P0441

SYMPTOM
P0441-EVAP PURGE SYSTEM PERFORMANCE

WHEN MONITORED
Cold start test. Engine Running. Small Leak Test Passed.

SET CONDITION
The PCM activates the EVAP Purge solenoid gradually increases to maximum flow. During flow, the PCM looks for the NVLD switch to close. If the PCM does not see the NVLD switch close at maximum flow an error is detected. Two Trip Fault. Three good trips to turn off the MIL.

POSSIBLE CAUSES
- EVAP PURGE SOLENOID VACUUM SUPPLY
- EVAP PURGE SOLENOID

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Scan Tool Testing and Procedures

DIAGNOSTIC TEST
1. ACTIVE DTC





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 a scan tool, read DTCs.
Is the DTC active at this time?
Yes>> Go To 2
No>> Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5. Powertrain Verification Test - Ver 5

2. CHECKING EVAP PURGE SOLENOID FUNCTIONALITY





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 scan tool, actuate the EVAP Purge Solenoid.
Does the vacuum drop when the solenoid is actuated?
Yes>> Go To 3
No>> Replace the EVAP Purge Solenoid. Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5.

Note: Remove the vacuum gauge before continuing.

3. EVAP VACUUM SUPPLY HOSE INSPECTION
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 (NGC) POWERTRAIN VERIFICATION TEST VER-5.
No>> Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5.