Electronically Controlled Brake System

DTC C1252/52 Brake Booster Pump Motor on Time Abnormally Long

DESCRIPTION

DTC Detection Condition:

The skid control ECU detects decreases in the accumulator pressure according to the data from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay. The skid control ECU usually drives the motor relay 1 for Electronically Controlled Brake control, and the motor relay 2 for ABS control. If either of them is malfunctioning, the other will substitute.

Wiring Diagram:

Step 1:

Step 1(Continued)-2:

Step 3-4:

Step 5-6:

Step 7-8:

Step 9:

Step 10-11:

Step 11(Continued):

INSPECTION PROCEDURE

NOTE: When replacing the skid control ECU or brake actuator assembly, perform initialization of linear solenoid valve and calibration. Initialization