Inspection [08/2015 - 08/2019]: Procedure

1. Turn the ignition switch to ON.
2. Move the shift lever to N (vehicle is stopped).
3. Change the transfer position switch from H4L to L4L.
4. Check the 4LO indicator light.

   OK

   4LO indicator light comes on or 4LO indicator light comes on after blinking.

   If the result is not as specified, inspect the switch, four wheel drive control ECU and transfer shift actuator assembly. 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 DIAGNOSIS SYSTEM [08/2015 - 08/2019] ). Then check the combination meter (Refer to PROBLEM SYMPTOMS TABLE [08/2015 - 08/2019] ).

1. Turn the ignition switch to ON.
2. Change the transfer position switch from H4F to H4L.
3. Check the center differential lock indicator light.

   OK

   Center differential lock indicator light comes on or Center differential lock indicator light comes on after blinking

   If the result is not as specified, inspect the switches, four wheel drive control ECU, transfer and shift 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 DIAGNOSIS SYSTEM [08/2015 - 08/2019] ). Then check the combination meter (Refer to PROBLEM SYMPTOMS TABLE [08/2015 - 08/2019] ).

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

If the result is not as specified, inspect the harness, fuse or connector. If the harness or connector is malfunctioning, repair or replace the harness or connector. If the harness or connector is normal, replace the four wheel drive control ECU (Refer to REMOVAL [08/2015 - ] ).

Standard resistance

If the result is not as specified, repair or replace the harness or connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

If the result is not as specified, check the power supply. If the power supply is normal, inspect the transfer position switch (Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2019] ).

1. Disconnect the B47 actuator connector.
2. Disconnect the F47 and F46 ECU connectors.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   F47-7 (TL2) - B47-4 (TL2)	Always	Below 1 Ω
   F47-7 (TL2) - Body ground	Always	100 kΩ or higher
   F47-8 (TL3) - B47-5 (TL3)	Always	Below 1 Ω
   F47-8 (TL3) - Body ground	Always	100 kΩ or higher
   F47-14 (P1) - B47-9 (CDL)	Always	Below 1 Ω
   F47-14 (P1) - Body ground	Always	100 kΩ or higher
   F46-7 (TM2) - B47-1 (TM2)	Always	Below 1 Ω
   F46-7 (TM2) - Body ground	Always	100 kΩ or higher
   F46-8 (TM1) - B47-2 (TM1)	Always	Below 1 Ω
   F46-8 (TM1) - Body ground	Always	100 kΩ or higher
   B47-6 (GND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a

   Front view of wire harness connector (to Four Wheel Drive Control ECU)

   *b

   Front view of wire harness connector (to Transfer Shift Actuator Assembly)

   If the result is not as specified, repair or replace the harness or connector. If the harness or connector is normal, check the ECU output voltage.

1. Connect the F47 and F46 ECU connectors.
2. Connect the B47 actuator connector.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   F46-8 (TM1) - F46-4 (GND)	Ignition switch ON Transfer position switch H4F → H4L (During operation of multi mode transfer shift actuator motor from FREE to LOCK)	10 to 14 V
   	Ignition switch ON Transfer position switch H4F → H4L (Multi mode transfer shift actuator motor stopped)	Below 1.5 V
   F46-7 (TM2) - F46-4 (GND)	Ignition switch ON Transfer position switch H4L → H4F (During operation of multi mode transfer shift actuator motor from LOCK to FREE)	10 to 14 V
   	Ignition switch ON Transfer position switch H4L → H4F (Multi mode transfer shift actuator motor stopped)	Below 1.5 V
   F47-7 (TL2) - F46-4 (GND)	Ignition switch ON Transfer position switch H4L or L4L	Below 1.5 V
   	Ignition switch ON Transfer position switch H4F	10.5 to 14 V
   F47-8 (TL3) - F46-4 (GND)	Ignition switch ON Transfer position switch H4L or L4L	10.5 to 14 V
   	Ignition switch ON Transfer position switch H4F	Below 1.5 V
   F47-14 (P1) - F46-4 (GND)	Ignition switch ON Transfer position switch H4F	9.5 to 14 V
   	Ignition switch ON Transfer position switch H4L or L4L	Below 1.5 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Four Wheel Drive Control ECU)

   If the result is not as specified, determine if a malfunction is on the ECU side or actuator side by disconnecting the connector of the transfer shift actuator, and then check the ECU output voltage.

1. Disconnect the B47 actuator connector.
2. Connect the F47 and F46 ECU connectors.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   B47-9 (CDL) - B47-6 (GND1)	Ignition switch ON	9.5 to 14 V
   B47-4 (TL2) - B47-6 (GND1)	Ignition switch ON	10.5 to 14 V
   B47-5 (TL3) - B47-6 (GND1)	Ignition switch ON	10.5 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Transfer Shift Actuator Assembly)

   If the result is not as specified, replace the four wheel drive control ECU (Refer to REMOVAL [08/2015 - ] ). If the voltage is normal, inspect the multi mode transfer shift actuator, because the voltage applied to the motor cannot be measured.

1. Remove the transfer shift actuator assembly (Refer to DISASSEMBLY [08/2015 - ] ).
2. 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.

   NOTE:

   • 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, 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 performing the operation described above, use the stop LP relay.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   1. After the LOCK to FREE switch is complete, inspect the center differential lock detection switch and limit switch.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      4 (TL2) - 6 (GND1)	After LOCK to FREE switch is complete	0.5 MΩ or higher
      5 (TL3) - 6 (GND1)	After LOCK to FREE switch is complete	Below 12.5 Ω
      9 (CDL) - 10 (GND)	After LOCK to FREE switch is complete	0.5 MΩ or higher

      TEXT IN ILLUSTRATION
      
      

      *1	Stop LP Relay	-	-
      *a	Component without harness connected (Transfer Shift Actuator Assembly)	*b	LOCK to FREE

3. 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.

