p1141

[LACLUV]

hey fellas got a 2001 sedan deville keep getting p1441 code any ideas on what code cause it. went to take emission found code active test states imcomplete monitors are AIR, CATALYST.

[Bruce Nunnally]

This DTC tests for undesired intake manifold vacuum flow to the evaporative emission (EVAP) system. The control module seals the EVAP system by commanding the EVAP canister purge valve Closed and the EVAP canister vent valve Closed. The control module monitors the fuel tank pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system. If vacuum in the EVAP system is more than a predetermined value within a predetermined time, this DTC sets.

Diagnostic Aids

An intermittent condition could be caused by an improperly installed or damaged EVAP canister purge valve or by a temporary blockage in the EVAP canister purge valve. In order to repair a blockage in the EVAP system, refer to Evaporative Emission (EVAP) System Cleaning .

Do not perform this procedure unless instructed by an EVAP diagnostic.

1. Turn OFF the ignition.

2. Remove the evaporative emission (EVAP) canister purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Valve Replacement .

3. Lightly tap the EVAP canister purge valve on a clean hard surface.

4. Inspect for carbon particles exiting either of the vacuum ports.

* If no carbon particles are found reinstall the EVAP canister purge valve and continue with the EVAP cleaning procedure.

* If carbon particles are found during the inspection procedure, replace the EVAP canister purge valve and continue with the EVAP cleaning procedure. Refer to Evaporative Emission (EVAP) Canister Purge Valve Replacement .

* If you were instructed to replace the EVAP canister purge valve, and no carbon particles are found, return to the EVAP diagnostic procedure. Do not perform the EVAP cleaning procedure.

Cleaning Procedure

1. Remove the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .

2. Turn OFF the main valve on the J 41413 .

3. Disconnect the hose from the diagnostic station pressure regulator.

4. Using a section of vacuum hose, connect one end to the diagnostic station pressure regulator.

5. Connect the other end of the vacuum hose to the canister side of the EVAP purge pipe.

6. Turn on the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.

7. If the EVAP purge pipe is plugged and the nitrogen does not dislodge the carbon particles, replace the EVAP purge pipe. Refer to Evaporative Emission (EVAP) Hoses/Pipes Replacement - Canister/Fuel Tank .

8. Return the EVAP Pressure/Purge Diagnostic Station to its original condition.

9. Install a new EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .

10. Lower the vehicle.

11. Continue with the published service manual diagnostic DTC procedure.

There is a diagnostic table in the Shop Manual that addresses this DTC.

If you are not getting some related DTCs then the table seems to point to: Replace the EVAP canister purge valve