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. (Models with EyeSight)

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 Subaru Select Monitor, display [FL wheel cylinder pressure sensor output] and [FR wheel cylinder pressure sensor output] of [Data Monitor]. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DATA MONITOR .

   With the brake pedal released, is the value of [FL wheel cylinder pressure sensor output] and [FR wheel cylinder pressure sensor output] 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 Subaru Select Monitor, display [FL wheel cylinder pressure sensor output] and [FR wheel cylinder pressure sensor output] of [Data Monitor]. 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. 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 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 using 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.