1998 Ford Explorer Speedometer

Tiny
FORDPGH
  • MEMBER
  • 1998 FORD EXPLORER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 155,000 MILES
I have a 1998 Explorer that the speedometer AND odometer stop working after driving 5 to 8 miles. At first I thought the sub zero weather could have something to do with it however that does not appear to be the case. I reset the trip odometer every time I start the vehicle and depart. The average distance I get before it stops working is 6 miles.
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Monday, February 2nd, 2009 AT 10:48 AM

9 Replies

Tiny
RACEFAN966
  • EXPERT
Ok I would test the VSS (vehicle speed sensor) first and see what it is doing. If you have a digital mulit meter and would like to test it yourself then let me know and we will go from there.
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Monday, February 2nd, 2009 AT 1:16 PM
Tiny
FORDPGH
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Thank you! I do have a multimeter to test it if I can find it.
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Monday, February 2nd, 2009 AT 1:25 PM
Tiny
RACEFAN966
  • EXPERT
Ok first we are going to do a self test which is using the cruise to tell us weather or not there is anything wrong with the speed sensor first ok. Now this sequence will need to be kind of quick but you must pay attention to the cruise light as it will flash and give codes to tell us weather or not to do the test on the VSS ok. You will be pressing the buttons on the steering wheel for the cruise so it will talk to us ok.
1) Put in park and set E-brake, while holding the off button turn the key on engine off. The cruise light should have flashed once to tell us it in self diagnostic mode. If it didn't flash then repeat this step.
2)release the off button within 5 sec of turning on the key and now press the on button. Now press the remaining speed control button's in the following sequence ok - ON, RES, COAST, SET/ACCEL. As each button is pressed the cruise light will flash, wait till the light goes out to press the next button.
3)After completed the cruise light will flash to indicate pass or fail. Count the flashes.
4) Now the actuator will perform a test and lift the throttle 1 to 10 mm after throttle has returned the turn off key.
Get back to me after this with how many flashed you counted and we will go to the next step.
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Monday, February 2nd, 2009 AT 1:40 PM
Tiny
FORDPGH
  • MEMBER
I put the Explorer in park, set the emergency break, pushed and held in the off button and turned the vehicle off -but the cruise light did not flash. I tried it repeatedly (a dozen times) with no luck.

I tried it before I left when the speedometer was working and again when I returned home when it wasn't working.

The vehicle will hold an unknown speed with the cruise control on even when the speedometer is not working.

Does information help in the troubleshooting?
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Tuesday, February 3rd, 2009 AT 2:13 PM
Tiny
RACEFAN966
  • EXPERT
Ok you need to hold the off button then turn the key on with the engine off (meaning don't start it but put the key in the run possition) Then you should see the light flash and then follow the rest of the steps.
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Wednesday, February 4th, 2009 AT 10:12 AM
Tiny
FORDPGH
  • MEMBER
Thanks for the clarification.

I Put in Park and set the E brake. Shut the vehicle off while holding the off button. Turned the key on and the cruise light flashed once. Hit the ON button and it flashed once.

After that, the light would not flash with the continuation of the series.
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Tuesday, February 10th, 2009 AT 9:58 AM
Tiny
RACEFAN966
  • EXPERT
Ok with that it is saying that the cruise control will go into the test and the first test passes but that is it so the VSS needs to be tested now ok. First check fuse number 10 it should be a 7.5 amp fuse make sure it is good. Other wise I need you to unplug the cruise harnes and then the abs harness and do a ohm test between the servo module connector number 3 and the abs module harness connector number 10 let me know what the ohms is and this test is done with key off. Here are the pics of the harnesses so you know what term it what.
Cruise harness


http://www.2carpros.com/forum/automotive_pictures/249564_Graphic_39.jpg



The ABS harness


http://www.2carpros.com/forum/automotive_pictures/249564_Graphic1_1.jpg

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Tuesday, February 10th, 2009 AT 10:16 AM
Tiny
FORDPGH
  • MEMBER
The fuse checked out okay.

Between the cruise harness connector 3 and ABS harness 10 is: 0.3 ohms.
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Wednesday, February 11th, 2009 AT 10:47 AM
Tiny
RACEFAN966
  • EXPERT
Ok with that test it say's the speed servo is bad. However this don't answer why the speedo don't work so lets do another test on the VSS.
Now with key off unplug the speed servo connector and hook you multi meter between term number 3 and ground and set it on ac setting and drive the car after 30 mph it should give you a voltage reading let me know what you find. If you get nothing then the VSS is no good and needs to be replaced.
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Thursday, February 12th, 2009 AT 10:19 AM

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