Posted: Mon Oct 08, 2012 9:03 pm Post subject: Service Traction System
Hey Guys, new member here. I've got a 2004 Impala LS with the 3800. The other day a "Service Traction System" warning came on in the message center. I've tried searching the site, but haven't had any luck. I also searched online and saw a few things saying it's most likely a bad wheel speed sensor. Has anyone else experienced this problem? If it is a bad wheel speed sensor, how do I test to see which one is faulty? Thanks in advance!
Posted: Mon Oct 08, 2012 9:35 pm Post subject: traction system
Speed sensor built into hub. yes, common problem. Could just be broken wire. Unplug connector at wheel. Use ohm meter to check sensor. Rotate wheel a bit when using meter. Open reading indicates bad sensor. Check all four hubs. Could also use scanner.
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It could be the wheel speed sensor/hub. But in all licklyhood it will be a brocken wire in one of the harness' that run to the wheels. Autozone sells a replacement harness from Dorman for like $38. you will have to cut out the old one and splice in the new one where it goes into the primary wire harness.
Orientation of teh wires from the speed sensor is very important. If you run the wire low, then it will rub on the castle nut to the tie are. Make sure the wire in on top.
I replaced the hub and speed sensor and began getting the warining lightes within a week. When I removed the sensor, the insulation on the sensor wires were worn through because they were incontact with the nut.
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