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

WARNING: This page is about a different variant/trim than selected.

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DTC detecting condition:

Immediately at fault recognition

Trouble symptom:
- Poor driving performance
- Poor acceleration
NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Courtesy of SUBARU OF AMERICA, INC.

CHECK DTC .
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 (HEV))>DIAGNOSTIC TROUBLE CODE (DTC) .

No : Go to 2.
CHECK FUEL PRESSURE .
1. Turn to READY ON.
2. Press the hybrid mode switch to switch to the hybrid battery save mode.
  NOTE:
  Even if switched to the hybrid battery save mode under the following conditions, the engine may not start.
  - Power from HV battery is low and reduction in SOC is slight.
  - SOC is recovering due to regeneration, etc.
3. Using Subaru Select Monitor, read the value 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.
  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 "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 (HEV))>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 (HEV))>FUEL PRESSURE SENSOR .
CHECK FOR REPRODUCTION OF FAILURE .
1. Using the Subaru Select Monitor or a general scan tool, perform the clear memory of [Engine]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
2. Perform the corresponding inspection mode. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>INSPECTION MODE .
3. 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.