Need Help
#1
11-21-2006
Join Date: Nov 2005
Location: Waycross, Ga
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#3
11-21-2006
The signal for the speedometer on 1998~2000 Rangers is taken from the ABS sensor reading the tone ring in the rear differential. There are two common causes for the symptoms you have on your 99.
One is a failure of the sensor itself and it is easy to change. Look for it on top of the differential case. It can be swapped out from the outside without disturbing anything inside the housing.
The other problem can be the connection from the interior wiring harness to the rear harness. It is a large 40-pin connector under the driver seat and is accessible from under the truck. Unscrew the center bolt, open it up and look for water or corroded terminals inside. Even if there is none, it is good preventative maintenance to pack this vulnerable connector with dielectric grease, available at Ford dealers and auto parts stores.
One is a failure of the sensor itself and it is easy to change. Look for it on top of the differential case. It can be swapped out from the outside without disturbing anything inside the housing.
The other problem can be the connection from the interior wiring harness to the rear harness. It is a large 40-pin connector under the driver seat and is accessible from under the truck. Unscrew the center bolt, open it up and look for water or corroded terminals inside. Even if there is none, it is good preventative maintenance to pack this vulnerable connector with dielectric grease, available at Ford dealers and auto parts stores.
#4
11-21-2006
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Location: Waycross, Ga
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well i just went around the block and now the speedo isnt working at all.....ive checked all the fuses on the dash and im about to go check the underhood ones. does that help out any more? 
and by the way i installed a body lift over the weekend. but today is the first time this showed up. i was very careful not to stretch or pinch anything. but thanks for the info bob! i'll go check them out and make sure they are ok
and by the way i installed a body lift over the weekend. but today is the first time this showed up. i was very careful not to stretch or pinch anything. but thanks for the info bob! i'll go check them out and make sure they are ok
Last edited by rileyw05; 11-21-2006 at 02:12 PM.
#5
11-21-2006
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ok so i pretty much checked everything under the truck. I found that i had a loose ground which was contributing to some of the funny light behavior i experienced. I tightened the ground and disconnected the battery and then re-hooked it. But the ABS light is still on and the speedo still doesnt work. What is the proper way of re-setting the computer?
#6
01-11-2007
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Originally Posted by rileyw05
ok so i pretty much checked everything under the truck. I found that i had a loose ground which was contributing to some of the funny light behavior i experienced. I tightened the ground and disconnected the battery and then re-hooked it. But the ABS light is still on and the speedo still doesnt work. What is the proper way of re-setting the computer?
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