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The TCS works on the same speed-
sensing principles as the ABS. The
TCS monitors the speed of the
wheels during acceleration. If one
drive wheel starts to spin faster than
the other, or both drive wheels spin
faster than the front wheels, the TCS
reduces engine power to minimize
wheelspin.
The TCS uses the same wheel speed
sensor assemblies used by the ABS.
An additional sensor measures
steering-wheel-angle. This senses
how far the front wheels are turned,
if at all. The TCS control unit receives
the signals from these sensors.
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When the TCS senses wheelspin, the
control unit determines how much
slippage to allow based on the differ-
ence in wheel speeds and the steer-
ing angle. It then controls the throttle
and signals the engine's ECM to
regulate ignition timing and fuel flow.
This reduces available engine power.
The control unit monitors the TCS
circuitry while driving. If it senses a
problem, the TCS indicator light on
the instrument panel goes on. The
system will then be turned off.
Traction Control System
Technical Information
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