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Automatic Disconnecting Differential Control System: Inspection

  1. INSPECT A.D.D. ACTUATOR 
    1. Disconnect the actuator connector.
    2. Measure the resistance between the terminals 2 and 6.
      1. Standard resistance: 0.3 - 100 Ω 
    3. Measure the resistance between the terminals 2 or 6 and body ground.
    1. Standard resistance: More than 0.5 MΩ 

    If the resistance value is not as specified, replace the actuator assembly.

    Fig 1: Identifying Actuator Connector Terminal
    G02927690Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT A.D.D. ACTUATOR OPERATION 

    Apply battery positive voltage between the terminal 2 or 6, and check the actuator operation by sound, A.D.D. status and continuity between the terminal 3 and 4.

    ADD ACTUATOR OPERATION CONTINUITY

    Battery voltage applied terminal 3 - 4 terminals continuity A.D.D. status
    2 (+) - 6 (-) Continuity Connected
    2 (-) - 6 (+) No continuity Disconnected

    If the operation is not as specified, replace the actuator assembly.

  3. INSPECT LIMIT SWITCH CONTINUITY 
    1. Connect the actuator connector.
    2. Shift the transfer shift lever "H" position and switch the 2 - 4 selector switch OFF.
    3. Check the A.D.D. actuator operation by sound.
    4. Disconnect the actuator connector.
    5. Check the continuity between each terminal, as shown in the chart.
      Fig 2: Checking Continuity Between Each Terminal (Switch Off)
      G02927691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL SPECIFIED CONDITION

      Tester connected terminal number Specified condition
      1 - 3 Continuity
      1 - 4 No continuity
      3 - 5 No continuity
      4 - 5 No continuity
    6. Connect the actuator connector.
    7. Shift the transfer shift lever "H" position and switch the 2 - 4 selector switch ON.
    8. Check the A.D.D. actuator operation by sound.
    9. Disconnect the actuator connector.
    10. Check the continuity between each terminal, as shown in the chart.
      Fig 3: Checking Continuity Between Each Terminal (Switch On)
      G02927692Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL SPECIFIED CONDITION

      Tester connected terminal number Specified condition
      1 - 3 No continuity
      1 - 4 No continuity
      3 - 5 Continuity
      4 - 5 No continuity
    11. Connect the actuator connector.
  4. INSPECT TRANSFER 4WD POSITION SWITCH (See  INSPECTION  ) 
  5. REMOVE A.D.D. ACTUATOR (See  DISASSEMBLY  ) 
  6. INSPECT CLUTCH HUB AND CLUTCH SLEEVE 
    1. Check the clutch hub and clutch sleeve for wear and damage.

      If necessary, replace them.

    2. Check that clutch sleeve slides smoothly on the clutch hub.
      Fig 4: Checking Clutch Sleeve Slides Smoothly On Clutch Hub
      G02927693Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. MEASURE SLEEVE FORK AND CLUTCH SLEEVE CLEARANCE 

    Using a feeler gauge, measure the clearance between the sleeve fork and clutch sleeve.

    1. Maximum clearance: 0.35 mm (0.0138 in.) 

    If the clearance exceeds the maximum, replace the fork or sleeve.

    Fig 5: Measuring Clearance Between Sleeve Fork & Clutch Sleeve
    G02927694Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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