LEMON Manuals: Even more car manuals for everyone
Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 384 (Engine Controls And Fuel - 5.3L, 6.0L & 6.2L - Description And Operation) >> Description and Operation >> Evaporative Emission Control System Description >> Purge Solenoid Valve Leak Test

Purge Solenoid Valve Leak Test

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Cadillac Escalade EXT. However, it is still accessible from the selected car via links, so may be relevant.

If the EVAP purge solenoid valve does not seal properly fuel vapors could enter the engine at an undesired time, causing driveability concerns. The ECM tests for this by commanding the EVAP purge solenoid valve OFF and the vent solenoid valve ON which seals the system. With the engine running, the ECM then monitors the fuel tank pressure (FTP) sensor for an increase in vacuum. The ECM will log a fault if a vacuum develops in the tank under these test conditions.

scientia non olet · About LEMON Manuals