ABS light
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ABS light
My ABS light on my 99 Expedition comes on after 15-20 minutes of driving.
It always resets when the vehicle is turned off.
Any thoughts? I was guessing maybe a wheel sensor?
Best method of diagnosis?
Thanks,
Scottek
It always resets when the vehicle is turned off.
Any thoughts? I was guessing maybe a wheel sensor?
Best method of diagnosis?
Thanks,
Scottek
Senior User
Joined: Sep 2004
Posts: 150
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From: Dayton, OH
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From: Franklin, NC
Originally Posted by ohioclint
Spend the $23 and change the rear sensor.
My .02
Clint
My .02
Clint
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From: St Louis
Before spending 2 cents, pull the sensor and ohm it. A good one usually reads between 1000 and 1500 ohms. Bad ones are usually open. Same for the front ones.
However, he does not have an open sensor. Read his symptoms carefully, the fault light comes on only after extended driving. A bad sensor (hard fault) will cause the ABS light to come on and stay on immediately after POST.
Steve
However, he does not have an open sensor. Read his symptoms carefully, the fault light comes on only after extended driving. A bad sensor (hard fault) will cause the ABS light to come on and stay on immediately after POST.
Steve
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Originally Posted by projectSHO89
Before spending 2 cents, pull the sensor and ohm it. A good one usually reads between 1000 and 1500 ohms. Bad ones are usually open. Same for the front ones.
However, he does not have an open sensor. Read his symptoms carefully, the fault light comes on only after extended driving. A bad sensor (hard fault) will cause the ABS light to come on and stay on immediately after POST.
Steve
However, he does not have an open sensor. Read his symptoms carefully, the fault light comes on only after extended driving. A bad sensor (hard fault) will cause the ABS light to come on and stay on immediately after POST.
Steve
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Joined: Jan 2004
Posts: 19,760
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From: St Louis
A voltage check of any of the ABS sensor requires the drivetrain to be in motion. Best to leave that to a properly trained technician....
I'd just pull the rear sensor and ohm it. It is, by far, the most common failure and reason for "hard" ABS fault lights. There is plenty more that can and does go wrong, though .....
Steve
I'd just pull the rear sensor and ohm it. It is, by far, the most common failure and reason for "hard" ABS fault lights. There is plenty more that can and does go wrong, though .....
Steve
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Joined: Jan 2004
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From: St Louis
Probably contamination on one of the wheel sensors, possibly a front wheel bearing, or an improper sensor to tone ring gap..... A resistance measurement will show the sensor to be good.
Really need the code(s) so you're not shooting in the dark.
Sorry
Steve
Really need the code(s) so you're not shooting in the dark.
Sorry
Steve
Senior User
Joined: Jul 2004
Posts: 272
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+1 on changing the sensor on the rear diff. They are so often the cause of this problem and are so cheap to do yourself $25 bucks +/- that it's worth the bet just to save the $100 plus your will pay the dealer...