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Home >> Chevrolet >> 2002 >> Impala LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P1441: EVAP System Flow During Non-Purge >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS . After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Are DTCs P0443, P0449, P0452, or P0453 also set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  3. Remove fuel fill cap. Turn ignition on, engine off. Using scan tool, monitor FTP. Does the scan tool indicate FTP is -0.5-0.5 in. H2O? If yes, go to next step. If no, see DTC P0453: FUEL TANK PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE .
  4. Disconnect EVAP purge pipe from EVAP canister purge valve. Install a hand held vacuum gauge to EVAP purge port. Disconnect EVAP canister purge valve harness connector. Monitor vacuum on vacuum gauge. Start engine and allow engine to idle. Increase idle to 1200-1500 RPM. Does the gauge indicate an increase in vacuum? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  5. Replace EVAP canister purge valve. After repairs, go to next step.
  6. With a scan tool, capture and record the fail record data and clear the DTCs. Perform the Service Bay Test using scan tool. Does the scan tool indicate that the service bay test passed? If yes, go to next step. If no, go to step  3.
  7. Using scan tool, observe stored information. Does scan tool displays any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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