C1456

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1422, C1456: Master Cylinder Pressure Sensor Zero Point High Malfunction


DESCRIPTION

Refer to DTCs C1421, C1423, C1424, C1455, C1457 and C1458 C1421.





WIRING DIAGRAM

Refer to DTC C1380 C1380.

INSPECTION PROCEDURE

NOTICE:
- When replacing the master cylinder solenoid, perform calibration Programming and Relearning.
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. READ VALUE USING TECHSTREAM (STOP LIGHT SW) C1380

NG -- CHECK TERMINAL VOLTAGE (STOP LIGHT SWITCH POWER SOURCE TERMINAL)
OK -- Continue to next step.

2. 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.

3. RECONFIRM DTC

(a) Clear the DTC 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 a braking test (decelerate the vehicle by depressing the brake pedal).

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

Result





B -- REPLACE MASTER CYLINDER SOLENOID Disassembly

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

4. CHECK TERMINAL VOLTAGE (STOP LIGHT SWITCH POWER SOURCE TERMINAL)

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

(b) Disconnect the A5 stop light switch connector.

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





Standard Voltage:





Text in Illustration





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

5. INSPECT STOP LIGHT SWITCH

(a) Remove the stop light switch Removal.

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





Standard Resistance:





Text in Illustration





NG -- REPLACE STOP LIGHT SWITCH ASSEMBLY Removal
OK -- Continue to next step.

6. CHECK TERMINAL VOLTAGE (STP) C1380

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MASTER CYLINDER SOLENOID Disassembly