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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 362 (Engine Controls Self-Diagnostics) >> Diagnostic Tests >> DTC P0440: EVAP System - Large Leak >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. 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. 2 -  This step verifies that a failure condition is active.
  2. 4 -  Introducing smoke in 15 second intervals may allow smaller leak areas to be more noticeable. When the system is less pressurized, the smoke will sometimes escape in a more condensed manner.
  3. 6 -  This step verifies proper operation of the Fuel Tank Pressure (FTP) sensor.
  4. 7 -  A normal operating FTP sensor should increase to more than 5 in. H2O and stop between 6 in. H2O and 7 in. H2O. This step verifies proper operation of the FTP sensor.
  5. 9 -  This step tests the EVAP purge solenoid vacuum source between the EVAP purge solenoid and intake manifold for restrictions or blockages.

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