C1246

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1246/46: Master Cylinder Pressure Sensor Malfunction
C1246/46 - Master Cylinder Pressure Sensor Malfunction

DESCRIPTION

The master cylinder pressure sensor and pressure control sensor are connected to the skid control ECU in the master cylinder solenoid.









INSPECTION PROCEDURE

NOTICE:
When replacing the master cylinder solenoid, perform zero point calibration Programming and Relearning.

HINT
When C1249/49 is output together with C1246/46, inspect and repair the trouble areas indicated by C1249/49 first.

PROCEDURE

1. READ VALUE USING TECHSTREAM (MASTER CYLINDER SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

ABS/VSC/TRAC





(d) Check that the master cylinder pressure value of the master cylinder pressure sensor displayed on the Techstream changes when depressing the brake pedal.

Result





C -- RECONFIRM DTC

A -- REPLACE MASTER CYLINDER SOLENOID
B -- Continue to next step.

2. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

(a) Check the brake pedal height Adjustments.

(b) Check the stop light switch installation Adjustments.

OK:

The brake pedal and stop light switch are normal.

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

3. INSPECT SKID CONTROL ECU (STP TERMINAL)

(a) Disconnect the A24 skid control ECU connector.





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

Standard Voltage:





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

4. RECONFIRM DTC

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

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

HINT
Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result





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

A -- REPLACE MASTER CYLINDER SOLENOID