Inspection Procedure 2

Inspection Procedure 2: ASC OFF display flashes at a rate of 2Hz.

OPERATION

When the ASC OFF display flashes at a rate of 2 Hz, the TCL control (brake control only) is prohibited.

COMMENTS ON TROUBLE SYMPTOM

This operation is performed for the following reasons and is not a malfunction.

- ASC-ECU calculates the estimated temperature of the brake pad. In general, as the brake pad temperature increases, the coefficient of friction for the brake pad becomes smaller, resulting in the reduced braking force. When the estimated temperature of the brake pad reaches the specified value or more, ASC-ECU flashes the ASC OFF indicator light at a rate of 2 Hz to warn the driver that the brake controllability by TCL is decreased by the reduced braking force. Consequently, ASC-ECU prohibits the TCL control (brake control only) until it determines that the estimated temperature of the brake pad is normal.

NOTE:
In addition to severe driving, brake pad condition and brake drag are suspected as the cause of overheating. After the ASC OFF display has turned off, check the brake pad condition and brake drag.

PROBABLE CAUSES

- Overheat of brake pad