Question about 2002 Ford Explorer
No ,not tunex . Qualified repair shop . Code's stored in 4X4 control module. Need a factory or some other professional scan tool to read code's .
SECTION 308-07A: Transfer Case - General Information 2000 Explorer/Mountaineer Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 06/17/1999 Transfer Case -Automatic Four Wheel Drive (A4WD) The A4WD system is an electronic shift 4x4 system that allows the operator to choose between three different 4x4 modes. The operator can switch between A4WD and 4WD HIGH modes at any speed. To engage or disengage LOW range, the vehicle speed must be less than 5 km/h, the brake depressed, and the transmission must be in NEUTRAL.
The front/rear driveshaft speed sensors (Hall effect) are mounted to the transfer case and detect the speed of the front and rear driveshafts. This input is used by the generic electronic module (GEM) primarily to control A4WD operation.
The throttle position output signal is provided to the GEM from the powertrain control module (PCM). This signal is used by the GEM in controlling the A4WD clutch.
The shift motor sense plate, an integral part of the electric shift motor, informs the GEM to the position of the transfer case.
The digital TR sensors are located on the LH side of the transmission; these sensors inform the GEM when the transmission is in the neutral position.
The electric shift motor is mounted externally 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, 4HIGH) and LOW range positions.
The 4x4 shift motor uses a module containing two relays which, under the control of the GEM, shifts the transfer case shift motor between HIGH range (A4WD, 4HIGH), and 4LOW modes.
The solid state clutch relay is used to activate the A4WD clutch within the transfer case.
Hall effect sensor monitors input and output shaft speed.
In the A4WD (C-Trac) system, the GEM varies the torque sent to the front driveline by controlling the transfer case clutch. At rest and under cruising conditions, the GEM 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 GEM will increase the duty cycle in order to prevent or control slip:
Posted on Aug 26, 2019
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Posted on Jan 02, 2017
do you mean the elect. control module if so it is behind the radio youll will need the radio tools to take the radio out they can be found at most any parts stores.
Posted on Mar 06, 2009
I had same problem on my 2002 explorer. Its either the computer module, or the electric solenoid on the transfer case. In my case it was both. The computer module I had done twice in 14 months.
Posted on Jul 04, 2009
Check the fuse panel first, after that check your fuse relays under the hood, if not then it might be a wiring problem.
Posted on Jul 30, 2009
Check out F150OwnersBlog.com or 4x4Owners Blog. It sounds like the actuator inside the transfer case is stuck.
If this is the Vacuum shift setup, the plunger inside the 4x4 box is sticking. You also could have low vacuum pressure from a bad Vacuum pump on the engine.
The Electric setups worked differently. The voltage running to the underside wires to the shift solenoid had set values to extend and retract the solenoid plunger. Often, a burned out light in the inside Selector switch on the dash would affect the Voltage sent to the solenoid. A silly thing like changing the indicator bulb would restore the proper voltage underneath the truck.
Remember to sequence the trans to neutral before engaging some of the transfer cases.
I hope my solution is helpful.
Posted on Jul 16, 2012
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