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
  CAUTION: After servicing or replacing faulty parts, perform Clear Memory Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Clear Memory Mode>OPERATION . and Inspection Mode Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Inspection Mode>PROCEDURE .

1. CHECK FOR ANY OTHER DTC ON DISPLAY. 

   Is any other DTC displayed?

   • Yes  : Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>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 fuel pressure and the value of [Target Fuel pressure gauge] while the vehicle is accelerated from the parked state to 60 km/h (37.3 MPH) and stops.
      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 procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor .

   Is the value of fuel pressure synchronized with that of [Target Fuel pressure gauge]?

   • 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. Clear the memory. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Clear Memory Mode .
   2. Perform appropriate drive cycle test. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Drive Cycle .
   3. Read the DTC. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Read Diagnostic Trouble Code (DTC) .

   Is the same DTC as current diagnosis output?

   • Yes  : Repair the poor contact of ECM connector.
   • No  : End.