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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Controls - Self-Diagnostics - 4.0L) >> 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 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. Are DTCs P0443, P0449, P0452, or P0453 also set? If yes, diagnose DTC(s) before continuing with this test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  3. Remove fuel fill cap. Ensure ignition is on. Using scan tool, monitor fuel tank pressure. Does the scan tool indicate fuel tank pressure within -.5 to +.5 in. H2O? If yes, go to next step. If no, 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. Does the vacuum gauge indicate an increase in vacuum? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  5. Replace EVAP canister purge valve. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
  6. Use the scan tool in order to clear the DTCs. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  3.
  7. With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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