DTC P04F0 (1.5 L Engine)

DTC P04F0  : EVAP System Incorrect 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 Purge Flow Check Test with the HDS.

   EVAP TEST (ELCM)

   Is DTC P04F0 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EVAP leak check module, the EVAP canister purge valve, and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

2. Purge tube B visual check

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Check for poor connection, blockage, or damage at purge tube B between the EVAP canister purge nozzle and the EVAP canister purge valve.

   Is the line OK?

   YES 

   Go to step 3.

   NO 

   Reconnect or repair purge tube B.

3. Purge tube D visual check

   -1. Check for poor connection, blockage, or damage at purge tube D between the EVAP canister purge nozzle and intake air duct E.

   Is the hose OK?

   YES 

   Go to step 4.

   NO 

   Reconnect or replace purge tube D.

4. Determine possible failure area (EVAP canister purge line, others)

   -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).

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

   -3. Disconnect the EVAP canister purge line (A) from the EVAP canister (B). Connect the T-fitting (C), the vacuum gauge, and the vacuum pump/gauge, 0-30 inHg to the EVAP canister purge line as shown.

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

   -4. Slow apply about 2 kPa (0.6 inHg, 15 mmHg) of vacuum to the hose.

   Does the hose hold vacuum?

   YES 

   Check for blockage in the EVAP canister purge line between the EVAP canister purge valve and the EVAP canister.

   NO 

   Go to step 5.

5. Purge tube D check

   -1. Disconnect purge tube D from intake air duct E, and connect the vacuum pump/gauge, to purge tube D as shown.

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

   -2. Apply vacuum to the hose.

   Does it hold vacuum?

   YES 

   Check for blockage at purge tube D between intake air duct E and the EVAP canister purge nozzle.

   NO 

   Go to step 6.

6. Intake air duct port check

   -1. Check for debris or clogging at the port (A) of intake air duct E.

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

   Is the port OK?

   YES 

   Go to step 7.

   NO 

   Clean intake air duct E port, or replace intake air duct E if needed .

7. Purge tube B check

   -1. Disconnect purge tube B from the EVAP canister purge nozzle (A), and connect the vacuum pump/gauge, to the hose as shown.

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

   -2. Select the EVAP TEST (ELCM) in the INSPECTION MENU, then select PCS ON in the Single Solenoid Test with the HDS.

   EVAP TEST (ELCM)

   Apply vacuum to the tube.

   Does it hold vacuum?

   YES 

   Check for blockage at purge tube B line between the EVAP canister purge nozzle and the EVAP canister purge valve.

   NO 

   Go to step 8.

8. Non-return valve B check

   -1. Inspect non-return valve B .

   Is the valve OK?

   YES 

   Check for debris or clogging at the EVAP canister purge nozzle port and intake air duct E port. If needed, replace the EVAP canister purge valve .

   NO 

   Replace the EVAP canister purge valve .