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Home >> Chevrolet >> 2001 >> 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 powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK . After performing powertrain diagnostic system check, go to next step.
  2. If DTCs P0443, P0449, P0452, or P0453 are also set, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If DTCs P0443, P0449, P0452, or P0453 are not also set, go to next step.
  3. Remove fuel fill cap. Turn ignition on, engine off. Using scan tool, monitor FTP. If scan tool indicates FTP is -0.5-0.5 in. H2O, go to next step. If scan tool does not indicate FTP is -0.5-0.5 in. H2O, 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. If gauge indicates an increase in vacuum, go to next step. If gauge does not indicate an increase in vacuum, see DIAGNOSTIC AIDS .
  5. Replace EVAP canister purge valve. After repairs, go to next step.
  6. Using scan tool, monitor fuel tank pressure. Start engine and allow engine to idle for 30 seconds. If scan tool indicates fuel tank pressure is -0.5-0.5 in. H2O, go to next step. If scan tool does not indicate fuel tank pressure is -0.5-0.5 in. H2O, go to step  3.
  7. Using scan tool, observe stored information. If scan tool displays any DTCs that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
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