C1155

C1155

Description
When a fluid level drop in the master cylinder reservoir is detected, the signal is input to the brake ECU. When the DTC for the fluid level drop is memorized, the warning is canceled and the DTC is not stored if the fluid level returns to normal.

C1155:

Diagnosis Procedure

CAUTION:
When replacing the brake ECU, perform initialization of linear solenoid valve and calibration.

NOTE:
When releasing the parking brake, set the chocks to hold the vehicle for safety.

1.CHECK BRAKE FLUID LEVEL IN RESERVOIR
Check that the brake fluid level is sufficient.

NOTE:
^ If the fluid level drops, check for a fluid leak, and repair if found.
^ If no leak exists, add and adjust fluid and then check that the trouble code is not output again.
^ Brake fluid level is proper.

Is the inspection result normal?
YES >> GO TO 2.
NO >> Check and repair brake fluid leakage or add fluid.

2.INSPECT BRAKE FLUID LEVEL SWITCH
1. Remove the reservoir tank cap.
2. Disconnect the brake fluid level switch.
3. Measure the resistance according to the value(s) in the table below.

NOTE:
A float is located inside the reservoir. Its position can be changed by increasing or decreasing the level of brake fluid.





NOTE:
If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.

Is the inspection result normal?
YES >> GO TO 3.
NO >> Replace brake master cylinder reservoir assembly (brake fluid level switch).

3.CHECK HARNESS AND CONNECTOR (BRAKE ECU - BRAKE FLUID LEVEL SWITCH)
1. Disconnect the brake ECU connector.
2. Measure the resistance according to the value(s) in the table below.





Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace harness or connector.

4.RECONFIRM DTC
1. Turn the ignition switch OFF.
2. Reconnect the brake fluid level switch connector.
3. Clean the DTC.
4. Turn the ignition switch ON.
5. Check if the same DTC is recorded.

Result:

NOTE:
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step.

A >> Check for intermittent problems (symptom simulation).
B >> Replace brake ECU.

Special Repair Requirement

1.ZERO ADJUSTMENT FOR EACH SENSOR AND OFFSET LEANING FOR LINEAR SOLENOID VALVE
After erasing brake ECU memories, perform zero adjustment of following sensors and initialization of linear solenoid valve.
^ Steering angle sensor: BRC-9, "PERFORM ZERO POINT OF STEERING ANGLE SENSOR: Description". Testing and Inspection
^ Yaw rate/side/decel G sensor: BRC-8, "PERFORM ZERO POINT OF YAW RATE/SIDE/DECEL G SENSOR: Description". Testing and Inspection
^ Brake stroke sensor: BRC-9, "PERFORM ADJUSTMENT OF STROKE SENSOR: Description". Perform Adjustment of Stroke Sensor
^ Linear solenoid valve: BRC-7, "PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION: Description". Perform Initialization of Linear Solenoid Valve and Calibration
>> END