P0441

DTC P0441 EVAP EMISSION SYSTEM INCORRECT PURGE FLOW

Component Location:

COMPONENT LOCATION

GENERAL DESCRIPTION
The evaporative emission control system prevents hydrocarbon (HC) vapors from the fuel tank from escaping 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
If the PCSV is open stuck, the PCM determines that a fault exists and a DTC is stored.red.

DTC Detecting Condition:

Schematic Diagram:

MONITOR SCANTOOL DATA
1. Warm-up engine to normal operating temperature.

NOTE: Evaporative Emissions Systems (EVAP) Leak Tests can be run by the Scan Tool.
The tests are automated and provide either a pass-fail result or directions to check for DTCs.




2. Install scan tool and perform "05 EVAP. LEAKAGE TEST" mode referring to enable conditions as above.
3. Monitoring for (pending) DTC by performing "01. DIAGNOSTIC TROUBLE CODES" or "04. MONITORING TEST RESULTS" Is the same DTC set?

YES: Go to "System Inspection" procedure.

NO: Fault is intermittent caused by poor contact in Sensor's and/or PCM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification vehicle Repair" procedure.

COMPONENT INSPECTION
1. Check PCSV
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. Ignition "ON" and ground terminal 2 of the PCSV connector (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. Monitor signal waveform of PCSV with Scantool.
8. Is the PCSV working properly?

YES:
- Substitute with a known - good PCM and check for proper operation.
- If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.

NO:
- Substitute with a known - good PCSV and check for proper operation.
- If the problem is corrected, replace PCSV and 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. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
2. Using a Scantool, Clear the DTCs.
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Monitor that all readiness tests have been verified as " Complete"
5. Are any DTCs present?

YES: Go to the applicable troubleshooting procedure.

NO: System is performing to specification at this time.