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On-Vehicle Inspection

  1. INSPECT INDICATOR LIGHT 
    1. 4HI Indicator Light:
      1. Turn the ignition switch ON.
      2. Change the 4WD control switch from 2WD to 4H.
      3. Check the 4HI indicator light.
        Fig 1: Changing 4WD Control Switch From 2WD To 4H
        GTY203298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        OK

        Switch Condition Specified Condition
        2WD to 4H 4HI indicator light comes on or 4HI indicator light comes on after it is blinking

        If there is a malfunction, inspect the switch, ECU, transfer shift actuator and A.D.D. actuator. If the system is normal, there may be a malfunction in the CAN communication system or combination meter. In this case, first check the CAN communication system. Refer to PRECAUTION . Then check the combination meter. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

    2. 4LO Indicator Light:
      1. Turn the ignition switch ON.
      2. Change the 4WD control switch from 2WD to 4H. Then change it from 4H to 4L after the 4HI indicator light illuminates (after 4H switch completion).
      3. Check the 4LO indicator light.
        Fig 2: Inspecting Fuse (4WD)
        GTY203297Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        OK

        Switch Condition Specified Condition
        After 2WD to 4WD HIGH switch completion, 4H to 4L 4LO indicator light comes on or 4LO indicator light comes on after it is blinking

        If there is a malfunction, inspect the switch, ECU and actuator. If the system is normal, the combination meter may be malfunctioning.

  2. INSPECT FUSE (4WD) 
    1. Remove the 4WD fuse from the main body ECU.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      4WD fuse Always Below 1 Ω

      If a fuse is blown, inspect the harness connected to the fuse for a short circuit, and repair or replace the harness or replace the fuse.

  3. INSPECT 4WD CONTROL ECU (POWER SUPPLY) 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 3: Checking 4WD Control ECU (Power Supply) With Connector End View
      GTY203425Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      A26-3 (IG) - Body ground Ignition switch ON 11 to 14 V

      If there is a malfunction, inspect the harness or connector. If the harness is malfunctioning, repair or replace harness or connector. If the harness or connector is normal, replace the 4WD control ECU. Refer to REMOVAL .

    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      A26-4 (GND) - Body ground Always Below 1 Ω

      If there is a malfunction, repair or replace the harness or connector.

  4. INSPECT 4WD CONTROL ECU (4WD CONTROL SWITCH) 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 4: Checking 4WD Control ECU (4WD Control Switch) With Connector End View
      GTY179483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      A25-11 (2-4) - Body ground Ignition switch ON
      4WD control switch 2WD position      		 Below 1.5 V
      Ignition switch ON
      4WD control switch 4H position      		 Below 1.5 V
      Ignition switch ON
      4WD control switch 4L position      		 10.5 to 14 V
      A25-13 (LO) - Body ground Ignition switch ON
      4WD control switch 2WD position      		 10.5 to 14 V
      Ignition switch ON
      4WD control switch 4H position      		 Below 1.5 V
      Ignition switch ON
      4WD control switch 4L position      		 Below 1.5 V

      If there is a malfunction, check the power supply. If the power supply is normal, inspect the 4WD control switch. Refer to ON-VEHICLE INSPECTION .

  5. INSPECT 2WD-4WD TRANSFER SHIFT ACTUATOR 

    HINT: 

    After inspecting the power supply or 4WD control switch, inspect the 2WD-4WD transfer shift actuator.