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   1. After the FREE to LOCK switch is complete, inspect the center differential lock detection switch and limit switch.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      4 (TL2) - 6 (GND1)	After FREE to LOCK switch is complete	Below 12.5 Ω
      5 (TL3) - 6 (GND1)	After FREE to LOCK switch is complete	0.5 MΩ or higher
      9 (CDL) - 10 (GND)	After FREE to LOCK switch is complete	Below 12.5 Ω

      TEXT IN ILLUSTRATION
      
      

      *1	Stop LP Relay	-	-
      *a	Component without harness connected (Transfer Shift Actuator Assembly)	*b	FREE to LOCK

      If the result is not as specified, replace the transfer shift actuator assembly (Refer to DISASSEMBLY [08/2015 - ] ). If the transfer shift actuator assembly is normal, replace the four wheel drive control ECU (Refer to REMOVAL [08/2015 - ] ).

1. Disconnect the B47 actuator connector.
2. Disconnect the F47 and F46 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   F47-1 (HL1) - B47-12 (HL1)	Always	Below 1 Ω
   F47-1 (HL1) - Body ground	Always	100 kΩ or higher
   F47-2 (HL2) - B47-11 (HL2)	Always	Below 1 Ω
   F47-2 (HL2) - Body ground	Always	100 kΩ or higher
   F46-2 (HM1) - B47-8 (HM1)	Always	Below 1 Ω
   F46-2 (HM1) - Body ground	Always	100 kΩ or higher
   F46-6 (HM2) - B47-7 (HM2)	Always	Below 1 Ω
   F46-6 (HM2) - Body ground	Always	100 kΩ or higher
   B47-10 (GND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a

   Front view of wire harness connector (to Four Wheel Drive Control ECU)

   *b

   Front view of wire harness connector (to Transfer Shift Actuator Assembly)

   If the result is not as specified, repair or replace the harness or connector. If the harness or connector is normal, check the ECU output voltage.

1. Connect the F47 and F46 ECU connectors.
2. Connect the B47 actuator connector.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   F46-6 (HM2) - F46-4 (GND)	Ignition switch ON Transfer position switch L4L → H4L (During operation of high-low transfer shift actuator motor from LOW to HIGH)	10 to 14 V
   	Ignition switch ON Transfer position switch L4L → H4L (High-low transfer shift actuator motor stopped)	Below 1.5 V
   F46-2 (HM1) - F46-4 (GND)	Ignition switch ON Transfer position switch H4L → L4L (During operation of high-low transfer shift actuator motor from HIGH to LOW)	10 to 14 V
   	Ignition switch ON Transfer position switch H4L → L4L (High-low transfer shift actuator motor stopped)	Below 1.5 V
   F47-1 (HL1) - F46-4 (GND)	Ignition switch ON Transfer position switch H4F or H4L	10.5 to 14 V
   	Ignition switch ON Transfer position switch L4L	Below 1.5 V
   F47-2 (HL2) - F46-4 (GND)	Ignition switch ON Transfer position switch H4F or H4L	Below 1.5 V
   	Ignition switch ON Transfer position switch L4L	10.5 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Four Wheel Drive Control ECU)

   If the result is not as specified, determine if the malfunction is on the ECU side or actuator side by disconnecting the connector of the high-low transfer shift actuator, and then checking the ECU output voltage.

1. Connect the F47 and F46 ECU connectors.
2. Disconnect the B47 actuator connector.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   B47-11 (HL2) - B47-10 (GND)	Ignition switch ON	10.5 to 14 V
   B47-12 (HL1) - B47-10 (GND)	Ignition switch ON	10.5 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Transfer Shift Actuator Assembly)

   If the result is not as specified, replace the four wheel drive control ECU (Refer to REMOVAL [08/2015 - ] ). If the voltage is normal, inspect the high-low transfer shift actuator, because the voltage applied to the motor cannot be measured.

1. Remove the transfer shift actuator assembly (Refer to DISASSEMBLY [08/2015 - ] ).
2. Check the HIGH to LOW switch.

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

   NOTE:

   • 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, 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 performing the operation described above, use the stop LP relay.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   1. After the HIGH to LOW switch is complete, inspect the limit switch.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      12 (HL1) - 10 (GND)	After HIGH to LOW switch is complete	Below 12.5 Ω
      11 (HL2) - 10 (GND)	After HIGH to LOW switch is complete	0.5 MΩ or higher

      TEXT IN ILLUSTRATION
      
      

      *1	Stop LP Relay	-	-
      *a	Component without harness connected (Transfer Shift Actuator Assembly)	*b	HIGH to LOW

3. Check the LOW to HIGH switch.

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

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   1. After the LOW to HIGH switch is complete, inspect the limit switch.

      Standard resistance

      Tester Connection	Condition	Specified Condition
      12 (HL1) - 10 (GND)	After LOW to HIGH switch is complete	0.5 MΩ or higher
      11 (HL2) - 10 (GND)	After LOW to HIGH switch is complete	Below 12.5 Ω

      TEXT IN ILLUSTRATION
      
      

      *1	Stop LP Relay	-	-
      *a	Component without harness connected (Transfer Shift Actuator Assembly)	*b	LOW to HIGH

      If the result is not as specified, replace the transfer shift actuator assembly (Refer to DISASSEMBLY [08/2015 - ] ). If the transfer shift actuator assembly is normal, replace the four wheel drive control ECU (Refer to REMOVAL [08/2015 - ] ).