C1281

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1246/46: Master Cylinder Pressure Sensor Malfunction

DTC C1246/46 - Master Cylinder Pressure Sensor Malfunction

DTC C1281/81 - Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC)

DESCRIPTION

The master cylinder pressure sensor is connected to the skid control ECU in the master cylinder solenoid.









INSPECTION PROCEDURE
NOTE: When replacing the master cylinder solenoid, perform zero point calibration Programming and Relearning.

PROCEDURE

1. READ VALUE USING DATA LIST (MASTER CYLINDER PRESSURE SENSOR)
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the tester on.
(d) Select the following menu items: Chassis / ABS/VSC/TRAC/ Data List

DATA LIST: ABS/VSC/TRAC





(e) Check that the master cylinder pressure value of the master cylinder pressure sensor displayed on the Techstream changes when the brake pedal is depressed.
Result:






C -- REPLACE HYDRAULIC BRAKE BOOSTER
B -- CHECK BRAKE PEDAL HEIGHT
A -- Continue to next step.
2. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check if the same DTC is detected Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- END
A -- REPLACE MASTER CYLINDER SOLENOID
3. CHECK BRAKE PEDAL HEIGHT
(a) Check the brake pedal height.
(b) Check the stop light switch installation.
OK:
The brake pedal and stop light switch are normal.
NG -- ADJUST BRAKE PEDAL HEIGHT
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (STP TERMINAL)




(a) Disconnect the skid control ECU connector.
(b) Measure the voltage.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Check if the same DTC is detected Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- END
A -- REPLACE MASTER CYLINDER SOLENOID