DTC P04F1: EVAP System Low Pressure Purge Line Performance: Notes

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

Fuel odor

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 P04F1 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 PIPES  .
   1. Turn the ignition switch to OFF.
   2. Check for disconnection or damage in the following pipes. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>GENERAL DESCRIPTION>COMPONENT .
      • Between leak check valve assembly and purge control solenoid valve
      • Between purge control solenoid valve and check valve 1
      • Between check valve 2 and intake manifold

   Is the check result OK?

   Yes:  Go to  3.

   No:  Repair or replace faulty parts. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>LEAK CHECK VALVE ASSEMBLY . Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>CHECK VALVE .

3. CHECK PURGE CONTROL SOLENOID VALVE  .

   Check that the purge control solenoid valve has no open or close stuck. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>PURGE CONTROL SOLENOID VALVE>INSPECTION .

   Is the check result OK?

   Yes:  Go to  4.

   No:  Replace the purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>PURGE CONTROL SOLENOID VALVE .

4. CHECK CHECK VALVE  .

   Check the check valve 1 for close stuck. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>CHECK VALVE>INSPECTION .

   Is the check result OK?

   Yes:  Go to  5.

   No:  Replace the check valve 1. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>CHECK VALVE>REMOVAL .

5. CHECK CPC PRESSURE SENSOR  .

   Check the CPC pressure sensor. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>CPC PRESSURE SENSOR>INSPECTION .

   Is the check result OK?

   Yes:  End.

   No:  Replace the CPC pressure sensor. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>CPC PRESSURE SENSOR .