Intermitten speed sensor
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Senior User
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Intermitten speed sensor
96 AWD 4.0. On a recent trip the PCM would lose the vehicle speed input intermittently. This would cause the transmission to drop to first gear at highway speeds. I replaced the speed sensor on the rear pumpkin and it was good for a while, but recurred. Then I taped the plug to the sensor and that helped a little. I added 1/2 quart gear oil to the rear end at that time as I noted it was low. The only way to reset the system was to pull over and turn the vehicle off. It was a crap shoot on when it would recurr. With the new sensor, the speedometer needle would bounce around. When it was steady, the problem would occur.
Elder User
Joined: Dec 2002
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From: Georgia
That sounds like the problem I had. It is in https://www.ford-trucks.com/forums/4...m-i-think.html .
In the end I had to replace the PSOM. Check it out.
In the end I had to replace the PSOM. Check it out.
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Thanks, Tom. I'll check that out. Do you have to replace the entire instrument set or can you just do the PSOM? I guess if you are going to open the dash, just replacing the entire thing would be worth the effort.
Elder User
Joined: Dec 2002
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From: Georgia
The PSOM is attached to the back of the instrument cluster. I don't remember if you can replace just that. I got the whole cluster from the junk yard. It ran for several years without a problem. Then a tree fell on the van.
I doubt you can buy just the PSOM. I never checked. Go ahead and do the whole thing. See if you can get one with less mileage on it. Mine did' I wrote it down incase I sold it later. It ended up in the scrap yard so it didn't matter.
I doubt you can buy just the PSOM. I never checked. Go ahead and do the whole thing. See if you can get one with less mileage on it. Mine did' I wrote it down incase I sold it later. It ended up in the scrap yard so it didn't matter.
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