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Home >> Toyota >> 2014 >> Sienna LE, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transfer Case >> Active Torque Control 4WD System (Diagnostics - Introduction) >> Active Torque Control 4WD System >> System Description [08/2013 - ] >> System Description [08/2013 - ]
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System Description [08/2013 - ]

  1. FUNCTION OF MAIN COMPONENTS 
    Component Function
    Combination Meter Assembly AWD Warning Light
    • Illuminates to warn the driver of a malfunction in the active torque control 4WD system.
    • Blinks to inform the driver of the DTCs in diagnostic mode.
    Speed Sensors (4) Detects the wheel speed of each wheel.
    Crankshaft Position Sensor Detects the engine speed and outputs it to the ECM.
    Throttle Position Sensor Detects the throttle valve position and outputs it to the ECM.
    Park/Neutral Position Switch Assembly Detects the shift position of the transaxle and outputs it to the ECM.
    Stop Light Switch Assembly Detects when the brake pedal is depressed.
    Parking Brake Switch Assembly Detects when the parking brake is applied.
    Steering Angle Sensor Detects turning of steering wheel
    Yaw Rate and Acceleration sensor Detects the vehicle's yaw rate and vehicle's longitudinal acceleration and deceleration.
    Transfer Drive force input into the differential is redirected 90 degrees and output to the propeller shaft by the transfer.
    Rear Differential Electromagnetic Control Coupling
    - Electromagnetic Solenoid    		 Distributes drive torque in accordance with the amperage applied by the 4WD control ECU.
    4WD Control ECU
    • Controls the amperage applied to the electromagnetic solenoid based on signals provided by the sensors in order to optimally distribute drive torque in accordance with driving conditions.
    • Turns AWD mode off when a parking brake ON signal is received from the main body ECU (instrument panel junction block).
    • Turns AWD mode off when a shift position signal (P or N) is received from the ECM.
    ECM Outputs signals such as the shift position signal, throttle position signal, and crankshaft position signal to the 4WD control ECU.
    Skid Control ECU Outputs signals such as the vehicle speed signal and deceleration signal to the 4WD control ECU.
    Main Body ECU Outputs signals such as the parking brake signal to the 4WD control ECU.
    Ambient Temperature Detects external ambient temperature and inputs it into body ECU
    Electromagnetic Control Coupling Based on amount of current sent from 4WD control ECU, torque is distributed to rear wheels
  2. DRIVING FUNCTION 
    Vehicle Condition Status
    Control at Vehicle Startup This controls the amount of sideways sliding that occurs at rear of vehicle when accelerating from stop to improve acceleration and hill climbing capacity
    Slip Control at Vehicle Startup This helps prevent vehicle from sliding sideways. When accelerating a stopped vehicle with the steering wheel turned, it ensures steering stability
    Slip Control This ensures high turning performance and that stability is not affected by road surface conditions during mid and high speed running
    Control During Acceleration This controls straight-line running when accelerating during mid and high speeds to ensure straight-line stability of the vehicle
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