DTC Troubleshooting: P04DF
DTC P04DF: EVAP System High Purge Flow Detected
Special Tools Required
?Vacuum Pump/Gauge, 0?30 inHg Snap-on YA4000A or equivalent, commercially available
?Vacuum/Pressure Gauge, 0?4 inHg 07JAZ-001000B
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P04DF EVAP System High Purge Flow Detected
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Select the EVAP TEST in the INSPECTION MENU, then select the FUNCTION TEST with the HDS.
NOTE: If the test could not be completed because of another DTC, do the troubleshooting for that DTC.

  

Is the result OK?

     
YES
     
     
     
Intermittent failure, the system is OK at this time. Check the EVAP canister purge valve for debris that may cause it to stick open intermittently. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
     
NO
     
     
     
The failure is duplicated. Go to step 2.
2.
EVAP canister purge valve open stuck check:

EVAP canister purge valve open stuck check
?1.
Remove the EVAP canister purge valve with its connector and vacuum hose connected.

?2.
Disconnect the vacuum hose (purge line) (A) from the EVAP canister purge valve (B) in the engine compartment, then connect a T-fitting (C), a vacuum gauge, and a vacuum pump/gauge, 0?30 inHg, to the vacuum hose as shown.


?3.
Apply about 2 kPa (0.6 inHg, 15 mmHg) of vacuum to the EVAP canister purge valve.

Does it hold vacuum?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Non-return valve check:

Non-return valve check
?1.
Inspect the non-return valve.

Is the valve OK?

     
YES
     
     
     
     
NO