TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM SYSTEM DESCRIPTION


  1. DESCRIPTION


    • A part-time 2-speed VF2CM transfer uses a touch select 2-4 and high-low system, enabling the driver to switch between H2, H4 and L4 modes by turning the transfer position switch.

    • Through these switch signals, the 4 wheel drive control ECU actuates the shift motor in the transfer shift actuator and another shift motor in the A.D.D. actuator (differential motor actuator assembly).

    • When driving in 4WD at high speeds on dry pavement, the front differential oil temperature may rise excessively, resulting in oil leaks or seizures. To avoid such occurrences, the 4 wheel drive control ECU monitors the oil temperature via the front differential oil temperature sensor and provides a front differential temperature warning using a message and the warning buzzer.

  2. DRIVING MODE SWITCHING PATTERN

    B003RR9C01
    *1 Transfer Position Switch - -

  3. INDICATOR LIGHT, WARNING MESSAGE AND WARNING BUZZER OPERATING CONDITIONS

    2WD/4WD Mode Control
    Mode 4WD Indicator Light (Green) 4LO Indicator Light Multi-information Display Message Warning Buzzer
    H2 Not illuminated Not illuminated - Not sounding
    While switching between H2 and H4 Blinking Not illuminated - Not sounding
    H4 Illuminated Not illuminated - Not sounding
    While switching between H4 and L4 Illuminated Blinking - Not sounding
    L4 Illuminated Illuminated - Not sounding
    A.D.D. Actuator malfunction Not illuminated Not illuminated 2WD-4WD mode change malfunction visit your dealer Not sounding
    High-Low malfunction Status displayed*1 Rapidly blinking - Not sounding
    Other switching malfunction*2 Not illuminated Rapidly blinking 2WD-4WD mode change malfunction visit your dealer Not sounding

    • *1: Displays the 2WD/4WD mode status during a malfunction

    • *2: Malfunctions not listed in "Mode" or "Control Mode"


    • Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)

    • Rapidly blinking: Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)

    Front Differential Oil Temperature Warning Control
    Control Mode 2WD/4WD Mode Status 4WD Indicator Light (Green) 4LO Indicator Light Multi-information Display Message Warning Buzzer
    Front differential oil temperature warning starts H4 Illuminated Not illuminated Differential oil temp high Shift to 2WD mode Cooling time required Sounding
    L4 Illuminated Illuminated Differential oil temp high Shift to 2WD mode Cooling time required Sounding
    Vehicle speed limit control starts*1 H4 Illuminated Not illuminated Differential oil temp high Shift to 2WD mode Cooling time required Sounding
    L4 Illuminated Illuminated Differential oil temp high Shift to 2WD mode Cooling time required Sounding
    While switching to H2 H4 Illuminated Not illuminated Differential oil temp high Shift to 2WD mode Cooling time required Sounding
    Switching to H2 complete H2 Not illuminated Not illuminated Differential oil temp high Cooling time required Sounding finished
    Vehicle speed limit control finished H2 Not illuminated Not illuminated - Not sounding
    Front differential oil temperature sensor malfunction - Not illuminated Status displayed*2 2WD-4WD mode change malfunction visit your dealer Not sounding

    • *1: 30 seconds after front differential oil temperature warning starts

      *2: Displays the 2WD/4WD mode status during a malfunction

  4. FUNCTION OF COMPONENTS

    Components Functions
    Transfer position switch Switches between the following 3 drive modes: H2, H4 and L4.
    Combination meter assembly 4WD indicator light (green)

    Illuminates to inform the user of 4WD mode status.

    Blinks to inform the user of mode switching.
    Multi-information display

    Displays a malfunction message to inform the user of a system malfunction.

    Displays a message to inform the user of a front differential oil temperature warning.
    4LO indicator light

    Illuminates to inform the user of L4 mode status.

    Blinks to inform the user of mode switching.

    Rapidly blinks to inform the user of a system malfunction.
    Warning buzzer Sounds to inform the user of a front differential oil temperature warning or switching condition violation.
    Skid control ECU (brake actuator assembly) Outputs wheel speed signals to the 4 wheel drive control ECU via CAN communication.
    ECM Outputs information such as the shift lever position and engine speed to the 4 wheel drive control ECU via CAN communication.
    Clutch start switch assembly (for Manual Transmission) Detects clutch pedal depression and sends that information to the 4 wheel drive control ECU.
    4 wheel drive control ECU Detects the vehicle status from wheel speed signals, vehicle speed signals, etc. received via CAN communication, and switches to the requested 4WD mode (H4 or L4) by operating the transfer shift actuator assembly and A.D.D. actuator (differential motor actuator assembly) according to the operation of the transfer position switch.
    Transfer shift actuator assembly Transfer shift motor and limit switch Operates the shift motor according to commands sent from the 4 wheel drive control ECU and switches to 4WD mode (H4 or L4).
    4WD detection switch Detects the 4WD condition and sends that information to the 4 wheel drive control ECU.
    L4 detection switch Detects the low gear position and sends that information to the 4 wheel drive control ECU.
    A.D.D. actuator (differential motor actuator assembly) A.D.D. shift motor and limit switch Operates the A.D.D. shift motor according to commands sent from the 4 wheel drive control ECU and switches between 2WD and 4WD.
    A.D.D. position switch Detects the 2WD and 4WD A.D.D. positions and sends that information to the 4 wheel drive control ECU.
    Oil temperature sensor Detects the oil temperature in the front differential.

    • Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)

    • Rapidly blinking: Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)