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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1441: Evaporative Emission System Vacuum Is Greater Than Predetermined Value ("A" & "B" Series) >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
  2. Using scan tool, recheck DTCs. If DTCs P0443, P0449, P0452 or P0453 is also set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If DTCS P0443, P0449, P0452 or P0453 is not set, go to next step.
  3. Turn ignition off. Remove fuel fill cap. Turn ignition on, with engine off. Using scan tool, monitor FTP sensor. If scan tool indicates FTP sensor is within -0.5 to 0.5 in. H2O, go to next step. If scan tool does not indicate that FTP sensor is within -0.5 to 0.5 in. H2O, go to DTC P0453 .
  4. Turn ignition off. Disconnect purge pipe from EVAP canister purge valve. Install a hand-held vacuum gauge to EVAP canister purge valve purge port. Disconnect EVAP canister purge valve harness connector. Monitor vacuum on vacuum gage. Start and operate engine at idle. Increase engine speed to 1200-1500 RPM. If vacuum gauge indicates an increase in vacuum, go to next step. If vacuum gauge does not indicate an increase in vacuum, see DIAGNOSTIC AIDS .
  5. Turn ignition on, with engine off. Using scan tool, review and record FREEZE FRAME/FAILURE RECORDS data and clear DTCs. Using scan tool, perform Service Bay Test. If scan tool indicates that service bay test passed, go to next step. If service bay test does not pass, go to step  3.
  6. Using a scan tool, observe stored information and CAPTURE INFO. If scan tool displays any undiagnosed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
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