Traction Control/Active Skid Control System (TCL/ASC)

GENERAL DESCRIPTION
The Mitsubishi active skid and traction control system (M-ASTC) consists of the following components; ABS sensors, stoplight switch, hydraulic unit in hydraulic brake booster (HBB), master cylinder pressure sensor, M-ASTC-ECU, ABS rotor, steering wheel sensor, G and yaw rate sensor, PCM, Active skid control system operation indicator light/Active traction control system operation indicator light, Active skid control system OFF indicator light, 4WD indicator light, HBB buzzer, brake system warning light and Anti-lock braking system warning light. If a problem occurs in the system, the malfunctioning components can be identified and the trouble symptoms will be memorized by the diagnostic function. In addition, reading of diagnostic trouble codes and data list and actuator testing are possible by using the Scan Tool.

The M-ASTC-ECU runs a self-check for three seconds upon start-up (also ignition switch ON, engine stopped). The anti-lock braking system warning light should be illuminated during the self-check and turn off when the self-check completes.








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 Active skid control system self-check.

Active Skid Control System
Operation Sounds and Sensations During normal operation, the Active skid control system makes several sounds that may seem unusual at first:
^ A whining sound is caused by the ABS hydraulic unit motor.
^ When pressure is applied to the brake pedal, the pulsation of the pedal causes a scraping sound.