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Home >> Pontiac >> 2002 >> Aztek AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1441: EVAP System Flow During Non-Purge >> Diagnostic Procedures
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Diagnostic Procedures

  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Are DTCs P0443, P0449, P0452 or P0453 also set? If yes, see DTC P0443: EVAP PURGE SOLENOID CONTROL CIRCUIT , DTC P0449: EVAP VENT VALVE PERFORMANCE , DTC P0452: FUEL TANK PRESSURE SENSOR - LOW VOLTAGE  or DTC P0453: FUEL TANK PRESSURE SENSOR - HIGH VOLTAGE  . If no, go to next step.
  3. Remove the fuel fill cap. Turn ON the ignition, with the engine OFF. With a scan tool, monitor the FTP. Does the scan tool indicate FTP -0.5-0.5 in. H2O? If yes, go to next step. If no, see DTC P0453: FUEL TANK PRESSURE SENSOR - HIGH VOLTAGE .
  4. Disconnect the EVAP purge pipe from the EVAP canister purge valve. Install a hand held vacuum gauge to the EVAP purge port. Disconnect the EVAP canister purge valve harness connector. Monitor vacuum on the vacuum gauge. Start the engine and allow the engine to idle. Increase the idle to 1200-1500 RPM. Does the vacuum gauge indicate an increase in vacuum? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  5. Replace the EVAP canister purge valve. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
  6. Monitor the fuel tank pressure with a scan tool. Start the engine and allow the engine to idle for 3 seconds. Does the scan tool indicate fuel tank pressure is -0.5-0.5 in. H2O? If yes, go to next step. If no, go to step  3.
  7. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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