    1. Check the harness and connector (ECU - 2WD-4WD transfer shift actuator).
      1. Disconnect the D67 actuator connector.
      2. Disconnect the A25 and A26 ECU connectors.
      3. Measure the resistance according to the value(s) in the table below.
        Fig 5: Checking 2WD - 4WD Transfer Shift Actuator With Connector End View
        GTY189022Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance

        Tester Connection Condition Specified Condition
        A25-6 (TL1) - D67-4 (TL1) Always Below 1 Ω
        A25-6 (TL1) - Body ground Always 10 kΩ or higher
        A25-8 (TL3) - D67-5 (TL3) Always Below 1 Ω
        A25-8 (TL3) - Body ground Always 10 kΩ or higher
        A25-14 (4WD) - D67-3 (CDL) Always Below 1 Ω
        A25-14 (4WD) - Body ground Always 10 kΩ or higher
        A26-7 (TM2) - D67-2 (TM2) Always Below 1 Ω
        A26-7 (TM2) - Body ground Always 10 kΩ or higher
        A26-8 (TM1) - D67-1 (TM1) Always Below 1 Ω
        A26-8 (TM1) - Body ground Always 10 kΩ or higher
        D67-7 (GND1) - Body ground Always Below 1 Ω

        If there is a malfunction, repair or replace harness or connector. If the harness or connector is normal, check the ECU output voltage.

    2. Check the 4WD control ECU (2WD-4WD transfer shift actuator).
      1. Connect the A25 and A26 ECU connectors.
      2. Connect the D67 actuator connector.
      3. Measure the voltage according to the value(s) in the table below.
        Fig 6: Checking 4WD Control ECU (Transfer Shift Actuator) With A25 & A26 Connector End View
        GTY203426Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard voltage

        Tester Connection Switch Condition Specified Condition
        A26-8 (TM1) - A26-4 (GND) Ignition switch ON
        4WD control switch 2WD → 4H position
        (during transfer shift actuator 2WD to 4WD HIGH switching operation)        		 10 to 14 V
        Ignition switch ON
        4WD control switch 2WD → 4H position
        (transfer shift actuator 2WD to 4WD HIGH switching operation stopped)        		 Below 1.5 V
        A26-7 (TM2) - A26-4 (GND) Ignition switch ON
        4WD control switch 4H → 2WD position
        (during transfer shift actuator 4WD HIGH to 2WD switching operation)        		 10 to 14 V
        Ignition switch ON
        4WD control switch 4H → 2WD position
        (transfer shift actuator 4WD HIGH to 2WD switching operation stopped)        		 Below 1.5 V
        A25-6 (TL1) - A26-4 (GND) Ignition switch ON
        4WD control switch 2WD position        		 Below 1.5 V
        Ignition switch ON
        4WD control switch 2WD → 4H position        		 10.5 to 14 V
        A25-8 (TL3) - A26-4 (GND) Ignition switch ON
        4WD control switch 2WD position        		 11 to 14 V
        Ignition switch ON
        4WD control switch 2WD → 4H position        		 Below 1.5 V
        A25-14 (4WD) - A26-4 (GND) Ignition switch ON
        4WD control switch 2WD position        		 9.5 to 14 V
        Ignition switch ON
        4WD control switch 2WD → 4H position        		 Below 1.5 V

        If there is a malfunction, determine if the malfunction is on the ECU side or the actuator side by disconnecting the connector of the 2WD-4WD transfer shift actuator, and then checking the ECU output voltage.

    3. Check the 4WD control ECU.
      1. Disconnect the D67 actuator connector.
      2. Connect the A25 and A26 ECU connectors.
      3. Measure the voltage according to the value(s) in the table below.
        Fig 7: Checking 4WD Control ECU (Transfer Shift Actuator) With D67 Connector End View
        GTY177596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard voltage

        Tester Connection Switch Condition Specified Condition
        D67-3 (CDL) - D67-7 (GND1) Ignition switch ON 9.5 to 14 V
        D67-4 (TL1) - D67-7 (GND1) Ignition switch ON 10.5 to 14 V
        D67-5 (TL3) - D67-7 (GND1) Ignition switch ON 10.5 to 14 V

        If there is a malfunction, replace the 4WD control ECU. Refer to REMOVAL . If the voltage is normal, inspect the 2WD-4WD transfer shift actuator, as the voltage applied to the motor cannot be measured.

