Master Cylinder Pressure Sensor Malfunction - Vehicle Stability Control System

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

Master cylinder pressure sensor is connected to the skid control ECU in the ABS & TRACTION actuator assembly.
DTC C1281/81 is output only in the test mode (SIGNAL CHECK).









INSPECTION PROCEDURE

NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration Programming and Relearning.

PROCEDURE

1. INSPECT STOP LIGHT OPERATION
(a) Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal is released.
OK:






NG -- CHECK STOP LIGHT CIRCUIT
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (MASTER CYLINDER PRESSURE SENSOR)
(a) Connect Techstream to the DLC3.
(b) Start the engine.
(c) Select "DATA LIST" on Techstream.

DATA LIST: ABS / VSC / TRAC





(d) Check that the brake fluid pressure value of the master cylinder pressure sensor observed on Techstream changes when the brake pedal is depressed.
OK:
When the pedal is depressed, voltage displayed on Techstream increases.

NG -- REPLACE ABS & TRACTION ACTUATOR ASSEMBLY
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH OPERATION)
(a) Connect Techstream to the DLC3.
(b) Start the engine.
(c) Select "DATA LIST" on Techstream.

DATA LIST: ABS / VSC / TRAC





(d) Check that the stop light observed on Techstream changes when the brake pedal is depressed.
OK:
When the brake pedal is depressed, Techstream displays "ON".

NG -- REPLACE ABS & TRACTION ACTUATOR ASSEMBLY
OK -- Continue to next step.

4. RECONFIRM DTC
(a) Clear the DTC.
(b) Start the engine.
(c) At a speed of 18 mph (30 km/h) or more, drive the vehicle and perform braking test (decelerate the vehicle by depressing the brake pedal).
(d) Check that the same DTC is recorded.
Result:





HINT: These DTCs may be restored due to a malfunction in the connector terminal connection, etc.

B -- REPLACE ABS & TRACTION ACTUATOR ASSEMBLY
A -- END