DTC P0088: Fuel Rail/System Pressure - Too High Bank 1: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Poor driving performance
• Poor acceleration

1. CHECK DTC. 

   Read the engine DTC using the Subaru Select Monitor or general scan tool. Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC other than P0088 displayed? (Current malfunction)

   Yes:  Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

   No:  Go to  2.

2. CHECK FUEL PRESSURE. 
   1. Start the engine.
   2. Using Subaru Select Monitor, read the values in «Fuel Rail Pressure A» and «Commanded Fuel Rail Pressure A» until the vehicle is accelerated to 60 km/h (37.3 MPH) from the parked state and stops again.
   CAUTION:

   • Follow traffic rules and give the highest priority to safe driving.
   • During driving, do not operate or gaze at the Subaru Select Monitor.
   • Always check the measurement value after bringing the vehicle to a stop in a safe place.
   NOTE:

   • In order to apply the running load to the vehicle, actually drive the vehicle, and read the measurement value.
   • For detailed operation procedures, refer to "Current Data Display For Engine". Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>SUBARU SELECT MONITOR .

   Is the value in «Fuel Rail Pressure A» synchronized with the one in «Commanded Fuel Rail Pressure A»?

   Yes:  Replace the high-pressure fuel pump. Refer to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>HIGH PRESSURE FUEL PUMP . After replacement, go to the next step. Go to  3.

   No:  Replace the fuel pressure sensor. Refer to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>FUEL PRESSURE SENSOR .

3. CHECK FOR REPRODUCTION OF FAILURE. 
   1. Perform the Clear Memory Mode. Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>CLEAR MEMORY MODE .
   2. Perform appropriate drive cycle test. Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>DRIVE CYCLE .
   3. Read the DTC. Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC P0088 displayed?

   Yes:  Repair the poor contact of ECM connector.

   No:  End.