ABS still acting up... need big time help - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 01-13-2008
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ABS still acting up... need big time help

So took off my lift spindles, put the ABS sensors back in and put the fuse in.
Like was happening when I had the lift, ABS is kicking in when i just slow down to a slow, normal stop on dry ground. I can feel its the front ABS, havent messed with the rear. Also, I got a pair of new (used) sensors for the front I tried and that didnt do anything different. I dont know if all the sensors i have are bad or what... I'm lost

Any help is appreciated.
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Old 01-13-2008
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Mine was doing that with a bad sensor up front, no abs light. I could tell it was the drivers side because when it kicked in the truck slightly puuled to the right. I changed the sensor on the drivers side and it fixed it. I don't know how to test sensors. Just thought I'd share.
John
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Old 01-13-2008
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According to the Ford Manual the sensor resistance readings should be as follows:

Between terminals
.8 - 1.4 kilo-ohms (4x2) front
.38 - .48 kilo-ohms (4x4) front
.8 - 2.5 kilo-ohms rear

Between ground
Should be greater than 10,000 ohms
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Old 01-13-2008
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Quote:
Originally Posted by Rev
According to the Ford Manual the sensor resistance readings should be as follows:

Between terminals
.8 - 1.4 kilo-ohms (4x2) front
.38 - .48 kilo-ohms (4x4) front
.8 - 2.5 kilo-ohms rear

Between ground
Should be greater than 10,000 ohms
Which wouldnt really help me unless i cut the wires and hooked up an ohm meter while i was driving?

Christian is on his way over and we're gonna test his sensors on my truck.
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Old 01-13-2008
04 EDGE
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live data scanner is the only way your going to figure out witch sensor is "dropping out" under 5mph causing a false abs event.
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Old 01-13-2008
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Quote:
Originally Posted by 04 EDGE
live data scanner is the only way your going to figure out witch sensor is "dropping out" under 5mph causing a false abs event.
I think you've told me before, but where can i get one of these?
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Old 01-13-2008
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otc makes one for around 900 bucks
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Old 01-13-2008
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Quote:
Originally Posted by [email protected]
Which wouldnt really help me unless i cut the wires and hooked up an ohm meter while i was driving?

No, these are the static readings of the sensors at wiring connectors (C150, C160, and C455 no cutting involved). Or could be taken at the ABS module plug as well via terminals 17&18 LF, 3&4 RF, and 22&21 rear.
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Old 01-13-2008
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well christian came and i didnt realize the 4x4 and 2wd abs sensors were different.

I might have to try the ohm readings on the sensors... I'm not getting a $900 scanner....maybe I can take it to ford and ask them what the problem is, then fix it myself.
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Old 01-13-2008
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You don't check the sensors while driving. While parked unplug the sensors and read the resistance.
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Old 01-14-2008
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I used to have this problem when I had my 3" lift. I'm not sure how it corrected itself, but it did.

Brenton
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Old 01-14-2008
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Take meter readings like JJ said, then try spinning the wheel with the meter hooked up, while taking the Ohm readings.
Then switch the meter to millivolts and spin it again.
Compare sides, varying the spinning speed.

You should be able to "see" the pulses on the meter as the wheel spins. Use whichever meter setting gives you the most output, ohms or millivolts. Since your problem occurs at low speed, you should be able to spin the fronts fast enough to see the problematic side. I'd think that as the wheel slows the signal will drop off sooner on one side than the other, or one side will have a lower meter reading while spinning. That's the bad side.

Last suggestion I have is to take these meter readings at the ABS module connector AND at the sensor connector. That way you can ensure ALL the wiring is intact.
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Old 01-19-2008
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Quote:
Originally Posted by Rev
According to the Ford Manual the sensor resistance readings should be as follows:

Between terminals
.8 - 1.4 kilo-ohms (4x2) front
.38 - .48 kilo-ohms (4x4) front
.8 - 2.5 kilo-ohms rear

Between ground
Should be greater than 10,000 ohms
checked the sensors and they all seem to be getting ok readings...

what do you mean "between ground" just one of the terminals and trucks ground?
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Old 01-19-2008
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Quote:
Originally Posted by [email protected]
checked the sensors and they all seem to be getting ok readings...

what do you mean "between ground" just one of the terminals and trucks ground?

Yes, the readings are taken between the two terminals coming from the sensors and then between one of the terminals and ground. This will check for open, internal short, and or short circuit to ground. If you have the sensor removed, test between one of the terminals and the sensors body.
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Old 01-19-2008
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Quote:
Originally Posted by Rev
Yes, the readings are taken between the two terminals coming from the sensors and then between one of the terminals and ground. This will check for open, internal short, and or short circuit to ground. If you have the sensor removed, test between one of the terminals and the sensors body.
They are removed... I'll try that either in a little bit or tomorrow.

I've got 4 sensors here.... I hope at least two of them are ok... and the rest of the abs system isnt messed up.

Is there anythign under the hood I should be checking as well?
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Old 01-20-2008
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Try flexing the wires while your checking sensor. Check the pins on both connectors for any signs of corrosion and that they are making a good connection when plugged together.
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