Traction Control System (TCL)

GENERAL DESCRIPTION

FEATURES
The traction control system (TCL) is adopted for vehicles with 3.8L engine.
^ When a drive wheel is judged to be slipping by some reasons such as excessive accelerator pedal depression on a low friction road, the TCL applies brake force to the slipping drive wheel or lowers the engine output to suppress the drive wheel slippage.
^ Fail-safe function ensures safety is maintained
^ Diagnostic function provides improved serviceability
^ To shorten the lines and enhance data transaxle reliability, communication with other ECU is performed over a CAN (Controller Area Network).

CONSTRUCTION DIAGRAM:

SYSTEM CHECK SOUND
When starting the engine, a thudding sound can sometimes be heard coming from the engine compartment. This is a normal sound during the ABS/TCL self-check.

ABS/TCL OPERATION SOUNDS AND SENSATIONS
During normal operation, the ABS/TCL makes several sounds that may seem unusual at first:
^ A whining sound is caused by the ABS/TCL hydraulic unit motor.
^ When pressure is applied to the brake pedal, the pulsation of the pedal causes a scraping sound.
^ When the brakes are applied firmly, the ABS/TCL operates, rapidly applying and releasing the brakes many times per second. This repeated application and release of braking forces can cause the suspension to make a thumping sound and the tires to squeak.