P0441

DTC PO441 EVAP. EMISSION SYSTEM INCORRECT PURGE FLOW

GENERAL DESCRIPTION
The evaporative emission control system prevents hydrocarbon (HC) vapors from the fuel tank escape into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. The PCM controls the Purge Control Solenoid Valve (PCSV) to purge any collected vapors from the canister back to the engine for combustion. This valve is actuated by the purge control signal from the PCM and controls fuel vapor flow from the canister to the intake manifold.

DTC DESCRIPTION
Checking output signals from fuel tank pressure sensor under evap. system test, if fuel task's vacuum is higher than prescribed threshold, PCM sets P0441.

DTC Detecting Condition:

MONITOR SCANTOOL DATA

NOTE: Evaporative Emissions Systems (EVAP) Leak Tests can be run by the Scan Tool.

1. Install scan tool and IG "ON" and then clear DTC.
2. Select and press "EVAP.LEAKAGE TEST" mode in the scan tool.
3. Check if the vehicle is under test conditions as below [Fig 1].







4. If OK, Start engine and restart Evap. Leakage Test again[Fig 2].
5. Is the same DTC set after the Evap. leakage test with scan tool?

YES - Go to "Component Inspection" procedure.

NO - Fault is intermittent, go to "Verification of vehicle Repair" procedure.

COMPONENT INSPECTION
1. Check PCSV for leakage
1. Ignition "OFF"
2. Disconnect the hose leading from the PCSV to the intake manifold at PCSV.
3. Apply a vacuum at the nipple and verify that the PCSV holds vacuum.
4. IG "ON" and perform ACTUATION TEST for PCSV with Scantool(should hear a faint click from PCSV)
5. Vacuum should be released.
6. Repeat this procedure 4 or 5 times to ensure PCSV reliability.
7. Is the PCSV working properly?

YES - It was intermittent failure., go to "Verification of Vehicle Repair" procedure

NO
- Substitute with a known - good PCSV and check for proper operation.
- If the problem is corrected, go to "Verification of Vehicle Repair" procedure

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect Scantool and select "DTC" button.
2. Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed",if not drive the vehicle within conditions noted in the freeze frame data or enable conditions
3. Read "DTC Status" parameter
4. Is parameter displayed "History(Not Present) fault"?

YES - System performing to specification at this time. Clear the DTC

NO - Go to the applicable troubleshooting procedure.