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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1441 - EVAP Emissions System Flow During Non-Purge >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. If DTC P1676 is also set, diagnose DTC P1676 first. If DTC P1676 is not set, go to next step.
  3. Turn ignition off. Remove fuel cap. Turn ignition on. Using scan tool, read FUEL TANK PRESSURE. If scan tool displays zero in. H2O go to next step. If scan tool does not display zero in. H2O, repair faulty fuel tank pressure sensor circuit.
  4. Zero pressure and vacuum gauges on EVAP Pressure/Purge Diagnostic Station (J-41413). Reinstall fuel cap. Read and record FAIL RECORDS data for DTC P1441. Clear DTCs. Connect EVAP pressure/purge diagnostic station to EVAP service port. Using scan tool, command EVAP vent solenoid ON (closed). Using EVAP pressure/purge diagnostic station, attempt to pressurize EVAP system to 5 in. H2O. If specified pressure is achieved, go to next step. If specified pressure is not achieved, to step 6).
  5. Maintain EVAP system pressure at 5 in. H2O. Using scan tool, read FUEL TANK PRESSURE. If scan tool displays 5 in. H2O, go to next step. If scan tool does not display 5 in. H2O, repair faulty fuel tank pressure sensor circuit.
  6. Check EVAP purge vacuum and source line routing and connections at EVAP purge solenoid. If no problem is found, go to next step. If a problem is found, go to step 9).
  7. Disconnect engine vacuum source line from EVAP purge solenoid. Connect a hand vacuum pump to engine vacuum side of EVAP purge solenoid. Attempt to apply 15 in. Hg vacuum to EVAP canister. If vacuum is maintained as specified, see DIAGNOSTIC AIDS. If vacuum cannot be maintained as specified, go to next step.
  8. Replace EVAP purge solenoid. After replacing EVAP purge solenoid, go to step 10).
  9. Correct line routing and connections as necessary. After repairs, go to next step.
  10. Turn engine on. Remove fuel cap. Using scan tool OUTPUT TESTS function. Select and activate SEAL SYSTEM. Reinstall fuel cap. Run engine at 2500 RPM for 10 seconds while monitoring FUEL TANK PRESSURE on scan tool. If scan tool displays zero in. H2O, repair is complete. If scan tool does not display zero in. H2O, return to step 3).
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