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.





VM/C1 (VCM): Master Cylinder Pressure Sensor Power Supply Output
PM/C1 (PMC): Master Cylinder Pressure Sensor Signal Input
M/C1 GND: Master Cylinder Pressure Sensor Ground





INSPECTION PROCEDURE

HINT: Start the inspection from step 1 when using a intelligent tester and start from step 3 when not using Techstream.

PROCEDURE

1. READ VALUE USING DATA LIST (MASTER CYLINDER PRESSURE SENSOR)
(a) Connect Techstream to the DLC3.
(b) Start the engine.
(c) Turn Techstream ON.
(d) Select the Data List mode on Techstream.

ABS/VSC/TRAC





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





C -- REPLACE MASTER CYLINDER SOLENOID
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 DTCs are detected.





B -- END
A -- REPLACE MASTER CYLINDER SOLENOID
3. CHECK BRAKE PEDAL HEIGHT
(a) Check the brake pedal height.
(b) Check the stop lamp switch installation.
OK:
The brake pedal and stop lamp 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:





(c) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Clear the DTCs (Reading and Clearing Diagnostic Trouble Codes).
(b) Check if the same DTCs are detected.





B -- END
A -- REPLACE MASTER CYLINDER SOLENOID