Question about 2002 Ford Explorer

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2002 Ford Explorer XLT does not engage in 4 wheel drive. Disconnected negative terminal to battery, removed 4X4 Control Module, inspected module, modulel looks new, reconnected 4X4CM and reconnected negative cleaned battery terminal. 4 wheel drive still will not engage in nuteral or drive. Should we take it to Tunex?

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  • Ford Master
  • 1,722 Answers

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.
System Function
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:

  • Slip is detected (by using the Hall Effect Sensors)
  • Heavy acceleration (throttle position).
Feature inputs:
  • Brake ON/OFF switch.
  • 4WD mode switch.
  • Digital transmission range sensor.
  • Clutch switch (manual transmission vehicles only).
  • Vehicle speed signal (transmitted from the ABS module).
  • Front/rear driveshaft speed sensors.
  • Throttle position information from the PCM.
  • Contact plate position inputs A, B, C, D.
Feature outputs:
  • Solid state clutch relay (pulse width modulated signal: grounded when relay is on, battery potential when relay is off).
  • A4WD indicator (ground when activated, open circuit when deactivated).
  • 4x4 shift motor relay outputs.
Shifts between A4WD and 4x4 HIGH can be made at any speed. Listed below are the inputs and outputs needed by the GEM to execute a change between any of these modes.
Feature inputs:
  • Front/rear driveshaft speed sensor.
  • Vehicle speed signal.
  • Throttle position information.
  • 4WD mode switch.
Feature outputs:
  • Solid state clutch relay (pulse width modulated signal; grounded when relay is on, battery potential when relay is off).
  • 4x4 HIGH cluster indicator (ground when activated, open circuit when deactivated).
When shifting into or out of LOW range, the GEM 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.
  • 4WD mode switch.
  • Contact plate position inputs A, B, C, D.
  • Vehicle speed signal (transmitted from ABS module).
  • Brake ON/OFF switch input (battery voltage when brake is depressed, open circuit when not activated).
  • Digital transmission range sensor (ground when transmission is in NEUTRAL, open circuit otherwise).
  • Start/clutch depressed input (manual transmission only).
Feature outputs:
  • 4x4 shift motor relay outputs.
  • 4LOW cluster indicators (ground when activated, open circuit when deactivated).
  • Solid state clutch relay (pulse width modulated signal; grounded when relay is on, battery potential when relay is off).

Posted on Aug 26, 2019

  • Jeff Armer
    Jeff Armer Aug 26, 2019

    Tunex won't have a clue .

    P1804 4WD High Indicator Circuit Failure GEM GO to Pinpoint Test C .
    P1806 4WD High Indicator Short to Battery GEM GO to Pinpoint Test C .
    P1808 4WD Low Indicator Circuit Failure GEM GO to Pinpoint Test C .
    P1810 4WD Low Indicator Short Circuit to Battery GEM GO to Pinpoint Test C .
    P1812 4WD Mode Select Circuit Failure GEM GO to Symptom Chart.
    P1815 4WD Mode Select Short Circuit to Ground GEM GO to Symptom Chart.
    P1820 Transfer Case CW Shift Relay Coil Circuit Open or Short to Ground GEM GO to Pinpoint Test B .
    P1822 Transfer Case CW Shift Relay Coil Short to Battery GEM GO to Pinpoint Test B .
    P1824 4WD Electric Clutch Relay Circuit Failure GEM GO to Pinpoint Test A .
    P1826 4WD Electric Clutch Relay Short to Battery GEM GO to Pinpoint Test A .
    P1828 Transfer Case CCW Shift Relay Circuit Failure GEM GO to Pinpoint Test B .
    P1830 Transfer Case CCW Shift Relay Coil Short to Battery GEM GO to Pinpoint Test B .
    P1836 Transfer Case Front Shaft Speed Sensor Circuit Failure GEM GO to Symptom Chart.
    P1837 Transfer Case Rear Shaft Speed Sensor Circuit Failure GEM GO to Symptom Chart.
    P1838 Transfer Case Shift Motor Circuit Failure GEM GO to Pinpoint Test B .
    P1846 Transfer Case CONTACT PLATE "A" Circuit Failure GEM GO to Pinpoint Test B .
    P1850 Transfer Case CONTACT PLATE "B" Circuit Failure GEM GO to Pinpoint Test B .
    P1854 Transfer Case CONTACT PLATE "C" Circuit Failure (GEM Only) GEM GO to Pinpoint Test B .
    P1858 Transfer Case CONTACT PLATE "D" Circuit Failure (GEM Only) GEM GO to Pinpoint Test B .
    P1866 Transfer Case Maintenance Required (GEM Only) (4-wheel drive operation can be restored by clearing the DTC and cycling the ignition.) GEM GO to Pinpoint Test B .
    P1867 Transfer Case Contact Plate General Circuit Failure (GEM Only) GEM GO to Pinpoint Test B .
    P1874 Automatic Hall Effect Sensor Power Circuit Failure GEM GO to Symptom Chart.
    P1875 Automatic Hall Effect Sensor Power Circuit Short to Battery (GEM Only) GEM GO to Symptom Chart.
    P1891 Transfer Case Contact Plate Ground Return Open Circuit GEM GO to Pinpoint Test B .

