9-3 XWD (9440) L4-2.0L Turbo (B207R) (2009)
Traction Control Module: Description and Operation
Control Module, ESP (671), Including Hydraulic Unit
Control Module, ESP (671), Including Hydraulic Unit
Location
ESP control module (671)
Main use
The control module continually calculates wheel speed for all four wheels and regulates by applying the brakes or sending an engine torque limitation
request if there is there is a difference between wheel speeds or any limit value is exceeded. The hydraulic unit provides brake pressure to the wheel
brakes and holds or evacuates brake fluid as necessary with internal unit valves.
Type
The control module contains
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A main processor which regulates ABS function and some diagnostics monitoring.
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A slave processor which regulates TCS function, parts of the diagnostics monitoring, continuous monitoring of the main processor as well as