Traction Control System
DESCRIPTIONTraction control is designed to control wheel spin when accelerating on slippery or loose surfaces. If one or both rear wheels lose traction and begin to spin during acceleration, the traction control system will rapidly apply and release the appropriate rear brake(s). It monitors brake usage to prevent brake overheating. It operates at vehicle speeds up to approximately 55 km/h (34 mph).
OPERATION
The traction control system operates as follows:
- During acceleration, if one or both rear wheels lose traction and begin to spin, the traction control system will rapidly apply and release the appropriate rear brake(s).
- The isolation valve will also close and the pump motor will run. The isolation valve permits brake operation only to the rear brake circuit by closing off the return path to the brake master cylinder.
- If the brakes are applied during traction control system operation, the anti-lock brake control module receives a signal from the stoplight switch and automatically stops traction control cycling.
- System cycling is monitored by the anti-lock brake control module. This information is stored in the keep-alive memory and cannot be erased by disconnecting the battery or module.
OVERUSE/OVERHEATING
- If the traction control system is used continually on slippery roads, the anti-lock brake control module may shut the system "OFF" to prevent overheating of the rear brakes.
- If the system shuts off, there is a cool down period required before it becomes functional again. This cool down period varies depending on brake usage during the cool down period.
- Anti-lock braking is still fully functional during the cool down period.
SHARED ABS COMPONENTS
The traction control system uses the following major ABS components:
- brake pressure control valve block
- pump motor
- anti-lock brake control module
- front brake anti-lock sensors and rear brake anti-lock sensors
DIAGNOSIS AND REPAIR
Refer to the Antilock Brake System for diagnostic procedures. Testing and Inspection