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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 378 (Engine Controls Self-Diagnostics - 3.1L Engine) >> Diagnostic Tests >> DTC P1441: Evaporative Emission System Flow During Non-Purge >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Observe the Freeze Frame/Failure Records for this DTC. Perform the Service Bay Test. See SERVICE BAY TEST  under DRIVE CYCLES. Does the scan tool indicate that the service bay test passed? If yes, go to step  8. If no, go to next step.
  3. Turn ignition switch to OFF position. Disconnect the purge line from the EVAP purge solenoid. Turn ignition switch to RUN position, engine OFF. Is the FTP sensor parameter -1 to 1 in. H2O? If yes, go to next step. If no, go to step  5.
  4. Connect a hand held vacuum gauge to the EVAP purge port. Disconnect the EVAP canister purge valve harness connector. Monitor vacuum on the vacuum gauge. Start the engine and allow the engine to idle. Increase the idle to 1200-1500 RPM. Does the vacuum gauge indicate an increase in vacuum? If yes, go to step  7. If no, go to DIAGNOSTIC AIDS .
  5. Test for an intermittent and for a poor connection at the FTP sensor. Did you find and correct the condition? If yes, go to step  8. If no, go to next step.
  6. Replace the FTP sensor. After repair, go to step  8.
  7. Replace the EVAP canister purge solenoid. After repair, go to next step.
  8. Perform the Service Bay Test. See SERVICE BAY TEST  under DRIVE CYCLES. Does the scan tool indicate that the service bay test passed? If yes, go to next step. If no, go to step  3.
  9. Using the scan tool, observe the stored information in 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 at this time.
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