DTC C1742: Wheel Cylinder Pressure Sensor

DTC detecting condition: 

• A fault is detected if the condition that supply voltage for the fluid pressure sensor is out of normal judgment range continues for predetermined time.
• A fault is detected if the communication status of fluid pressure sensor is abnormal.
• A fault is detected if the data of fluid pressure sensor is abnormal.
• A fault is detected if the offset value of fluid pressure sensor signal exceeds a predetermined judgment value.
• A fault is detected if a difference between fluid pressures for the wheels exceeds a predetermined judgment value.
• A fault is detected if master cylinder pressure and fluid pressures for the wheels exceed predetermined judgment values.

Trouble symptom: 

EyeSight does not operate.

1. CHECK STOP LIGHT SWITCH CIRCUIT AND INSTALLATION CONDITION  .

   Check the stop light switch circuit and the installation condition.

   Is the check result OK?

   Yes  : Go to  2.

   No  : Repair the stop light switch circuit or correct the installation condition.

2. CHECK OUTPUT OF PRESSURE SENSOR WITH SUBARU SELECT MONITOR  .

   Using the Subaru Select Monitor, read data of [FL wheel cylinder pressure sensor output], [FR wheel cylinder pressure sensor output] in the [Data Monitor] of [Brake Control]. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DATA MONITOR 

   With the brake pedal released, are the values of [FL wheel cylinder pressure sensor output] and [FR wheel cylinder pressure sensor output] between 0 - 11 bar?

   Yes  : Go to  3.

   No  : Replace the VDC Control Module & H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC CONTROL MODULE & H/U)

3. CHECK OUTPUT OF PRESSURE SENSOR WITH SUBARU SELECT MONITOR  .

   Using the Subaru Select Monitor, read data of [FL wheel cylinder pressure sensor output], [FR wheel cylinder pressure sensor output] in the [Data Monitor] of [Brake Control]. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DATA MONITOR 

   When the brake pedal is operated, do the values of [FL wheel cylinder pressure sensor output] and [FR wheel cylinder pressure sensor output] change in accordance with the brake pedal? In addition, is the difference between [FL wheel cylinder pressure sensor output] and [FR wheel cylinder pressure sensor output] values less than 10 bar?

   Yes  : Go to  4.

   No  : Replace the VDC Control Module & H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC CONTROL MODULE & H/U)

4. CHECK VDC Control Module & H/U  .
   1. Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY
   2. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>INSPECTION MODE 
   3. Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

   Is the same DTC displayed?

   Yes  : Replace the VDC Control Module & H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC CONTROL MODULE & H/U)

   No  : Go to  5.

5. CHECK DETECTION OF OTHER DTCS FOR VDC  .

   Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

   Is any other DTC displayed?

   Yes  : Perform the diagnosis according to the DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST 

   No  : Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.