DTC P0193: Fuel Rail Pressure Sensor Circuit High Bank 1: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Improper idling
• Poor driving performance

• Use the check board when measuring the ECM terminal voltage and resistance.

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK FOR POOR CONTACT  .

   Check for poor contact of ECM and fuel pressure sensor connector.

   Is there poor contact of the ECM or fuel pressure sensor connector?

   Yes: Repair the poor contact of the ECM or fuel pressure sensor connector.

   No: Go to  2.

2. CHECK HARNESS BETWEEN ECM AND FUEL PRESSURE SENSOR CONNECTOR  .
   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 of harness between ECM connector and fuel pressure sensor connector.

      Connector & terminal 

      (E159) No. 27 - (E162) No. 1:

      (E158) No. 6 - (E162) No. 2:

   Is the resistance less than 1 Ω?

   Yes: Go to  3.

   No: Repair the open circuit in harness between ECM connector and fuel pressure sensor connector.

3. CHECK HARNESS BETWEEN ECM AND FUEL PRESSURE SENSOR CONNECTOR  .
   1. Connect all connectors.
   2. Turn the ignition switch to ON.
   3. Measure the voltage between ECM connector and engine ground.

      Connector & terminal 

      (E158) No. 6 (+) - Engine ground (-):

   Is the voltage 5 V or more?

   Yes: Repair the short circuit to power in the harness between ECM connector and fuel pressure sensor connector.

   No: Replace the fuel pressure sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Fuel Pressure Sensor .