C1257

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1257/57: Power Supply Drive Circuit

DTC C1257/57 - Power Supply Drive Circuit

DESCRIPTION

The motor relay (semiconductor relay) is built in the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU.






INSPECTION PROCEDURE
NOTE:
When replacing the master cylinder solenoid, perform zero point calibration Calibration.

PROCEDURE

1. CHECK PUMP MOTOR OPERATION
(a) Turn the ignition switch off.
(b) Disconnect the skid control ECU (S37) connector.
(c) Depress the brake pedal more than 20 times.
(d) Check pump motor operation.
OK:
Pump motor normally operates.
NG -- REPLACE MASTER CYLINDER SOLENOID
OK -- Continue to next step.
2. RECONFIRM DTC
(a) Turn the ignition switch off.
(b) Reconnect the skid control ECU (S37) connector.
(c) Turn the ignition switch to the ON position.
(d) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(e) Check if the same DTC is detected Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- END
A -- REPLACE MASTER CYLINDER SOLENOID