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

1. - 

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]. Refer to COMMON (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC other than P04F1 displayed? (Current malfunction)

      Yes  : Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Refer 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. Refer 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 No. 1
      • Between check valve No. 2 and intake manifold

      Is the check result OK?

      Yes  : Go to  3.

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

   Is the check result OK?

   Yes  : Go to  4.

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

4. CHECK CHECK VALVE  .

   Check the check valve No. 1 for close stuck. Refer to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>CHECK VALVE .

   Is the check result OK?

   Yes  : Go to  5.

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

5. CHECK CPC PRESSURE SENSOR  .

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

   Is the check result OK?

   Yes  : End.

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