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On the 97, its a gear driven sensor in the transfer case.. Chances are that someone put the wrong one in..
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speedo problem?
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patrick112390
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yes i know lol im the one that replaced it! i have the gear that will correct for the 33s coming soon...i do all my own work
fsumotorhead
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The explorer gets its speed signal trom the vss at the transfer case, the pcm and speedo should match. There are usually gain adjustments on any electric gauge, I’m coming from the industrial side of thing vs automotive, but nontheless there is some type of adjustment (might not be “serviceable”).
It may be factory set and not be adjustable, or maybe there is a procedure from ford to set it, either with a scan tool or manually.
More about gain can be found here:
http://en.wikipedia.org/wiki/Gain
It may be factory set and not be adjustable, or maybe there is a procedure from ford to set it, either with a scan tool or manually.
More about gain can be found here:
http://en.wikipedia.org/wiki/Gain
wyochimneysweep
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the gear on the output shaft could be slipping. i'm not sure what on a ford retains it but on a chevy its ia little metal clip and if that broke it would do what urs is doing patrick. video is the same thing my chevy would do when the drive gear slipped around the output shaft
Cobraguy
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Please keep in mind the VSS signal on a 97 comes from the transfer case. But when they eliminated that and went to the sensor in the rear axle only, the VSS signal comes from the ABS module. It will use any of the three ABS signals it receives and send it to the rest of the vehicle. As long as you have one good operating ABS sensor, you will have a VSS signal. You adjust for axle ratio and tire size by a programming change in the ABS module.
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