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

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Improper idling
• Poor driving performance

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM (CROSSTREK MODEL)>Engine Electrical System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DATA MONITOR  .
   1. Clear the memory. Ref. to COMMON (diag)>CLEAR MEMORY .

      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].

      Data Monitor 

      NOTE:

      • SUBARU SELECT MONITOR

        For detailed operation procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DATA MONITOR .

      • General scan tool

        For detailed operation procedures, refer to the general scan tool operation manual.

      Is the value of [Fuel Rail Pressure B] 0 kPa (0 kg/cm² , 0 psi) or more?

      Yes:  Go to  2.

      No:  Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

      NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
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 voltage between ECM connector and engine ground.

      Connector & terminal 

      (E158) No. 50 - Chassis ground:

      (E162) No. 1 - Chassis ground:

      Is the resistance 1 MΩ or more?

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

      No:  Repair or replace the wiring harness or connector.