Vehicle Stability Control System (For BOSCH Made)

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for BOSCH Made): C1246/46: Master Cylinder Pressure Sensor Malfunction
C1246/46 - Master Cylinder Pressure Sensor Malfunction

DESCRIPTION

The master cylinder pressure sensor is connected to the skid control ECU in the brake actuator assembly.









INSPECTION PROCEDURE

HINT
Check the condition of each related circuit connector before troubleshooting Electronic Circuit Inspection Procedure.

PROCEDURE

1. CHECK 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 -- INSPECT STOP LIGHT CIRCUIT
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (MASTER CYLINDER PRESSURE SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Select the "Data List" mode on the Techstream Data List / Active Test.

ABS / VSC / TRAC





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

OK:

When the pedal is depressed, voltage displayed on the Techstream increases.

NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

(a) Select the "Data List" mode on the Techstream Data List / Active Test.

ABS / VSC / TRAC





(b) Check that the stop light condition observed on the Techstream changes when the brake pedal is depressed.

OK:

When the brake pedal is depressed, the Techstream displays "ON".

NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
OK -- Continue to next step.

4. RECONFIRM DTC

(a) Clear the DTC Vehicle Stability Control System (for BOSCH Made).

(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 if the same DTC is recorded Vehicle Stability Control System (for BOSCH Made).

HINT
Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result:





B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System