Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
P0441-EVAP PURGE SYSTEM PERFORMANCE DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Start by reading PCM DTC(s) and record the related Freeze Frame data in any DTC(s) are present. Check the vehicle repair history. If the vehicle has a repair history that pertains to the customer's current complaint, review the repair. Inspect the vehicle for any aftermarket accessories that may have been installed incorrectly. Check for any service bulletin(s) related to the customer's complaint or DTC(s). If a service bulletin applies, follow the instructions per service bulletin. Did the service bulletin repair the customer's complaint? Yes --> Testing Complete. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 2 |
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| 2 |
NOTE:
If any of the following DTCs are set (P0443, P0452, P0453, P0498 or P0499) diagnose them first before continuing with P0441. Ignition on, engine not running.With the DRBIII®, read DTCs and record the related Freeze Frame data.Is the Good Trip Counter displayed and equal to zero?Yes --> Go To 3No --> Refer to the INTERMITTENT CONDITION SYMPTOM .Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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| 3 |
NOTE:
After disconnecting the Evap Purge vacuum connections, inspect the lines and solenoid for any signs of contamination or foreign materials. Using a hand vacuum pump, apply 10 in Hg to "CAN" side of the EVAP Purge Solenoid.Ignition on, engine not running.Observe the vacuum gauge.With the DRBIII®, actuate the EVAP Purge Solenoid.Does the vacuum drop when the solenoid is actuated?Yes --> Go To 4No --> Replace the Evap Purge Solenoid.Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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| 4 | Turn the ignition off. Carefully inspect the Evap Purge Solenoid vacuum supply hose for proper routing. Check for a pinched or plugged hose from the throttle body to the Purge Solenoid. Inspect the vacuum port at the throttle body for any damage or plugging. Were any problems found? Yes --> Repair the vacuum supply hose/tube as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 5 |
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| 5 | Connect the previously disconnected vacuum hoses. Start the engine. Allow the engine to idle. Using the scan tool, perform the NVLD FORCED MONITOR TEST. Monitor the NVLD Switch state.
NOTE:
As the test runs, the NVLD Switch should go from an OPEN to a CLOSED state and then return to OPEN when the test is complete. This may take up to 10 minutes. Did the NVLD Switch operate as described above? Yes --> Test complete. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 6 |
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| 6 | Perform the NVLD FORCED MONITOR TEST for the second time. While the NVLD FORCED MONITOR TEST is running, open/remove the gas cap. Did the NVLD Switch go from OPEN to CLOSED? Yes --> Replace the NVLD Assembly. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No. Test Complete. |
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