C1364

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1246/46, C1281/81, C1364/61: Master Cylinder Pressure Sensor Malfunction


DESCRIPTION

The regulator pressure sensor and the wheel cylinder pressure sensor are built into the brake actuator, and measure the regulator pressure and the wheel cylinder pressure sent to the skid control ECU.

DTC C1281/81 will be cleared when the regulator pressure sensor sends a regulator pressure signal or when Test Mode ends. DTC C1281/81 is output only in Test Mode.





INSPECTION PROCEDURE

NOTICE:
When replacing the brake booster with master cylinder (skid control ECU or brake actuator), perform initialization and calibration of the linear solenoid valve Initialization.

PROCEDURE

1. CHECK STOP LIGHT SWITCH INSTALLATION

(a) Check the protrusion of the rod Installation.

OK:

Stop light switch is installed properly.

HINT
If the stop light switch is not installed properly, adjust the protrusion of the rod before proceeding to the next step.

NG -- ADJUST PROTRUSION OF ROD Installation
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (REGULATOR PRESSURE SENSOR)

(a) Set a pedal effort gauge and LSPV gauge to the rear wheel Component Tests and General Diagnostics.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Select the Data List on the Techstream Data List / Active Test.

ABS/VSC/TRAC





(e) Check the output value of the regulator pressure sensor as the brake pedal is depressed.

Standard Voltage:





NG -- REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Removal
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (WHEEL CYLINDER PRESSURE SENSOR)

(a) Set a LSPV gauge to the front wheel Component Tests and General Diagnostics.

(b) Select the Data List on the Techstream Data List / Active Test.

ABS/VSC/TRAC





(c) Check the output value of the wheel cylinder pressure sensor at each hydraulic pressure during electronically controlled brake system control.

Standard Voltage:

for Front Wheel Cylinder Pressure Sensor LH
for Front Wheel Cylinder Pressure Sensor RH










NG -- REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Removal
OK -- Continue to next step.

4. READ VALUE USING TECHSTREAM (BRAKE PEDAL STROKE SENSOR AND PRESSURE SENSOR COMPARISON)

(a) Set a pedal effort gauge and LSPV gauge to the front and rear wheels Component Tests and General Diagnostics.

(b) Select the Data List on the Techstream Data List / Active Test.

ABS/VSC/TRAC





(c) Check the output value of the brake pedal stroke sensor as the brake pedal is depressed.

Standard Voltage:





NG -- REPLACE BRAKE PEDAL STROKE SENSOR Removal
OK -- Continue to next step.

5. RECONFIRM DTC

(a) Turn the power switch off.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Perform a road test.

(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Removal

A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting