Question about 1999 Ford Explorer

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1996 ford explorer overdrive transmission problem

Transmission not shifting proper and speedomiter not working have changed speed sencor in trans and 4x4 switch in dash and instermint cluster any help on problem thanks in advance

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  • wiley55 Jan 12, 2009

    yes comes up speed scencor fault

  • wiley55 Jan 12, 2009

    tested on 2 scanners same on both lighter works fine

  • wiley55 Jan 13, 2009

    do you know were pcm is this the main car computer under the hood in back firewall thanks for the help

  • wiley55 Jan 13, 2009

    and that is what you mean by pcm

  • yadayada
    yadayada May 11, 2010

    yes that is the main computer u are talking about.

  • yadayada
    yadayada May 11, 2010

    that is wiring, PCM is the computer, it operates the transmission.

  • yadayada
    yadayada May 11, 2010

    u need to either fix the woring to the PCM or replace it.

  • yadayada
    yadayada May 11, 2010

    get another scanner and also check the cigar lighter fuse, if it is blown the scanner will not fuction.

  • yadayada
    yadayada May 11, 2010

    have u run a trouble code test on the system? Autozone and others will do it for free.

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Yes PCM (powertrain control module). is the standard name established by the EPA for all engine control computers, on Ford it also controls the trans shifting.

Posted on Jan 13, 2009

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the dash speed readout is allways feed via the transmission speed sensor , it's usually close to the final drive output from transmission , this not working would also effect car if it had a automatic trans in it as it would not know what speed to shift at, a little less obvious in a 5 speed , wheel sensors usually only feedback to ABS brake system as they tell abs what tires are turning

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The speed sensor on your trans sends a signal to the electronics telling it when to shift, this will be where you fault is.

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They have nothing in common , but if the speedo is not working the trans will not shift , you need to check the speed sencor located on the trans.

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If my trans was unplugged will the speedometer quit working and trans quit shifting? 04 chevy 5.3 z71 vortech


YEP YOU NEED VSS SENSOR HOOKED UP SO TRANSMISSION CAN SHIFT RIGHT.AND SHIFT TO OVER DRIVE AT SET SPEED. YES YOU NEED TO SEE YOUR SPEED TO KEEP FROM GETTING A SPEED TICKET.DONT UNPLUG IT.

Feb 02, 2011 | 2004 Chevrolet Silverado 1500 Crew Cab

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Why doesnt my transmission make shifts speedomiter


First check the 10 amp fuse #1.

If fuse is good, speed sensor has failed or is disconnected. Check connection. If connection is good, replace sensor.

Sensor is mounted on transaxle output. It should have a 3-wire connector on it with one yellow, one orange, and one black wire, as shown in diagram below.

Please let me know if you have questions.

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2 Answers

4wd does not work


Electronic Shift On the Fly (ESOF) Operation
The ESOF system is an electronic shift 4x4 system that allows the operator to choose between two different 4x4 modes as well as 2-wheel drive. The operator can switch between 2WD and 4WD HIGH mode at speed. To engage or disengage LOW Range, the vehicle speed must be less than 5 kph, the brake depressed, and the transmission must be in NEUTRAL.

The transfer case is equipped with an electromagnetic clutch which is located inside the case. This clutch is used to spin up the front drive-line when shifting from 2WD to 4x4 High mode at speed. When the control switch on the instrument panel is turned, the generic electronic module (GEM) recognizes that a shift has been requested and activates the electromagnetic clutch and the relays which power the transfer case shift motor. When the shift motor reaches the desired position as determined by the contact plate position inputs to the GEM, power to the shift relays and motors will be removed. When the transfer case front and rear output shafts are synchronized, the spring loaded lockup collar mechanically engages the main-shaft hub to the drive sprocket. Finally, the front axle collar is engaged and the electromagnetic clutch is deactivated.

Shift Between 2WD and 4x4 HIGH:
Shifts between 2WD and 4x4 HIGH can be made at speed. Listed below are the inputs and outputs needed by the GEM to execute a change between any of these modes.

Feature Inputs:
*4WD Mode Switch (Various resistances).
*Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open).

Feature Outputs:
*4x4 Shift Motor Relay Outputs
*Transfer Case Clutch Relay (grounded when relay is on, open circuit when relay is off).
*4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
*Cluster Indicators (ground when activated, open circuit when deactivated).

Shifting Into/Out of 4WD LOW:
When shifting into or out of 4WD LOW, the GEM requires that the vehicle speed be less than 5 kph, the brake is applied, and the transmission is in NEUTRAL.

