C1315

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1315/31, C1316/32, C1352/21-C1359/28: SMC1 Changeover Solenoid Malfunction


DESCRIPTION

Each solenoid adjusts pressure which affects each wheel cylinder according to signals from the skid control ECU and controls the vehicle.

The master cut solenoid (SMC 1/2) is closed and blocks the master cylinder pressure from the electronically controlled brake system control pressure when the system is normal. The master cut solenoid is open and sends the master cylinder fluid pressure to the non-assisted brake wheel cylinders during the fail-safe operation when the system is malfunctioning.













WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. INSPECT BRAKE ACTUATOR

(a) Disconnect the A27 actuator connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE BRAKE ACTUATOR Removal
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR)

(a) Disconnect the A19 and A21 ECU connectors.

(b) Disconnect the A27 actuator connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(d) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the engine switch on (IG).

(c) Check if the same DTCs are recorded Reading and Clearing Diagnostic Trouble Codes.

HINT
Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result





B -- REPLACE SKID CONTROL ECU Removal

A -- END