Electronically Controlled Brake System

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1257/57: Power Supply Drive Circuit
C1257/57 - Power Supply Drive Circuit

DESCRIPTION

The skid control ECU detects a drop in accumulator pressure according to the signals from the accumulator pressure sensor, then operates and stops the motor relay as well as the pump motor.

The skid control ECU troubleshoots the built-in motor relay drive circuit, and stores this DTC when a malfunction is detected.





INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve Initialization.

HINT
When C1241/41, C1242/42 and/or C1253/53 are output together with C1257/57, inspect and repair the trouble areas indicated by C1241/41, C1242/42 and/or C1253/53 first C1241 or C1252).

PROCEDURE

1. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

(a) Replace the skid control ECU (brake booster with master cylinder assembly) Removal.

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