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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 233 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0440: EVAP System - Large Leak Detected >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. 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 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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