What's Right ????

[southtowniceman]

I have a 97 Tahoe,4 wd, (disc front drum rear) that is experiencing ABS problems, and I want to check out the front wheel sensors. I searched the forum and found variations in what the sensor ohm readings should be. Some say 855-1230 and others say 1450-1800 ohms. Who's right? Does anyone have a chevy service manual that covers that year vehicle and denotes the correct ohm value for the sensors. Also, is there a difference between the left and right sensors? If so, WHY? Thanks
Tom

[horse482]

My manual just says to check for a voltage increase as you spin the wheel. The right and left sensor show to be different, which is funny because if you replace the hub assy, it comes with a new sensor and there is not a right and left listed there, go figure.

[maxwedge]

To eliminate guess work, get it scanned on an abs function scanner and look at comparative wheel speeds for the suspect sensor.

[southtowniceman]

About 30,000 miles ago, the dealer replaced both front hubs, saying there was play in the bearings causing the sensor to activate the abs. I took one of the hubs and checked the bearings myself. I've worked on equipment that had bearings that rotated hundreds of times faster, and to me there was nothing wrong with the bearings. The Delco box I got did designate left hand hub, but it came with the sensor attached. Some where in the forum it also stated that the sensors have to stay clean. The gear,if you will,that's attached to the bearing race,and creates the electrical impulses from the magnet in the sensor, is right in there with the grease. It can't stay clean.
The first time I had problems with the abs, I had someone other than a dealer do a scan and they said one of the sensors showed out of calibration, but they wouldn't guarantee replacing the sensor would correct the problem.That's why I went to the dealer. I don't really want to go that route again if I can help it. If I decide to eliminate the abs system on this vehicle, what's the best way? I pulled the fuse the last time to be sure my problem was in the abs system, but I had a check engine light come on. The code showed a problem with the torque converter. Go figure. Put the fuse back in and no more check engine light.