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. Ref. 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)". Ref. 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". Ref. 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. Ref. 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. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Fuel Pressure Sensor .

3. CHECK FOR REPRODUCTION OF FAILURE  .
   1. Perform the Clear Memory Mode. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Clear Memory Mode .
   2. Perform appropriate drive cycle test. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Drive Cycle .
   3. Read the DTC. Ref. 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.