ABS speed sensor
#1
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ABS speed sensor
Was wondering if anyone knows what the ABS sensor on top of the rear diff picks up on? What does it use to track the speeds gears and such are moving? If one puts in aftermarket gears, does the sensor loose its ability to know what is going on back there?
I guess I am wondering whether there is something in the factory gear that the sensor reads.
Thanks
I guess I am wondering whether there is something in the factory gear that the sensor reads.
Thanks
#2
Contributing Member
Originally Posted by Elvota
Was wondering if anyone knows what the ABS sensor on top of the rear diff picks up on? What does it use to track the speeds gears and such are moving? If one puts in aftermarket gears, does the sensor loose its ability to know what is going on back there?
I guess I am wondering whether there is something in the factory gear that the sensor reads.
Thanks
I guess I am wondering whether there is something in the factory gear that the sensor reads.
Thanks
ABS sensors read a magnetic ring which can be located almost anywhere on the drivetrain (most often located at each wheel).
Can't say much more without knowing what vehicle.
#3
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Seems to read the teeth on the ring gear. If you remove it and look inside, you see the teeth. Changing the number of teeth shouldn't matter, but some have reported a problem with it reading after a gear change. Tolerance might be the issue = distance from the ring gear. Normally they have to be very very close.
#4
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2nd gens with rear anti-lock have 1 sensor on the rear diff. Looking at the manual it doesn't show anything on the differential. Looks like the sensor just determines if the ring gear is rotating or stopped.
#5
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I thought the ring gears of ABS equiped trucks (of that age) had an ABS ring affixed next to the ring gear. looks like a saw blade with sq teeth. the sensor reads these sq teeth as opposed to the actuall teeth of the ring gear.
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Originally Posted by snap-on
I thought the ring gears of ABS equiped trucks (of that age) had an ABS ring affixed next to the ring gear. looks like a saw blade with sq teeth. the sensor reads these sq teeth as opposed to the actuall teeth of the ring gear.
Aha! In the FSM for rear wheel abs it says "inspect the ring gear (sensor rotor) for scratches, cracks, warping or missing teeth. If necessary, replace the ring gear." And shows the sensor at the teeth edges.
And in the function test for the sensor, all it's looking for is a signal. It's a signal/no signal function test. So it doesn't care what ring gear is in there, as long as the mag pickup can read off the serrations.
Last edited by Flamedx4; 10-17-2005 at 01:03 PM.
#7
Seems to read the teeth on the ring gear. If you remove it and look inside, you see the teeth. Changing the number of teeth shouldn't matter, but some have reported a problem with it reading after a gear change. Tolerance might be the issue = distance from the ring gear. Normally they have to be very very close.
Last edited by kurtdaniel; 08-09-2010 at 04:06 PM.
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