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Home >> Chevrolet >> 2003 >> Venture Base, Van Cargo Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1441: EVAP System Flow During Non-Purge >> Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Observe the Freeze Frame/Failure Records for this DTC. Using scan tool, perform the Service Bay Test. Does the scan tool indicate that the Service Bay Test passed? If yes, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 3.4L MONTANA, SILHOUETTE & VENTURE article. If no, go to next step.
  3. Turn ignition off. Disconnect the purge line from the EVAP purge solenoid. Turn ignition on, with engine off. Is the Fuel Tank Pressure Sensor parameter within -1 to 1 in. H2O? If yes, go to next step. If no, go to step  5.
  4. Install 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 engine and allow engine to idle. Increase engine speed to 1200-1500 RPM. Does the vacuum gauge indicate an increase in vacuum? If yes, go to step  7. If no, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 3.4L MONTANA, SILHOUETTE & VENTURE article.
  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 FTP sensor. After repairs, go to step  8.
  7. Replace EVAP canister purge valve. See REMOVAL & INSTALLATION - MONTANA, SILHOUETTE & VENTURE article. After repairs, go to next step.
  8. Perform the Service Bay Test. Does the scan tool indicate that the Service Bay Test passed? If yes, go to next step. If no, go to step  3.
  9. Observe the stored information, Capture Info with a scan tool. 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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