DTC P1192: Fuel Rail Pressure Sensor "B" Circuit Low: Notes

1. - 

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Improper idling
• Poor driving performance

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM (IMPREZA MODEL)>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

• IMPREZA MODEL

Courtesy of SUBARU OF AMERICA, INC.

• CROSSTREK MODEL

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DATA MONITOR  .
   1. Using the Subaru Select Monitor or a general scan tool, perform the clear memory of [Engine]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   2. Turn the ignition to OFF.
   3. Start the engine.
   4. Using the Subaru Select Monitor or a general scan tool, read the value of [Fuel Rail Pressure B].
   NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

   Is the value of [Fuel Rail Pressure B] 25000 kPa (3625 psi) or more?

   Yes:  Go to  2.

   No:  Refer to "Check non-permanent occurrence malfunctions". Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0 (EXCEPT FOR HEV))>GENERAL DESCRIPTION>INSPECTION>CHECK NON-PERMANENT OCCURRENCE MALFUNCTIONS .

2. CHECK HARNESS BETWEEN ECM AND FUEL PRESSURE SENSOR CONNECTOR (SHORT TO GROUND)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from ECM.
   3. Disconnect the connector from the fuel pressure sensor.
   4. Measure the resistance between ECM connector and fuel pressure sensor connector and engine ground.

   Connector and terminal 

   (E158) No. 50 - Engine ground:

   (E162) No. 1 - Engine ground:

   Is the resistance 1 MΩ or more?

   Yes:  Replace the fuel pressure sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE SENSOR .

   No:  Repair the ground short circuit of harness between ECM connector and fuel pressure sensor connector.