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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

'99 Chevy Silverado, ABS problem

Q: My ‘99 Chevy Silverado pick-up’s ABS system does not work at low speeds, approximately at 5mph or less. The result is an incredible shutter in the vehicle and loss of braking. I have talked to several people who have seen the same problem. The dealer says he can realign and clean everything up but will not guaranty it will fix the problem.

- Kevin M.

A: It doesn’t sound as if your ABS system isn’t working, it sounds more like it’s working too much! My first suggestion is to have a technician temporarily disable the ABS system and drive the vehicle. If the brake operation returns to normal then an inspection of the wheel speed sensors are in order. We’ve been seeing a speed sensor related problem that will not set an ABS computer code or if a code is set it is unrelated to the problem. Might I suggest this approach? Have the repair facility connect a computer scan tool and monitor the wheel speed information being reported by the ABS computer. What we’ve found is at about 5 to 6 MPH, if there is a wheel speed sensor problem, there will be a sudden drop in speed at one or more of the wheels reported by the ABS computer. The wheel speed sensor that shows the drop in speed when the others don’t, is the suspect sensor. When the ABS computer sees the reported drop in wheel speed and you step on the brake (even lightly) the ABS system will become active and start relieving the brake pressure to the wheel that it perceives as not turning. I don’t know about that sensor realignment line your being fed. About all you can do with the sensors on your vehicle is make sure they’re clean, free of bits of metal on the magnet of the sensor and that they’re bolted in correctly. More often than not the problem you’re having is the result of bad information. A new wheel speed sensor may be the fix.

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