C1246

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

DTC C1246/46 - Master Cylinder Pressure Sensor Malfunction

DESCRIPTION

Master cylinder pressure sensor is connected to the skid control ECU in the actuator.






INSPECTION PROCEDURE

PROCEDURE

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

ABS / VSC / TRAC:





(d) Check that the brake fluid pressure value of the master cylinder pressure sensor indicated on Techstream, changes when the brake pedal is depressed.
OK:
Brake fluid pressure value should change.
NOTE: When replacing the brake actuator assembly, perform zero point calibration .

NG -- INSPECT SKID CONTROL ECU (STP1 TERMINAL)
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY
2. INSPECT SKID CONTROL ECU (STP1 TERMINAL)
(a) Disconnect the skid control ECU connector.





(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:





NOTE: When replacing the brake actuator assembly, perform zero point calibration .

NG -- REPAIR OR REPLACE STOP LIGHT SWITCH CIRCUIT
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY