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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Engine Controls Self-Diagnostics - 5.0L & 5.7L) >> Diagnostic Tests >> DTC P1441: EVAP System Flow During Non-Purge >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  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 DTC P0443: EVAP PURGE SOLENOID CONTROL CIRCUIT , DTC P0449: EVAP VENT SOLENOID CONTROL CIRCUIT , DTC P0452: FUEL TANK PRESSURE SENSOR - LOW VOLTAGE  or DTC P0453: FUEL TANK PRESSURE SENSOR - HIGH VOLTAGE  . 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 Fuel Tank Pressure (FTP) sensor. If scan tool indicates fuel tank pressure within -0.5-0.5 in. H2O, go to next step. If scan tool does not indicate fuel tank pressure within -0.5-0.5 in. H2O, see DTC P0453: FUEL TANK PRESSURE SENSOR - HIGH VOLTAGE .
  4. Disconnect purge pipe from EVAP canister purge valve. See COMPONENT LOCATIONS . Install a hand held vacuum gauge to EVAP purge port. Disconnect EVAP canister purge valve connector. Monitor vacuum on vacuum gauge. Start engine and allow engine to idle. Increase idle 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. Replace EVAP canister purge valve. After repairs, go to next step.
  6. Using scan tool, record FREEZE FRAME/FAILURE RECORDS data. Using scan tool, clear DTCs. Using scan tool, perform SERVICE BAY TEST. If scan tool indicates SERVICE BAY TEST has passed, go to next step. If scan tool indicates SERVICE BAY TEST did not pass, 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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