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DTC C1257/57 Power Supply Drive Circuit: Description

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

DTC DETECTION CONDITION AND TROUBLE AREA

DTC Code	DTC Detection Condition	Trouble Area
C1257/57	There is an open in the motor system circuit (motor input circuit).	Hydraulic brake booster pump motor circuit