Electronically Controlled Brake System

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1315/31,C1316/32,C1352/21-C1359/28: SMC1 Changeover Solenoid Malfunction
C1359/28 - Rear Decreasing Pressure Solenoid LH 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 (SMC1/2) 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 hydraulic pressure to the non-assisted brake wheel cylinders during the fail safe due to a system malfunction.









WIRING DIAGRAM









INSPECTION PROCEDURE

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

PROCEDURE

1. INSPECT BRAKE ACTUATOR ASSEMBLY

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.





Text in Illustration





(b) Disconnect the brake actuator connector.

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

HINT
Check the brake actuator assembly when it is cooled down.

Standard Resistance:





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

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

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.





Text in Illustration





(b) Disconnect the skid control ECU connectors.

(c) 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) Reconnect the skid control ECU connectors and the brake actuator connector.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the power switch on (READY).

(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- REPLACE SKID CONTROL ECU Removal

A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting