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. 
   1. Select the [Data Monitor] using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DATA MONITOR .
   2. Read [FL Wheel Cylinder Pressure Sensor Output] and [FR Wheel Cylinder Pressure Sensor Output] indicated on the display screen.

   With the brake pedal released, are the values of [FL Wheel Cylinder Pressure Sensor Output] and [FR Wheel Cylinder Pressure Sensor Output] 0 - 11 bar?

   Yes  : Go to  3.

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

3. CHECK OUTPUT OF PRESSURE SENSOR WITH SUBARU SELECT MONITOR. 
   1. Select the [Data Monitor] using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DATA MONITOR .
   2. Read [FL Wheel Cylinder Pressure Sensor Output] and [FR Wheel Cylinder Pressure Sensor Output] indicated on the display screen.

   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 VDCCM & H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) .

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

   Is the same DTC displayed?

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

   No  : Go to  5.

5. CHECK DETECTION OF OTHER DTCS FOR VDC. 

   Read the DTC using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any other DTC displayed?

   Yes  : Perform the diagnosis according to 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.