for about 5 seconds) then less than 0.5
  • Ignition switch ON
  • Keep pressing the differential lock switch approx. 2 seconds to turn it ON
F9-15 (LO) - F9-1 (GND)
  • Ignition switch ON
  • Four wheel drive control switch "H4" position --> Four wheel drive control switch "L4" position
 10 - 14 --> 2 or less
F9-20 (IND2) - F9-1 (GND)
  • Ignition switch ON
  • Differential lock switch is in "OFF" position --> Keep pressing the differential lock switch approx. 2 seconds to turn it ON
 10 - 14 --> 1.5 - 3.5
F9-11 (IND3) - F9-1 (GND)
  • Ignition switch ON
  • Four wheel drive control switch "H4" position --> Four wheel drive control switch "L4" position
 10 - 14 --> 1.5 - 3.5
F10-24 (TL2) - F9-1 (GND)
  • Ignition switch ON
  • Differential lock switch is in "OFF" position --> Keep pressing the differential lock switch approx. 2 seconds to turn it ON
 10 - 14 --> 2 or less
F9-1 (GND) - Body ground Ignition switch OFF Continuity
F9-24 (L4) - F9-1 (GND)
  • Ignition switch ON
  • Four wheel drive control switch "H4" position --> Four wheel drive control switch "L4" position
 10 - 14 --> 2 or less
F10-1 (HM1) - F9-1 (GND)
  • Ignition switch ON
  • Four wheel drive control switch "H4" position --> Four wheel drive control switch "L4" position
 10 - 14 --> 2 or less
F10-4 (HM2) - F9-1 (GND)
  • Ignition switch ON
  • Four wheel drive control switch "H4" position --> Four wheel drive control switch "L4" position
 2 or less --> 10 - 14
F10-17 (HL1) - F9-1 (GND)
  • Ignition switch ON
  • Four wheel drive control switch "H4" position --> Four wheel drive control switch "L4" position
 10 - 14 --> 2 or less
F10-26 (HL2) - F9-1 (GND)
  • Ignition switch ON
  • Four wheel drive control switch "H4" position --> Four wheel drive control switch "L4" position
 2 or less --> 10 - 14
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