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

  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

1. Start the engine.
2. Using the Subaru Select Monitor or a general scan tool, read the value of [Fuel Rail Pressure A].
   NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

Is the value of [Fuel Rail Pressure A] 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 .

1. Turn the ignition switch to OFF.
2. Disconnect the connector of the fuel pressure sensor.
3. Turn the ignition switch to ON.
4. Measure the voltage between fuel pressure sensor connector and engine ground.

   Connector and terminal 

   (E162) No. 4 (+) - Engine ground (-):

Is the voltage 4.5 - 5.5 V?

Yes:  Go to  3.

No:  Go to  5.

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance of harness between ECM connector and fuel pressure sensor connector.

   Connector and terminal 

   (E158) No. 56 - (E162) No. 3:

   (E158) No. 58 - (E162) No. 2:

Is the resistance less than 1 Ω?

Yes:  Go to  4.

No:  Repair the harness and connector.

1. Connect all connectors.
2. Turn the ignition switch to ON.
3. Measure the voltage between ECM connector and fuel pressure sensor connector and engine ground.

   Connector and terminal 

   (E158) No. 56 (+) - Engine ground (-):

   (E162) No. 3 (+) - 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) (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE SENSOR .

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance of harness between ECM connector and fuel pressure sensor connector.

   Connector and terminal 

   (E158) No. 41 - (E162) No. 4:

Is the resistance less than 1 Ω?

Yes:  Go to  6.

No:  Repair the harness and connector.

Measure the resistance between ECM connector and fuel pressure sensor connector and engine ground.

Connector and terminal 

(E158) No. 41 - Engine ground:

(E162) No. 4 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM) .

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