Precautions For Diagnosis
- ASC controls the brake pressure by the assistance of ECU. The symptoms described in the table below may occur during the normal ASC operation. However, they do not indicate any sign of malfunction.SYMPTOMS CHART
Symptoms Description of symptoms - When ASC operates, the operating noise is generated from the motor integrated in the hydraulic unit. (Screech)
- Noise is generated from the brake pedal together with the vibration. (Boom, boom)
- When ASC operates, the system repeats the activation and deactivation. At this time, the noise is generated from the chassis components. (Clunk: Suspension; Squeak: Tire)
These noises are generated when the system and brake pedal operate normally, and they do not indicate any sign of malfunction. - A slight shock is felt occasionally when the brake pedal is depressed lightly during the low speed driving.
- Small clicking noise is heard occasionally from the engine compartment.
This noise is generated when the system operation check <startup check performed when the vehicle speed is at few km/h (mile)> is performed, and it does not indicate any malfunction. - On snowy or gravel roads, a vehicle with ABS sometimes requires a longer braking distance compared to the one without ABS. Considering this characteristics, advise the customer to drive the vehicle safely at lower speed and not to place too much confidence on the ABS system when driving on such roads.
- The detection conditions of diagnostic trouble code differ with each diagnostic trouble code. When the trouble symptoms are rechecked, conditions described in the description for the diagnostic trouble code procedures must be satisfied.