    4. Inspect the 2WD-4WD transfer shift actuator.
      1. Remove the transfer shift actuator. Refer to DISASSEMBLY .
      2. Check the 2WD to 4WD HIGH switch.

        Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the 2WD to 4WD HIGH position.

        NOTE:
        • Make sure to perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.
        • When inspecting the actuator, make sure to operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.

        HINT: 

        When inspecting the operation described above, use the BACK P/W NO. 2 relay.

        Fig 8: Checking 2WD to 4WD High Switch Operation
        GTY182523Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        1. After the 2WD to 4WD HIGH switch is complete, inspect the 4WD detection switch and limit switch.

          Standard resistance

          Tester Connection Condition Specified Condition
          3 (CDL) - 7 (GND1) After 2WD to 4WD HIGH switch is complete Below 1 Ω
          4 (TL1) - 7 (GND1) After 2WD to 4WD HIGH switch is complete 100 kΩ or higher
          5 (TL3) - 7 (GND1) After 2WD to 4WD HIGH switch is complete Below 1 Ω
      3. Check the 4WD HIGH to 2WD switch.

        Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the 4WD HIGH to 2WD position.

        Fig 9: Checking 4WD High To 2WD Switch Operation
        GTY169758Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        1. After the 4WD HIGH to 2WD switch is complete, inspect the 4WD detection switch and limit switch.

          Standard resistance

          Tester Connection Condition Specified Condition
          3 (CDL) - 7 (GND1) After 4WD HIGH to 2WD switch is complete 100 kΩ or higher
          4 (TL1) - 7 (GND1) After 4WD HIGH to 2WD switch is complete Below 1 Ω
          5 (TL3) - 7 (GND1) After 4WD HIGH to 2WD switch is complete 100 kΩ or higher

          If there is a malfunction, replace the transfer shift actuator. Refer to DISASSEMBLY . If the transfer shift actuator is normal, replace the 4WD control ECU. Refer to REMOVAL .

  6. INSPECT A.D.D. ACTUATOR 

    HINT: 

    After inspecting the 2WD-4WD transfer shift actuator, inspect the A.D.D. actuator.

    1. Check the harness and connector (ECU - A.D.D. actuator).
      1. Disconnect the A25 and A26 ECU connectors.
      2. Disconnect the G1 actuator connector.
      3. Measure the resistance according to the value(s) in the table below.
        Fig 10: Checking A.D.D. Actuator With G1 Connector End View
        GTY203478Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance

        Tester Connection Condition Specified Condition
        A25-9 (DL1) - G1-6 (DL1) Always Below 1 Ω
        A25-9 (DL1) - Body ground Always 100 kΩ or higher
        A25-10 (DL2) - G1-5 (DL2) Always Below 1 Ω
        A25-10 (DL2) - Body ground Always 100 kΩ or higher
        A25-15 (ADD) - G1-3 (ADD) Always Below 1 Ω
        A25-15 (ADD) - Body ground Always 100 kΩ or higher
        A26-1 (DM1) - G1-1 (DM1) Always Below 1 Ω
        A26-1 (DM1) - Body ground Always 100 kΩ or higher
        A26-5 (DM2) - G1-2 (DM2) Always Below 1 Ω
        A26-5 (DM2) - Body ground Always 100 kΩ or higher
        G1-4 (GND) - Body ground Always Below 1 Ω

        If there is a malfunction, repair or replace harness or connector. If the harness or connector is normal, check the ECU output voltage.

