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Last changed: 2024/01/01 00:00 / History | Edit |
Navigator Generation I 1998-2002 (Edit)Two wheel drive standard, optional Ford's Control Trac selectable all wheel drive (2H - Auto4wd - 4H - 4L). In Auto4wd mode the behaviour is similar to the automatic all wheel drive - the vehicle is normally rear-wheel drive. Torque is transferred to the front axle via an electro-magnetic clutch when slipping occurs. In 4H mode the clutch is fully locked and the front and rear driveshafts turn at the same speed. The same system is used on Ford Expedition. Optional locking rear differential. Do you think this information about Lincoln Navigator Generation I 1998-2002 is incorrect? Please send us what you know to or leave a comment below. Navigator Generation II 2003-2006 (Edit)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. The operator can switch between A4WD and 4WD HIGH modes at any speed. 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. Wheel slip is sensed using one axle shaft speed sensor on each axle. 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. 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. The brake subsystem sends the following information signals to the 4WD system: occurrences of brake events and failures steering wheel angle status average rear wheel speed average front wheel speed delta front wheel speeds A concern with any of the above listed brake system signals will affect operation of the 4WD system. The throttle position output signal is provided to the 4WD control module from the powertrain control module (PCM). This signal is used by the 4WD control module in controlling the 4WD clutch. The shift motor sense plate, an integral part of the gearmotor encoder assembly, informs the 4WD control module of the transfer case position. The digital transmission range (TR) sensor is located on the LH side of the transmission. This sensor informs the 4WD control module when the transmission is in NEUTRAL. The electric shift motor is mounted externally to the gearmotor encoder assembly at the rear of the transfer case. 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 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. The solid-state clutch is duty-cycled by the 4WD control module to activate the 4WD clutch within the transfer case. In the A4WD system, the 4WD control module varies the torque sent to the front driveline by controlling the transfer case clutch. 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. Under any of the following conditions, the 4WD control module will increase the duty cycle in order to prevent or control slip: slip is detected heavy acceleration (throttle position) Feature inputs: brake ON/OFF switch mode select switch (MSS) digital TR sensor (automatic transmission only) vehicle speed signal (transmitted from the ABS module) front and rear driveshaft speed sensors throttle position information (transmitted from the PCM) gearmotor encoder contact plate position inputs A, B, C, D Feature outputs: solid state clutch (pulse width modulated signal) 4WD LOW indicator 4WD shift motor outputs Shifts between A4WD and 4WD HIGH can be made at any speed. Below are the inputs and outputs needed by the 4WD control module to execute a change between any of these modes. Feature inputs: front and rear driveshaft speed sensors vehicle speed signal throttle position information 4WD Mode Select Switch (MSS) Feature outputs: 4WD shift motor outputs solid state clutch (pulse width modulated signal) 4WD HIGH switch indicator 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. Feature inputs: throttle position information (transmitted from PCM) MSS gearmotor encoder contact plate position inputs A, B, C, D vehicle speed signal (transmitted from ABS module) brake ON/OFF (BOO) switch input (battery voltage when brake pedal is depressed, open circuit when not activated) digital TR sensor (ground when transmission is in NEUTRAL, open circuit otherwise) Feature outputs: 4WD shift motor outputs 4WD LOW switch indicator solid state clutch (pulse width modulated signal) Have you seen a better description of Lincoln Navigator Generation Ii 2003-2006 in a paper magazine? Can you please scan it or take a photo and send it to ? Navigator Generation III 2007-... (Edit)selectable all wheel drive (2H - Auto4wd - 4H), no low range. 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. "The Borg-Warner 1-speed torque-on-demand transfer case is a 2-piece magnesium design. The transfer case transfers engine power from the transmission to the front and rear axles. Under normal driving conditions, the unit is in All-Wheel Drive (AWD), but when desired, the operator may shift into 4x4 high (4H). The operator can switch between 2-Wheel Drive (2WD), AWD and Four-Wheel Drive (4WD) HIGH mode at any speed. The transfer case is equipped with an internal electromagnetic clutch and is shifted electronically. In AWD, the 4X4 control module varies the torque split between front and rear drivelines by controlling the transfer case clutch. Under most conditions, the 4X4 control module activates the transfer case clutch at a minimum duty cycle (percentage of time the clutch is turned on) which allows for a slight speed difference between the front and rear drivelines which normally occurs when negotiating a corner on dry pavement. When the rear wheels are overpowered, the 4X4 control module detects this slip condition and the duty cycle to the transfer case clutch is increased until the speed difference between front and rear drivelines is reduced. In this manner, the 4X4 control module can redirect engine torque to the front wheels when the rear wheels lose traction, yet still allow operation in the AWD mode on dry pavement. The unit is lubricated by a positive displacement fluid pump that channels fluid flow through holes in the rear output shaft." Source: https://www.justanswer.com/questions/22909-2008-lincoln-navigator-4x4 Do you own Lincoln Navigator Generation Iii 2007-...? Can you please make a photo of the car's 4x4 transmission, switches, dashboard lights, etc. and send it to ?
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Last changed: 2024/01/01 00:00 / History | Edit |
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how can I get 2008 lincoln navigator to go into 4x4 low range? 4wd selection is only "auto" or "4x4" with no selection for low. Do I have to sell this and buy and expedition that has 4x4 low range selection?
It appears that 2008 Navigator does not have low range.
The 2007+ Navigator 4WD does not have a 4lo range. Just 2d, AWD, and 4Hi. I guess they never meant it to go seriously off road which makes sense. On the plus side looking on internet it sounds like it is a relatively rugged/trouble free unit and so when you buy one used its comfortable knowing the transffer case cant be blown out by some idiot previous owner wbleepedput it in 4Lo and drove it on paved streets for a few months! Wikipedia has good article on this transfer case en.wikipedia.org