C1422

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1422: Master Cylinder Pressure Sensor Zero Point High Malfunction
C1422 - Master Cylinder Pressure Sensor Zero Point High Malfunction

DESCRIPTION

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









WIRING DIAGRAM

Refer to DTC C1425 C1425.

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration and store system information Calibration.

HINT
When DTC C1425 and/or C1426 is output together with DTC C1422, inspect and repair the trouble areas indicated by DTC C1425 and/or C1426 first C1425, or C1426).

PROCEDURE

1. CHECK STOP LIGHT OPERATION

(a) Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

OK:





NG -- INSPECT STOP LIGHT CIRCUIT Symptom Related Diagnostic Procedures
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

(a) Connect the Techstream to the DLC3.

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

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

ABS/VSC/TRAC





(d) Check that the stop light condition observed on the Techstream changes according to brake pedal operation.

OK:

The Techstream displays ON or OFF according to brake pedal operation.

NG -- INSPECT SKID CONTROL ECU (STP1 TERMINAL)
OK -- Continue to next step.

3. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

(a) Turn the engine switch off.

(b) Check the brake pedal height and stop light switch installation Adjustments.

OK:

The brake pedal height and stop light switch installation are normal.

NG -- ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH Adjustments
OK -- Continue to next step.

4. RECONFIRM DTC

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

(b) Start the engine.

(c) Drive the vehicle at a speed of 40 km/h (25 mph) or more and perform braking test (decelerate the vehicle by depressing the brake pedal).

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

Result:





B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

A -- CHECK FOR INTERMITTENT PROBLEMS Electronic Circuit Inspection Procedure

5. INSPECT SKID CONTROL ECU (STP1 TERMINAL)

(a) Turn the engine switch off.





(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

(c) Disconnect the skid control ECU connector.

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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT)

OK -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal