C1246

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

DTC C1246/46 - Master Cylinder Pressure Sensor Malfunction

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 Calibration.

PROCEDURE

1. READ VALUE USING TECHSTREAM (MASTER CYLINDER PRESSURE SENSOR)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position and push Techstream main switch ON.
(c) Select "Data List" mode on Techstream.

ABS/VSC/TRAC





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






C -- RECONFIRM DTC
A -- REPLACE MASTER CYLINDER SOLENOID
B -- Continue to next step.
2. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION
(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 AND/OR STOP LIGHT SWITCH
OK -- Continue to next step.
3. INSPECT SKID CONTROL ECU (STP TERMINAL)




(a) Disconnect the skid control ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)
OK -- Continue to next step.
4. 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.
HINT: Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result:






B -- END
A -- REPLACE MASTER CYLINDER SOLENOID