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  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC other than P0088 displayed? (Current code)

   Yes:  Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   No:  Go to  2.

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

   • 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 "COMMON (DIAGNOSTICS)". Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR .

   Is the value of [Fuel Rail Pressure A] synchronized with that of [Commanded Fuel Rail Pressure A]?

   Yes:  Replace the high-pressure fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>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) (H4DOTC)>FUEL PRESSURE SENSOR .

3. CHECK FOR REPRODUCTION OF FAILURE  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor or a general scan tool, perform the clear memory of [Engine]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
   3. Perform the corresponding inspection mode. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>INSPECTION MODE .
   4. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC P0088 displayed? (Current code)

   Yes:  Repair the poor contact of ECM connector.

   No:  End.