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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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  Jim Grant's Tech TipsJim Grant's Tech Tips
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 ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

89 GMC 1500 4x4, ABS and Speedo Problems
Q: I own an 89 GMC 1500 4x4 and have two problems. First is the speedometer, it works on and off. I wondered if you had any troubleshooting tips as to where to look. Also, my brake light continually flashes - it has brand new brakes and I tried disconnecting the battery but it continues. I would appreciate some input.

A: It is likely that the Anti-Lock Brake System is missing an input. That input is the same input that makes the speedometer work. Have your technician check the vehicle speed sensor (VSS). The VSS is located at the back of the transmission and provides the information needed for the ABS and speedometer to function.

 
     
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