![]() Under normal driving conditions, the unit is in All-Wheel Drive (AWD), but when desired, the operator may shift into 4x4 high (4H). The transfer case transfers engine power from the transmission to the front and rear axles. "The Borg-Warner 1-speed torque-on-demand transfer case is a 2-piece magnesium design. In the Auto4wd mode the behaviour is similar to the automatic all wheel drive - normally a rear-wheel drive vehicle, torque transfer to the front when needed. Selectable all wheel drive (2H - Auto4wd - 4H), no low range. Vehicle speed signal (transmitted from ABS module)īrake ON/OFF (BOO) switch input (battery voltage when brake pedal is depressed,ĭigital TR sensor (ground when transmission is in NEUTRAL, open circuit otherwise)ĭo you think this information about Lincoln Navigator Generation Ii 2003-2006 is incomplete? Please send us what you know to or leave a comment below. Throttle position information (transmitted from PCM) When shifting into or out of LOW range, the 4WD control module requires that the vehicle speed is less than 5 km/h (3 mph), the brake is applied, and the transmission is in NEUTRAL. Shifts between A4WD and 4WD HIGH can be made at any speed.īelow are the inputs and outputs needed by the 4WD control module to execute a change between any Solid state clutch (pulse width modulated signal) Gearmotor encoder contact plate position inputs A, B, C, D Throttle position information (transmitted from the PCM) Vehicle speed signal (transmitted from the ABS module) Under any of the following conditions, the 4WD control module will increase the duty cycle in order to prevent or control slip:ĭigital TR sensor (automatic transmission only) At rest and under cruising conditions, the 4WD control module activates the transfer case clutch a minimum duty cycle (percentage of time the clutch is turned on), which allows for the slight difference between the front and rear driveshafts which normally occurs when negotiating a corner on dry pavement. In the A4WD system, the 4WD control module varies the torque sent to the front driveline by controlling the transfer case clutch. The solid-state clutch is duty-cycled by the 4WD control module to activate the 4WD clutch within the transfer case. The 4WD shift motor is controlled by the 4WD control module which shifts the transfer case shift motor between HIGH range (A4WD, 4WD HIGH), and 4WD LOW modes. It drives a rotary cam which moves the mode fork and range fork within the transfer case between the HIGH range (A4WD, 4WD HIGH) and 4WD LOW range positions. The electric shift motor is mounted externally to the gearmotor encoder assembly at the rear of the transfer case. This sensor informs the 4WD control module when the transmission is in NEUTRAL. The digital transmission range (TR) sensor is located on the LH side of the transmission. The shift motor sense plate, an integral part of the gearmotor encoder assembly, informs the 4WD control module of the transfer case position. This signal is used by the 4WD control module in controlling the 4WD clutch. The throttle position output signal is provided to the 4WD control module from the powertrain control module (PCM). The brake subsystem sends the following information signals to the 4WD system:Ī concern with any of the above listed brake system signals will affect operation of the 4WD system. The 4WD control module will provide the IVD brake system with current clutch duty cycle and whether or not IVD may command the clutch duty cycle. Based on throttle position and wheel slip, a pulse width modulated (PWM) signal is transmitted to the transfer case clutch when a predetermined slip-threshold is exceeded. Wheel slip is sensed using one axle shaft speed sensor on each axle. To engage or disengage 4WD LOW range, the vehicle speed must be less than 5 km/h (3.1 mph), the brake pedal must be pressed and the transmission must be in NEUTRAL. The operator can switch between A4WD and 4WD HIGH modes at any speed. The automatic four-wheel drive (A4WD) system is an electronic-shift 4WD system that allows the operator to choose between 2WD and three different 4WD modes. ![]()
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