    2. Check the 4WD control ECU (A.D.D. actuator).
      1. Connect the A25 and A26 ECU connectors.
      2. Connect the G1 actuator connector.
      3. Measure the voltage according to the value(s) in the table below.
        Fig 11: Measuring Voltage Of 4WD Control ECU (A.D.D. Actuator)
        GTY203427Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard voltage

        Tester Connection Switch Condition Specified Condition
        A26-5 (DM2) - A26-4 (GND) Ignition switch ON
        4WD control switch 2WD → 4H position
        (during A.D.D. actuator Free to Lock operation)        		 10 to 14 V
        Ignition switch ON
        4WD control switch 2WD → 4H position
        (A.D.D. actuator Free to Lock operation stopped)        		 Below 1.5 V
        A26-1 (DM1) - A26-4 (GND) Ignition switch ON
        4WD control switch 4H → 2WD position
        (during A.D.D. actuator Lock to Free operation)        		 10 to 14 V
        Ignition switch ON
        4WD control switch 4H → 2WD position
        (A.D.D. actuator Lock to Free operation stopped)        		 Below 1.5 V
        A25-9 (DL1) - A26-4 (GND) Ignition switch ON
        4WD control switch 2WD position (A.D.D. actuator Free)        		 10.5 to 14 V
        Ignition switch ON
        4WD control switch 2WD → 4H position (A.D.D. actuator Lock)        		 Below 1.5 V
        A25-10 (DL2) - A26-4 (GND) Ignition switch ON
        4WD control switch 2WD position (A.D.D. actuator Free)        		 Below 1.5 V
        Ignition switch ON
        4WD control switch 2WD → 4H position (A.D.D. actuator Lock)        		 10.5 to 14 V
        A25-15 (ADD) - A26-4 (GND) Ignition switch ON
        4WD control switch 2WD position        		 10 to 14 V
        Ignition switch ON
        4WD control switch 2WD → 4H position        		 Below 1.5 V

        If there is a malfunction, determine if the malfunction is on the ECU side or the actuator side by disconnecting the connector of the A.D.D. actuator, and then checking the ECU output voltage.

    3. Check the 4WD control ECU.
      1. Connect the A25 and A26 ECU connectors.
      2. Disconnect the G1 actuator connector.
      3. Measure the voltage according to the value(s) in the table below.
        Fig 12: Measuring Voltage Of 4WD Control ECU (A.D.D. Actuator)
        GTY203484Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard voltage

        Tester Connection Switch Condition Specified Condition
        G1-3 (ADD) - G1-4 (GND) Ignition switch ON 10 to 14 V
        G1-5 (DL2) - G1-4 (GND) Ignition switch ON 10.5 to 14 V
        G1-6 (DL1) - G1-4 (GND) Ignition switch ON 10.5 to 14 V

        If there is a malfunction, replace the 4WD control ECU. Refer to REMOVAL . If the voltage is normal, inspect the A.D.D. actuator, as the voltage applied to the motor cannot be measured.

    4. Inspect the A.D.D. actuator.
      1. Remove the A.D.D. actuator. Refer to REMOVAL .
      2. Check the Free to Lock switch.

        Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the Free to Lock position.

        NOTE:
        • Make sure to perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.
        • When inspecting the actuator, make sure to operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.

        HINT: 

        When inspecting the operation described above, use the BACK P/W NO. 2 relay.

        Fig 13: Inspecting A.D.D. Actuator (Free To Lock Switch Operation)
        GTY169133Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        1. After the Free to Lock switch is complete, inspect the A.D.D. detection switch and limit switch.

          Standard resistance

          Tester Connection Condition Specified Condition
          3 (ADD) - 4 (GND) After Free to Lock switch is complete Below 1 Ω
          5 (DL2) - 4 (GND) After Free to Lock switch is complete 100 kΩ or higher
          6 (DL1) - 4 (GND) After Free to Lock switch is complete Below 1 Ω
      3. Check the Lock to Free switch.

        Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the Lock to Free position.

        Fig 14: Inspecting A.D.D. Actuator (Lock To Free Switch Operation)
        GTY179083Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        1. After the Lock to Free switch is complete, inspect the A.D.D. detection switch and limit switch.