Feature Inputs:
*4WD Mode Switch (Various resistances).
*Contact Plate Position Inputs A, B, C, D (grounded when closed, open circuit when open).
*VSS Sensor (Sinusoid Signal: 0.7V-20V, 2.2 Hz/mph).
Brake Input (battery voltage when brake is depress, open circuit when not activated).
*Transmission Range Sensor (grounded when transmission is in NEUTRAL, open circuit otherwise).
8Start/Clutch Depressed Input

Feature Outputs:
*4x4 Shift Motor Relay Outputs
*4x2/4x4 Vacuum Solenoid (grounded when activated, open circuit when deactivated).
*Cluster Indicators (grounded when activated, open circuit when deactivated).

4WD Mode Switch
A rotary switch allows the vehicle operator to choose between 2WD, 4WD HIGH, and 4WD LOW modes of 4x4 operation.

GEM Module
The Generic Electronic Module (GEM) controls the operation of the 4x4 system

Vehicle Speed Sensor
The vehicle speed sensor (VSS), mounted in the rear of the transfer case, informs the GEM of the vehicle speed.

Transfer Case Shift Motor Sense Plates

The shift motor sense plate, an integral part of the electric shift motor, informs the GEM to the positions of the transfer case

Transmission Range Sensor
Located on the left side of the transmission, this sensor informs the GEM when the transmission is in the NEUTRAL position.

Electric Shift Motor
The electric shift motor, mounted externally at the rear of the transfer case, drives a rotary cam which moves the mode fork and range fork within the transfer case to select between the 2WD, 4WD HIGH, and 4WD LOW positions.

4x4/4x2 Vacuum Solenoids
These two solenoids are attached to the upper RH side of the engine compartment dash, and alternately route vacuum to the vacuum motor which engages/disengages the center axle disconnect collar in the front axle assembly.

4x4 Shift Motor Relay
A module containing two relays which under the control of the GEM, shift the transfer case shift motor between the 2WD, 4WD HIGH, and 4WD LOW modes.

Transfer Case Clutch Relay
An electromechanical relay is used to activate the transfer case clutch within the transfer case.

Good luck and hope this helps,but start with the simple and check the fuses and wire harness. Both white/light blue stripe wires should have 12V in run. The GEM will ground the left side (closest to engine) solenoid to disengage the front axle. It will ground the the right side solenoid (closest to fender) to engage the front axle. If the GEM doesn't see Neutral it will not let the truck come out of 4Lo. If the GEM had water leaking on it it may well be the root of the problem. The shift motor only has power when the GEM sends it a signal to move the shift lever. Once the shift is completed the motor shuts off. There are 2 wires that control the shift motor. A yellow and an orange. The GEM alternates between 12v and Ground to these wires to control which way the motor turns. The GEM uses the transfer case shift relay module to control the power to the motor. There are contact plates inside the shift motor assembly that indicate the position that the shift lever is in. This is what the GEM used to know what the T-case is doing. Any one of these components can fail.







Jan 10, 2010 | 2002 Ford Explorer

2 Answers

Could a broken speedometer cause the transmission to not shift properly?


Yes if the vehicle speed sensor is bad than the computer can what speed you are going .SO the shifting comes from the throttle position sensor instead and trans shifting will be erratic :)

Aug 04, 2009 | 1998 Ford Ranger SuperCab

1 Answer

Speed sensor on 2000 ford f150 4x4 triton 4.6


if this helps, please rate as fixya. thanks.

Vehicle Speed Sensor The vehicle speed sensor (VSS) (Figure 43) is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.


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For the 4R70W trans vehicles

Vehicle Speed Sensor (VSS)

The vehicle speed sensor (VSS) is model dependent. Possible sources of vehicle speed input are, anti-lock brake sensor (ABS), a gear-driven vehicle speed sensor (VSS), or the transmission output shaft speed (OSS) sensor. On 4x4 applications with a manual shift transfer case, the transfer case speed sensor is the source of vehicle speed. The VSS signal is either an AC signal whose frequency changes with vehicle speed, or an SCP data message depending on the source. Some vehicles have both. The vehicle speed signal is an input to various vehicle sub-systems such as the powertrain control module (PCM), instrument cluster (speedometer and odometer), speed control systems, etc. The vehicle speed source must be operational to enter output state control mode for diagnostics.

If you have a 4R100 trans, it is different.

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1 Answer

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Hello, The proper name for this A/T control module. Be careful because there are many other factors that control the transmission shifting like shift solenoid, throttle valve solenoid, trans speed sensor, trans temp switch etc. etc.
I hope this helps.
CYA, Gator241

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============
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