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Home >> Pontiac >> 2004 >> Aztek Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1441: EVAP System Flow During Non-Purge >> Diagnostic Procedures
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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. 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, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  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, see DIAGNOSTIC AIDS . 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 gage to the EVAP purge port. Disconnect the EVAP canister purge valve harness connector. Monitor vacuum on the vacuum gage. Start the engine and allow the engine to idle. Increase the idle to 1200-1500 RPM. Does the vacuum gage indicate an increase in vacuum? If yes, go to step  7. If no, see DIAGNOSTIC AIDS .
  5. Test for an intermittent and/or poor connections 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. See FUEL TANK PRESSURE SENSOR under SENSORS in REMOVAL & INSTALLATION - DEVILLE & SEVILLE article. Did you complete the replacement?
  7. Replace the EVAP canister purge solenoid. Refer to Evaporative Emission (EVAP) Canister Vent Valve Replacement. Did you complete the replacement? If yes, 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. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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