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4WD Control System / Transfer Case Control System: Inspection: Inspection

WARNING: This page is about a different car, the 2010 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  1. TRANSFER SYSTEM 
    NOTE:
    • To shift from H2 to H4, move the transfer shift lever while keeping the wheels facing straight ahead.
    • To shift from H4 to L4, stop the vehicle, move the shift lever to N and then move the transfer shift lever.
    • To shift from L4 to H4, stop the vehicle, move the shift lever to N and then move the transfer shift lever.
  2. INSPECT INDICATOR LIGHT 
    1. 4WD Indicator Light:
      1. Start the engine.
      2. Move the transfer shift lever from the H2 position to the H4, L4 or N position.
      3. Check that the 4WD indicator light illuminates.

        OK

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

        If the result is not as specified, inspect the transfer indicator switch (4WD position) and four wheel drive control ECU. 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 . Then check the combination meter. Refer to PROBLEM SYMPTOMS TABLE .

    2. 4LO Indicator Light:
      1. Turn the ignition switch to ON.
      2. Move the shift lever to N (vehicle is stopped).
      3. Move the transfer shift lever from the H2, H4 or N position to the L4 position.
      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 transfer indicator switch (L4 position) and four wheel drive control ECU. 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 PROBLEM SYMPTOMS TABLE . Then check the combination meter. Refer to PROBLEM SYMPTOMS TABLE .

  3. INSPECT FOUR WHEEL DRIVE CONTROL ECU (POWER SUPPLY) 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 1: Identifying Four Wheel Drive Control ECU (Power Supply)
      GTY224756Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Four Wheel Drive Control ECU)

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      F46-3 (IG) - Body ground Ignition switch ON 11 to 14 V

      If the result is not as specified, inspect the fuse, harness 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 .

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

      Standard resistance

      Tester Connection Condition Specified Condition
      A29-4 (GND) - Body ground Always Below 1 Ω

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

  4. INSPECT FOUR WHEEL DRIVE CONTROL ECU (TRANSFER INDICATOR SWITCH) 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 2: Identifying Four Wheel Drive Control ECU (Transfer Indicator Switch)
      GTY221201Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Four Wheel Drive Control ECU)

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      F47-2 (4WDL) - Body ground Ignition switch ON
      Transfer shift lever position H2 or H4      		 10.5 to 14 V
      Ignition switch ON
      Transfer shift lever position L4 or N      		 Below 1.5 V
      F47-3 (4WD) - Body ground Ignition switch ON
      Transfer shift lever position H2      		 10.5 to 14 V
      Ignition switch ON
      Transfer shift lever position H4, L4 or N      		 Below 1.5 V
      F47-16 (NP) - Body ground Ignition switch ON
      Transfer shift lever position N      		 Below 1.5 V
      Ignition switch ON
      Transfer shift lever position not N      		 9.5 to 14 V

      If the result is not as specified, check the power supply. If the power supply is normal, inspect the transfer indicator switch. Refer to REMOVAL .

  5. CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - TRANSFER INDICATOR SWITCH) 
    1. Check the transfer indicator switch (4WD position).
      Fig 3: Identifying Four Wheel Drive Control ECU Connector & Transfer Indicator Switch Connector
      GTY216849Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Four Wheel Drive Control ECU)      		 *b Front view of wire harness connector
      (to Transfer Indicator Switch)
      1. Disconnect the F47 ECU connector.
      2. Disconnect the B44 switch connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard resistance

        Tester Connection Condition Specified Condition
        F47-3 (4WD) - B44-1 Always Below 1 Ω
        F47-3 (4WD) - Body ground Always 100 kΩ or higher

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

    2. Check the transfer indicator switch (L4 position).
      Fig 4: Identifying Transfer Indicator Switch
      GTY216851Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Four Wheel Drive Control ECU)      		 *b Front view of wire harness connector
      (to Transfer Indicator Switch)
      1. Disconnect the F47 ECU connector.
      2. Disconnect the B45 switch connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard resistance

        Tester Connection Condition Specified Condition
        F47-2 (4WDL) - B45-1 Always Below 1 Ω
        F47-2 (4WDL) - Body ground Always 100 kΩ or higher

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

    3. Check the transfer indicator switch (neutral position).
      Fig 5: Identifying Four Wheel Drive Control ECU Harness Connector & Transfer Indicator Switch Harness Connector
      GTY222374Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Four Wheel Drive Control ECU)      		 *b Front view of wire harness connector
      (to Transfer Indicator Switch)
      1. Disconnect the F47 ECU connector.
      2. Disconnect the B46 switch connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard resistance