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Posted on Jan 02, 2017

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Anonymous

  • 29 Answers

SOURCE: How do you install a 4x4 control module for a 2004 Ford Explorer.

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

MNfisherman

Nate Stansfield

  • 11896 Answers

SOURCE: cannot connect the negative battery terminal without spark or starter turning over

You will need new igniton cylinder. Sounds like you have a short in the cylinder.

Posted on May 23, 2009

Anonymous

  • 30 Answers

SOURCE: 02 Ford Explorer XLT 4x4 High light flashes and

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

Anonymous

  • 11 Answers

SOURCE: 2002 Ford Explorer passenger power window problem

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

fordexpert

  • 5692 Answers

SOURCE: i have a 93 ford 250 7.3 deisel standard with a manual 4x4 and it wants to keep jumping from 2 wheel drive to 4 wheel drive and the 4x4 shifter doesn't want to push down into nuteral

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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How to access 2002 ford explorer control module


To locate the BCM remove the passenger side instrument panel insulator.Disconnect the negative battery cable. You should be able to see the BCM tucked up behind the dash panel. Will have three wire pack connectors. You have to reprogram the new one when installed. You can not get another, from a salvage yard and make it work. Either go to dealer, or someone who can reprogram it for you. God-Bless!!

Dec 15, 2014 | 2002 Ford Explorer

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I have a 1998 explorer and the 4wheel drive will switch on like it should and the lights do not blink or anything but I can tell the rear end doea lock in low but never any power to front axle in any...


On these issue,there are few solved help links for troubleshooting the issue easily.-------

Click the link below:---
No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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4X4 Truck makes roaring noise in the front end?

http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html

-------------
Car will not go into 4WD high or 4WD low?


http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html

--------------
No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

------------
4 wheel drive system will not disengage?

http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html

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4WD light is flashing and beeping? NO 4WD high?

http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html

----------
2002 Jeep Wrangler: 4WD Idiot Light is ON?

http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html

----------

Traction control switch will not engage on 4WD High or Low

http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html

-----------

4WD light flashing and 4WD will engage after few minutes

http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html

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2008 Toyota Tundra: 4x4 Wheel Drive Light is Flashing?

http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html

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4x4 front differential will not engage the axle on ford?

http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html

-------
4x4 will not engage on Ford F150? http://technoanswers.blogspot.in/2012/02/4x4-will-not-engage-on-ford-f150.html

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Dodge Ram 4x4 light keeps flashing 4X4 LOW LIGHT IS FLASHING ON DASH

http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html

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http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html

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These details will help.

Thanks.

Nov 23, 2012 | Cars & Trucks

1 Answer

I have a 93 ford explorer 4x4 where is 4x4 module located and its an automatic 4 door


The transfer case control module is behind the plastic panel above the left rear wheel well

Mar 30, 2010 | 1993 Ford Explorer Limited

1 Answer

02 Ford Explorer XLT 4x4 High light flashes and


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.

Mar 19, 2009 | 2002 Ford Explorer

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2006 Ford Explorer XLT the Blower Fan only works on 4 and 3 Sp


Look under the dash on passenger side and just to the left of the blower motor housing you will see the 4WD control module.Remove the 2 screws holding the module and let it hang down and your resistors are behind this.Remove the 2 screws holding the resistors and remove.
Now I am assuming you have manual climate control and not electonic.

Feb 25, 2009 | 2006 Ford Explorer

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The 4X4 on my 2002 Ford Explorer doesnt work.


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1 Answer

Ford 2005 4x4 problem.


2-Speed Torque-On-Demand (TOD) Operation
The automatic 4-wheel drive (A4WD) system is a 2-speed torque-on-demand (TOD) operation that utilizes the following components:
  • Transfer case
  • 4-wheel drive (4WD) control module (integral to the powertrain control module [PCM])
  • Mode select switch (MSS)
  • Gearmotor encoder assembly (part of the transfer case shift motor)
  • Transfer case shift motor
  • Shift motor sense plate (part of the gearmotor encoder assembly)
Principles of Operation
Transfer Case Shift Motor The externally mounted transfer case shift motor, located at the rear of the transfer case, turns the shift cam assembly. As the shift cam assembly turns, it positions the reduction shift fork for desired transfer case operation. An integral position sensor in the shift motor provides shift motor position information to the 4WD control module.
Mode Select Switch (MSS) The push button MSS, mounted on the instrument panel, allows the operator to select the 4x4 Auto, 4x4 High, and 4x4 Low transfer case operating modes. The indicator light, on the instrument cluster push button, will illuminate only when the 4x4 Low position is engaged.
Visual Inspection Chart Mechanical Electrical
  • Axle shafts and CV joints
  • Driveshaft and universal joints
  • Fluid leaks
  • Matching tire sizes
  • Transfer case shift motor
  • Battery junction box (BJB) fuses:
    • 8 (30A)
    • 17 (5A)
    • 18 (20A)
  • Central junction box (CJB) fuses:
    • 12 (5A)
    • 24 (15A)
  • 4x4 module (PCM)
  • Wiring harness
  • Gearmotor encoder contact plate
  • Connector(s)
  • Circuitry
  • Mode indication switch (MSS)

