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

1. - 

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 (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC other than P0088 displayed? (Current malfunction)

   Yes  : Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)" Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC TROUBLE CODE (DTC) .

   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 (DIAG)>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) (H4DO)>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) (H4DO)>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 (DIAG)>CLEAR MEMORY .
   3. Perform the corresponding inspection mode. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>INSPECTION MODE .
   4. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC P0088 displayed? (Current malfunction)

   Yes  : Repair the poor contact of ECM connector.

   No  : End.