        Tester Connection Condition Specified Condition
        F47-16 (NP) - B45-1 Always Below 1 Ω
        F47-16 (NP) - Body ground Always 100 kΩ or higher

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

  6. INSPECT A.D.D. ACTUATOR 
    1. Check the harness and connector (ECU - A.D.D. actuator).
      1. Disconnect the F46 and F47 ECU connectors.
      2. Disconnect the D1 actuator connector.
      3. Measure the resistance according to the value(s) in the table below.
        Fig 6: Identifying Four Wheel Drive Control ECU Wire Harness Connector & A.D.D Actuator Wire Harness Connector
        GTY213179Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Front view of wire harness connector
        (to Four Wheel Drive Control ECU)        		 *b Front view of wire harness connector
        (to A.D.D. Actuator)

        Standard resistance

        Tester Connection Condition Specified Condition
        F47-9 (DL1) - D1-6 (DL1) Always Below 1 Ω
        F47-9 (DL1) - Body ground Always 100 kΩ or higher
        F47-10 (DL2) - D1-5 (DL2) Always Below 1 Ω
        F47-10 (DL2) - Body ground Always 100 kΩ or higher
        F47-15 (ADD) - D1-3 (ADD) Always Below 1 Ω
        F47-15 (ADD) - Body ground Always 100 kΩ or higher
        F46-1 (DM1) - D1-1 (DM1) Always Below 1 Ω
        F46-1 (DM1) - Body ground Always 100 kΩ or higher
        F46-5 (DM2) - D1-2 (DM2) Always Below 1 Ω
        F46-5 (DM2) - Body ground Always 100 kΩ or higher
        D1-4 (GND) - Body ground Always Below 1 Ω

        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.

    2. Check the four wheel drive control ECU (A.D.D. actuator).
      1. Connect the F46 and F47 ECU connectors.
      2. Connect the D1 actuator connector.
      3. Measure the voltage according to the value(s) in the table below.
        Fig 7: Identifying Four Wheel Drive Control ECU Connectors
        GTY221202Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component with harness connected
        (Four Wheel Drive Control ECU)

        Standard voltage

        Tester Connection Switch Condition Specified Condition
        F46-1 (DM1) - F46-4 (GND) Ignition switch ON
        Transfer shift lever position H2 → H4, L4 or N (During operation of A.D.D. actuator motor from FREE to LOCK)        		 10 to 14 V
        Ignition switch ON
        Transfer shift lever position H2 → H4, L4 or N (A.D.D. actuator motor stopped)        		 Below 1.5 V
        F46-5 (DM2) - F46-4 (GND) Ignition switch ON
        Transfer shift lever position H4, L4 or N → H2 (During operation of A.D.D. actuator motor from LOCK to FREE)        		 10 to 14 V
        Ignition switch ON
        Transfer shift lever position H4, L4 or N → H2 (A.D.D. actuator motor stopped)        		 Below 1.5 V
        F47-9 (DL1) - F46-4 (GND) Ignition switch ON
        Transfer shift lever position H2        		 Below 1.5 V
        Ignition switch ON
        Transfer shift lever position H4, L4 or N        		 10.5 to 14 V
        F47-10 (DL2) - F46-4 (GND) Ignition switch ON
        Transfer shift lever position H2        		 10.5 to 14 V
        Ignition switch ON
        Transfer shift lever position H4, L4 or N        		 Below 1.5 V
        F47-15 (ADD) - F46-4 (GND) Ignition switch ON
        Transfer shift lever position H2        		 9.5 to 14 V
        Ignition switch ON
        Transfer shift lever position H4, L4 or N        		 Below 1.5 V

        If the result is not as specified, 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 four wheel drive control ECU.
      1. Connect the F46 and F47 ECU connectors.
      2. Disconnect the D1 actuator connector.
      3. Measure the voltage according to the value(s) in the table below.
        Fig 8: Identifying Four Wheel Drive Control ECU Connectors
        GTY211919Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Front view of wire harness connector
        (to A.D.D. Actuator)

        Standard voltage

        Tester Connection Switch Condition Specified Condition
        D1-3 (ADD) - D1-4 (GND) Ignition switch ON 9.5 to 14 V
        D1-5 (DL2) - D1-4 (GND) Ignition switch ON 10.5 to 14 V
        D1-6 (DL1) - D1-4 (GND) Ignition switch ON 10.5 to 14 V

        If the result is not as specified, replace the four wheel drive control ECU. Refer to REMOVAL . If the voltage is normal, inspect the A.D.D. actuator, because the voltage applied to the motor cannot be measured.

    4. Inspect the A.D.D. actuator. Refer to INSPECTION .
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