C1257

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster): C1257/57: Power Supply Drive Circuit
C1257/57 - Power Supply Drive Circuit

DESCRIPTION

The motor relay (semiconductor relay) is built into the hydraulic brake booster and drives the pump motor based on a signal from the skid control ECU.





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HYDRAULIC BRAKE BOOSTER PUMP MOTOR OPERATION

(a) Turn the ignition switch to OFF.

(b) Disconnect the actuator connector (S1).

(c) Depress the brake pedal more than 20 times.

(d) Turn the ignition switch to the ON position.

(e) Check the hydraulic brake booster pump motor operation.

OK:

Hydraulic brake booster pump operates.

NG -- REPLACE MASTER CYLINDER SOLENOID
OK -- Continue to next step.

2. RECONFIRM DTC

(a) Turn the ignition switch to OFF.

(b) Reconnect the actuator connector (S1).

(c) Turn the ignition switch to the ON position.

(d) Clear the DTCs Vehicle Stability Control System (for Hydraulic Brake Booster).

(e) Check if the same DTCs are recorded.





B -- END

A -- REPLACE MASTER CYLINDER SOLENOID