DTC P04DF (1.5 L Engine)

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 (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Select the EVAP TEST (ELCM) in the INSPECTION MENU, then select EVAP Leak Check Module Test with the HDS.

   NOTE:  If the test could not be completed because of another DTC, do the troubleshooting for that DTC.

   EVAP TEST (ELCM)

   Is the result OK?

   YES 

   If the test result is PASSED, 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

   -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.

   Courtesy of HONDA, U.S.A., INC.

   -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 

   Replace the EVAP canister purge valve .

3. Non-return valve check

   -1. Inspect the non-return valve .

   Is the valve OK?

   YES 

   Replace the EVAP leak check module .

   NO 

   Replace the EVAP canister purge valve .