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Because Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Fri, 7 Mar 2003 14:33:30
In Reply to: TCS and ABS lights on then off, Cavan, Fri, 7 Mar 2003 12:52:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The TCS uses the ABS sensors to do its job. Of course, the ABS uses the ABS sensors to do the ABS job.
If the ABS detects what it thinks is a fault, it disables the ABS and turns on the ABS light. Since the TCS needs the same sensors, it turns on the TCS light to let you know that TCS is disabled. You don't go into limp-home mode because Limp-home is only for faults that could cause acceleration, like a throttle control problem.
When you do an e-brake turn, the rear wheels stop turning. The ABS system is continually checking itself. One of the things it does is look at the speeds of all of the wheels and compares them. Of course, the ABS knows when you press on the brake pedal. When you do an e-brake turn, the rear wheels stop turning, but you don't hit the pedal. As far as the ABS knows, the rear ABS wheel sensors just died, because there is no signal from them, yet the front wheels say that you're moving. The ABS doesn't get the e-brake signal.
The ABS signals a fault, and the TCS goes along with it. Once you release the e-brake, the rear wheels start turning. Once the ABS sees the rear wheels spinning at the right speed, it turns off the ABS, and the TCS goes along with it. It takes a few seconds because that's just how the test runs.
Make sense?
posted by 192.249....
, Fri, 7 Mar 2003 14:33:30 <-- Viewing This Message
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