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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> DTC P1441: EVAP Emission System Flow During Non-Purge >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. If DTC P0443, P0449, P0452 or P0453 is also set, diagnose DTC(s) before continuing with this test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If DTC P0443, P0449, P0452 or P0453 is not also set, go to next step.
  3. Remove fuel fill cap. Ensure ignition is on. Using scan tool, monitor fuel tank pressure. If fuel tank pressure is -.5 to +.5 in. H2O, go to next step. If fuel tank pressure is not -.5 to +.5 in. H2O, go to DTC P0453: FUEL TANK PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE .
  4. Disconnect EVAP purge pipe from EVAP canister purge valve. Install a vacuum gauge to EVAP canister purge valve purge port. Disconnect EVAP canister purge valve connector. Monitor vacuum on vacuum gauge. Start engine and allow it to idle. Increase engine speed 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. With scan tool, capture and record the Fail Record data and clear the DTCs. Perform the Service Bay Test using scan tool. Does 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, check for any other DTCs that are set. If no other DTCs are set, system is okay. If any other DTCs are set, repair DTCs as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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