abs speedo problem
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Mountain Pass
Joined: Nov 2004
Posts: 215
Likes: 0
From: nj
abs speedo problem
ok i have a 94 f150 4x4 and the abs and brake lites are on i replaced the speed sensor in the diff and have not found 1 in the trans or transfer case. now this all started before changing the sensor the speedo jumps all over the place also and when the truck drives about 10 to 20 miles when i come to a stop the oil press gage drops and bounces all over the place so im looking for ideas and yes the pressure sensor has been changed
Posting Guru
Joined: Jan 2004
Posts: 2,403
Likes: 4
From: Charlestown, RI
You have a few separate issues going on.
Speedo/ABS: Could be a bad ABS module, which is behind the glove box. Pop the glove box out, the black box that's right behind it is the ABS module. Unplug it, test drive and see what happens. If that's not it, it could be the tone ring in the rear diff, or a bad PSOM (speedometer). Make sure all the wiring from the rear sensor is good as well.
ABS/brake light can also be caused by low fluid level in the master cylinder.
Oil pressure gauge: Could be an indication of internal wear (rod/mains), a bad oil pump or clogged pickup screen. Put a known good mechanical pressure gauge on it to find out for sure if it's low oil pressure.
Speedo/ABS: Could be a bad ABS module, which is behind the glove box. Pop the glove box out, the black box that's right behind it is the ABS module. Unplug it, test drive and see what happens. If that's not it, it could be the tone ring in the rear diff, or a bad PSOM (speedometer). Make sure all the wiring from the rear sensor is good as well.
ABS/brake light can also be caused by low fluid level in the master cylinder.
Oil pressure gauge: Could be an indication of internal wear (rod/mains), a bad oil pump or clogged pickup screen. Put a known good mechanical pressure gauge on it to find out for sure if it's low oil pressure.
Der Postmeister
Joined: Sep 2006
Posts: 6,859
Likes: 560
From: Long Beach, Calimexiforia
You have a few separate issues going on.
Speedo/ABS: Could be a bad ABS module, which is behind the glove box. Pop the glove box out, the black box that's right behind it is the ABS module. Unplug it, test drive and see what happens. If that's not it, it could be the tone ring in the rear diff, or a bad PSOM (speedometer). Make sure all the wiring from the rear sensor is good as well.
ABS/brake light can also be caused by low fluid level in the master cylinder.
Oil pressure gauge: Could be an indication of internal wear (rod/mains), a bad oil pump or clogged pickup screen. Put a known good mechanical pressure gauge on it to find out for sure if it's low oil pressure.
Speedo/ABS: Could be a bad ABS module, which is behind the glove box. Pop the glove box out, the black box that's right behind it is the ABS module. Unplug it, test drive and see what happens. If that's not it, it could be the tone ring in the rear diff, or a bad PSOM (speedometer). Make sure all the wiring from the rear sensor is good as well.
ABS/brake light can also be caused by low fluid level in the master cylinder.
Oil pressure gauge: Could be an indication of internal wear (rod/mains), a bad oil pump or clogged pickup screen. Put a known good mechanical pressure gauge on it to find out for sure if it's low oil pressure.
Der Postmeister
Joined: Sep 2006
Posts: 6,859
Likes: 560
From: Long Beach, Calimexiforia
More likely the sender unit.
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Mountain Pass
Joined: Nov 2004
Posts: 215
Likes: 0
From: nj
i know its got to do with wire og ground because i grounded the wire after the engine was hot and the gauge still played games
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Der Postmeister
Joined: Sep 2006
Posts: 6,859
Likes: 560
From: Long Beach, Calimexiforia
Ya, it should stay pegged over while grounded, unless the wire is compromised somewhere on it's way to the gauge. Can someone watch the gauge while you wiggle the wire while well grounded?
