DTC Troubleshooting: P0496
DTC P0496: 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, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0496 EVAP System High Purge Flow Detected
      

1.
Problem verification:

Problem verification
?1.
Press the engine start/stop button to select 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.?
     
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.
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.


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

Does it hold vacuum?

     
YES
     
     
     
     
NO
     
     
     
Repair verification:

?1.
Press the engine start/stop button to select the ON mode.

?2.
Reset the PCM with the HDS.


?3.
Do the PCM idle learn procedure.

?4.
Select the EVAP TEST in the INSPECTION MENU, then select the FUNCTION TEST with the HDS.

  

Is the result OK?

     
YES
     
     
     
Troubleshooting is complete.?
     
NO
     
     
     
Check for poor connections or loose terminals at the FTP sensor, the EVAP canister purge valve, the EVAP canister vent shut valve, and the PCM, then go to step 1.