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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 P0440: EVAP System - Large Leak Detected >> Test Description

Test Description

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 system is less pressurized, 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 6-7 in. H2O.
  5. 9 -  This step tests the EVAP purge solenoid vacuum source between the EVAP purge solenoid and the intake manifold for restrictions or blockages.

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