Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

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
1. Go To step 2).
No
1. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
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
1. Go To step 3).
No
1. Replace the Evap Purge Solenoid.
2. Perform POWERTRAIN VERIFICATION TEST .
  NOTE: Remove the vacuum pump 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
1. Repair the vacuum supply hose/tube as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .