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not good - bad Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Wed, 7 Feb 2001 13:09:21
In Reply to: Is the ABS connected to the TCS in someway?, TimH, Tue, 6 Feb 2001 17:43:53 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The ABS has wheel sensors to determine if the wheels are turning. If a wheel isn't turning and the brakes are on, the ABS figures that wheel is locked, and relieves pressure to unlock the wheel. The ABS sends these signals to the TCS, because the TCS wants to know if one wheel is spinning faster than the others (slipping). The TCS can stop that wheel by a combination of applying brakes (via the ABS) and cutting back on the throttle. So the ABS and TCS send signals back and forth.
The ABS also sends a wheel speed signal to the speedometer/odometer. It turns out that in the early NG900's, the rubber boot on the connector to the ABS box wasn't very waterproof. Water would get in and screw things up royally. One example of that instead of getting a few pulses from the ABS box (a more pulses mean the wheel is turning faster), you get A LOT of pulses. John Moss of Saab tells of folks that washed their engines, and not only was the speedometer pegged, they ran up thousands of miles on the odometer just getting the car to the dealership.
Peel back the rubber boot on the ABS connector and make sure all is dry. Unfortunately, in some cases the ABS box was damaged by the water. This may (and hopefully may not) be the case with your car. This may require a trip to the dealer.
John Moss does note that one beneficial part of the partnership with GM is that more recent cars went to a more waterproof connector sourced by GM. But I remember him specifically telling of this problem with the early NG900s.
Sorry.
, Wed, 7 Feb 2001 13:09:21 <-- Viewing This Message
, Tue, 6 Feb 2001 19:11:24
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