          Standard resistance

          Tester Connection Condition Specified Condition
          3 (ADD) - 4 (GND) After Lock to Free switch is complete 100 kΩ or higher
          5 (DL2) - 4 (GND) After Lock to Free switch is complete Below 1 Ω
          6 (DL1) - 4 (GND) After Lock to Free switch is complete 100 kΩ or higher

          If there is a malfunction, replace the A.D.D. actuator. Refer to REMOVAL . If the A.D.D. actuator is normal, replace the 4WD control ECU. Refer to REMOVAL .

  7. INSPECT HIGH-LOW TRANSFER SHIFT ACTUATOR 

    HINT: 

    Before the inspection, check that the system is switched from 2WD to 4WD normally.

    1. Check the harness and connector (ECU - actuator).
      1. Disconnect the D68 high-low transfer shift actuator connector.
      2. Disconnect the A25 and A26 ECU connector.
      3. Measure the resistance according to the value(s) in the table below.
        Fig 15: Checking High-Low Transfer Shift Actuator With D68 Connector End View
        GTY203477Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance

        Tester Connection Condition Specified Condition
        A25-1 (HL1) - D68-4 (HL1) Always Below 1 Ω
        A25-1 (HL1) - Body ground Always 100 kΩ or higher
        A25-2 (HL2) - D68-6 (HL2) Always Below 1 Ω
        A25-2 (HL2) - Body ground Always 100 kΩ or higher
        A25-3 (HL3) - D68-5 (HL3) Always Below 1 Ω
        A25-3 (HL3) - Body ground Always 100 kΩ or higher
        A25-16 (NP) - D68-3 (N) Always Below 1 Ω
        A25-16 (NP) - Body ground Always 100 kΩ or higher
        A26-2 (HM1) - D68-1 (HM1) Always Below 1 Ω
        A26-2 (HM1) - Body ground Always 100 kΩ or higher
        A26-6 (HM2) - D68-2 (HM2) Always Below 1 Ω
        A26-6 (HM2) - Body ground Always 100 kΩ or higher
        D68-7 (GND) - Body ground Always Below 1 Ω

        If there is a malfunction, repair or replace harness or connector. If the harness or connector is normal, check the ECU output voltage.

    2. Check the 4WD control ECU (high-low transfer shift actuator).
      1. Connect the A25 and A26 ECU connectors.
      2. Connect the D68 actuator connector.
      3. Measure the voltage according to the value(s) in the table below.
        Fig 16: Measuring Voltage Of 4WD Control ECU (High-Low Transfer Shift Actuator)
        GTY180448Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard voltage

        Tester Connection Switch Condition Specified Condition
        A26-6 (HM2) - A26-4 (GND) Ignition switch ON
        4WD control switch 4H → 4L position
        (during transfer shift actuator 4WD HIGH to 4WD LOW operation)        		 10 to 14 V
        Ignition switch ON
        4WD control switch 4H → 4L position
        (transfer shift actuator 4WD HIGH to 4WD LOW operation stopped)        		 Below 1.5 V
        A26-2 (HM1) - A26-4 (GND) Ignition switch ON
        4WD control switch 4L → 4H
        (during transfer shift actuator 4WD LOW to 4WD HIGH operation)        		 10 to 14 V
        Ignition switch ON
        4WD control switch 4L → 4H position
        (transfer shift actuator 4WD LOW to 4WD HIGH operation stopped)        		 Below 1.5 V
        A25-1 (HL1) - A26-4 (GND) Ignition switch ON
        4WD control switch 4H position        		 Below 1.5 V
        Ignition switch ON
        4WD control switch 4H → 4L position        		 10.5 to 14 V
        A25-2 (HL2) - A26-4 (GND) Ignition switch ON
        4WD control switch 4H position        		 10.5 to 14 V
        Ignition switch ON
        4WD control switch 4H → 4L position        		 Below 1.5 V
        A25-3 (HL3) - A26-4 (GND) Ignition switch ON
        4WD control switch 4H position        		 10.5 to 14 V
        Ignition switch ON
        1.5 seconds or less after 4WD control switch is changed from 4H to 4L        		 Below 1.5 V
        Ignition switch ON
        Over 1.5 seconds after 4WD control switch is changed from 4H to 4L        		 10.5 to 14 V
        A25-16 (NP) - A26-4 (GND) Ignition switch ON
        1.5 seconds or less after 4WD control switch is changed from 4H to 4L        		 Below 1.5 V
        Ignition switch ON
        Over 1.5 seconds after 4WD control switch is changed from 4H to 4L        		 10 to 14 V

