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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 28 (Engine Control System - Self-Diagnostics) >> Diagnostic Tests >> DTC P0441: EVAP System No Flow During Purge >> Test Description
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Test Description

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 4  - This step verifies EVAP canister purge solenoid electrical operation.
  2. 5  - This step tests EVAP canister purge solenoid function.
  3. 8  - This step uses EVAP Purge/Seal function to test EVAP canister vent solenoid, pressure switching solenoid, and purge solenoid for correct operation. Using EVAP Purge/Seal function also tests for leaks by allowing the technician to seal the system and monitor FTP sensor.
  4. 9  - This step tests EVAP canister vent valve and hoses for a blockage or restriction. If vacuum does not drop to less than -10.0 in. H2O after 30 seconds, there is a faulty condition in EVAP vent system. EVAP vent portion of EVAP control system is diagnosed in DTC P0446.
  5. 21  - This step uses EVAP Purge/Seal function to test EVAP canister vent solenoid, pressure switching solenoid, and purge solenoid for correct operation. Using EVAP Purge/Seal function also tests for leaks by allowing the technician to seal the system and monitor FTP sensor.
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