Master Cylinder Pressure Sensor Malfunction - Electronically Controlled Brake System

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

DESCRIPTION

The master cylinder pressure sensor and the wheel cylinder pressure sensor are built into the brake actuator. They measure the master cylinder pressure and the wheel cylinder pressure and send the data to the skid control ECU.

DTC C1281/81 can be deleted when the master cylinder pressure sensor sends a master cylinder pressure signal or the Test Mode ends. DTC C1281/81 is output only in the Test Mode.













WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU or brake actuator, perform initialization of linear solenoid valve and calibration Initialization.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR)

(a) Disconnect the A19 and A21 ECU connectors.

(b) Disconnect the A27 actuator connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(d) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Select the Data List mode on the Techstream.

ABS/VSC/TRAC





(d) Check the output value of the master cylinder pressure sensor on the Techstream display.

OK:

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

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

3. CHECK PRESSURE SENSOR OPERATION

(a) Check the pressure sensor operation On-Vehicle Inspection.

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

4. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Perform the road and braking test.

(c) Check if the same DTCs are recorded Reading and Clearing Diagnostic Trouble Codes.

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

Result





B -- END
A -- Continue to next step.

5. CHECK FREEZE FRAME DATA

(a) Check the information code from the "FREEZE FRAME DATA" memorized when the DTCs (C1246/46 and C1364/61) are stored Freeze Frame Data.

Result





B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

A -- REPLACE SKID CONTROL ECU Removal