ABS light comes on

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May 4, 2011 | 07:39 PM

lspall

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ABS light comes on

Symptoms -
1. Turn the key to "on" position all warning lights come on then go out including the ABS light.
2. Start the engine all warning lights come on then go out including the ABS light.
3. Shift into gear no warning lights.
4. Start driving, after about 20 to 30 feet ABS light comes on.

Any ideas ?

May 5, 2011 | 07:47 AM

c_hohensee

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What vehicle and year? The most common cause is the rear speed sensor on the rear differential depending on the vehicle.

May 5, 2011 | 09:24 AM

lspall

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2002 Expedition XLT 4x4 w/5.4 engine

May 5, 2011 | 11:43 AM

pdqford

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From: Central NYS

I'd look for a scan tool (or someone) able to read ABS codes.

May 6, 2011 | 08:04 AM

c_hohensee

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Quote:

Originally Posted by pdqford

I'd look for a scan tool (or someone) able to read ABS codes.

I agree with that, but at <$20 the rear sensor is a good bet if you need to pay to have it scanned.

May 11, 2011 | 12:22 PM

r2millers

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Joined: Sep 2010

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From: Southern Cal

will the typicasl scanner detect abs issues? i thought it was a completely different detection system.

May 11, 2011 | 04:38 PM

alloro

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You need an ABS code scanner. The one that scans engine codes will not work.

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May 16, 2011 | 02:33 PM

lspall

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SOLVED !!!!!!

Found a place that would do the ABS scan for free, the scan revealed that the passenger front ABS sensor was giving an erratic reading. Since I didn't have the $150 for a new sensor I did a little troubleshooting and found the cause of the problem. Suspecting a broken wire I took the sensor off and cleaned it up, I then put my ohm meter on it (putting each test lead on each prong of the connector) and got a ohm reading of 425 ohms. Not knowing what the range should be, I held the the test leads on the prongs and had the wife bend different sections of the wire. Then SURPRISE !!, found a section that would read anywhere from 0 to 1500 ohms depending on which way the wife bent or rotated that section of wire. So knowing what section was damaged I put the sensor back on the Expedition and positioned that section of wire as straight as possible then went for a test drive. NO LIGHT CAME ON YAAAAAY !!!!