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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Engine Control System - Self-Diagnostics - 4.2L) >> Diagnostic Tests >> DTC P0440: EVAP System - Large Leak >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 4

    This test verifies that the EVAP purge valve can be commanded ON and OFF.

  2. 5

    This test verifies that the EVAP vent valve can be commanded ON and OFF.

  3. 10

    This test verifies that engine vacuum is present when the EVAP purge valve is open.

  4. 12

    This test verifies that the FTP sensor is accurate. An EVAP FTP sensor that does not correctly respond to vacuum, or pressure, may cause this DTC to set.

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