  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the concern is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  1. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
  1. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
    • CAN circuit fault; all electronic control units no response/not equipped, refer to Section 418-00 .
    • No response/not equipped for 4WD module (PCM), Go To Pinpoint Test G .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the 4WD module (PCM) self test.
  1. If the DTCs retrieved are related to the concern, go to the 4WD Control Module (PCM) Diagnostic Trouble Code (DTC) Index to continue diagnostics. 4WD Control Module (PCM) Diagnostic Trouble Code (DTC) Index
    DTC Description Source Action B1317 Battery Voltage HIGH 4WD Module (PCM) REFER to Section 414-00 . B1318 Battery Voltage LOW 4WD Module (PCM) REFER to Section 414-00 . B1319 Driver Door Ajar Circuit Failure 4WD Module (PCM) Go To Pinpoint Test M . B1322 Driver Door Ajar Circuit Short To Ground 4WD Module (PCM) Go To Pinpoint Test M . B1342 ECU is Defective 4WD Module (PCM) CLEAR the DTCs. REPEAT the 4x4 module (PCM) self test. If DTC B1342 is retrieved, INSTALL a new 4x4 module (PCM). REFER to Section 303-14 . CLEAR the DTCs. REPEAT the self test. B1483 Brake Pedal Input Circuit Failure 4WD Module (PCM) Go To Pinpoint Test M . B1485 Brake Pedal Input Short to Battery 4WD Module (PCM) Go To Pinpoint Test M . C1729 Transfer Case Unable to Transition Between 4H and 4L 4WD Module (PCM) Go To Pinpoint Test K . C1970 4WD Low Mode Switch LED Short to Battery 4WD Module (PCM) Go To Pinpoint Test K . C1971 4WD Low Mode Switch LED Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1707 Transfer Case NEUTRAL or PARK/NEUTRAL Indication Circuit 4WD Module (PCM) Go To Pinpoint Test M . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1816 Transmission NEUTRAL Safety Switch Circuit Failure 4WD Module (PCM) Go To Pinpoint Test M . P1819 Transmission NEUTRAL Safety Switch Circuit Short to Ground 4WD Module (PCM) Go To Pinpoint Test M . P1820 Transfer Case Clockwise Shift Relay Coil Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1822 Transfer Case Clockwise Shift Relay Coil Circuit Short To Battery 4WD Module (PCM) Go To Pinpoint Test K . P1824 4-Wheel Drive Clutch Relay Circuit Failure 4WD Module (PCM) Go To Pinpoint Test H . P1826 4-Wheel Drive Low Clutch Relay Short Circuit to Battery 4WD Module (PCM) Go To Pinpoint Test H . P1827 4-Wheel Drive Low Clutch Relay Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test H . P1828 Transfer Case Counterclockwise Shift Relay Coil Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1830 Transfer Case Counterclockwise Shift Relay Coil Circuit Short To Battery 4WD Module (PCM) Go To Pinpoint Test K . P1849 Transfer Case Contact Plate A Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1853 Transfer Case Contact Plate B Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1857 Transfer Case Contact Plate C Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1861 Transfer Case Contact Plate D Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1867 Transfer Case Contact Plate General Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1891 Transfer Case Contact Plate Ground Return Open Circuit 4WD Module (PCM) Go To Pinpoint Test K . U1900 CAN Communication BUS Fault 4WD Module (PCM) REFER to Section 418-00 . U2023 External Node Fault 4WD Module (PCM) REFER to Section 418-00 . U2051 One Or More Calibration Files Missing/Corrupt 4WD Module (PCM) Reprogram/Reflash the 4x4 module. REFER to Section 418-00 . - For All Other DTCs 4WD Module (PCM) REFER to Section 418-00 .
  2. Your best bet mite be to take it to a qualified repair shop !

May 30, 2017 | 2005 Ford Explorer

1 Answer

4x4 will not engage,lights just blink,and you can here clicking


The 4x4 system has a controller,or computer,called the Body Control Module and there will be stored trouble codes.To work on a system that's electronically controlled,you have to get the codes from the system.Every trouble code has a diagnostic route to follow to resolve the faulty component.I have read about Explorers having faulty door open/closed sensors.These set a code in the Body Control Module,and in the process,the BCM inhibits 4x4 operation,causing a no 4 wheel drive complaint.There is also an electric motor on the transfer case that can fail electrically or mechanically,along with speed sensors and fork position sensors that can give trouble.

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