Test Description

WARNING: This page is about a different car, the 2002 Pontiac Sunfire, 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The number below refer to the step number on the diagnostic procedure.

4

This test verifies that the EVAP purge valve is electrically functional.

5

This test verifies that the EVAP vent valve is electrically functional.

10

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

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.