        If there is a malfunction, determine if the malfunction is on the ECU side or the actuator side by disconnecting the connector of the high-low transfer shift actuator, and then checking the ECU output voltage.

    3. Check the 4WD control ECU.
      1. Connect the A25 and A26 ECU connectors.
      2. Disconnect the D68 actuator connector.
      3. Measure the voltage according to the value(s) in the table below.
        Fig 17: Measuring Voltage Of 4WD Control ECU (High-Low Transfer Shift Actuator)
        GTY187134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard voltage

        Tester Connection Switch Condition Specified Condition
        D68-3 (N) - D68-7 (GND) Ignition switch ON 10 to 14 V
        D68-4 (HL1) - D68-7 (GND) Ignition switch ON 10.5 to 14 V
        D68-5 (HL3) - D68-7 (GND) Ignition switch ON 10.5 to 14 V
        D68-6 (HL2) - D68-7 (GND) Ignition switch ON 10.5 to 14 V

        If there is a malfunction, replace the 4WD control ECU. Refer to REMOVAL . If the voltage is normal, inspect the high-low transfer shift actuator, as the voltage applied to the motor cannot be measured.

    4. Inspect the high-low transfer shift actuator.
      1. Remove the transfer shift actuator. Refer to DISASSEMBLY .
      2. Check the 4WD HIGH to 4WD LOW switch.

        Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the 4WD HIGH to 4WD LOW position.

        NOTE:
        • Make sure to perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.
        • When inspecting the actuator, make sure to operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.

        HINT: 

        When inspecting the operation described above, use the BACK P/W NO. 2 relay.

        Fig 18: Checking 4WD High To 4WD Low Switch Operation
        GTY186248Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        1. After the 4WD HIGH to 4WD LOW switch is complete, inspect the neutral detection switch and limit switch.

          Standard resistance

          Tester Connection Condition Specified Condition
          3 (N) - 7 (GND) After 4WD HIGH to 4WD LOW switch is complete 100 kΩ or higher
          4 (HL1) - 7 (GND) After 4WD HIGH to 4WD LOW switch is complete 100 kΩ or higher
          5 (HL3) - 7 (GND) After 4WD HIGH to 4WD LOW switch is complete 100 kΩ or higher
          6 (HL2) - 7 (GND) After 4WD HIGH to 4WD LOW switch is complete Below 1 Ω
      3. Check the 4WD LOW to 4WD HIGH switch.

        Connect lines via a relay as shown in the illustration, then check that the actuator fork moves from the 4WD LOW to 4WD HIGH position.

        Fig 19: Checking 4WD Low To 4WD High Switch Operation
        GTY171051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        1. After the 4WD LOW to 4WD HIGH switch is complete, inspect the neutral detection switch and limit switch.

          Standard resistance

          Tester Connection Condition Specified Condition
          3 (N) - 7 (GND) After 4WD LOW to 4WD HIGH switch is complete 100 kΩ or higher
          4 (HL1) - 7 (GND) After 4WD LOW to 4WD HIGH switch is complete Below 1 Ω
          5 (HL3) - 7 (GND) After 4WD LOW to 4WD HIGH switch is complete 100 kΩ or higher
          6 (HL2) - 7 (GND) After 4WD LOW to 4WD HIGH switch is complete 100 kΩ or higher

          If there is a malfunction, replace the transfer shift actuator. Refer to DISASSEMBLY . If the transfer shift actuator is normal, replace the 4WD control ECU. Refer to REMOVAL .

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