Small EVAP Leak Test

The control module performs the Small [1][2]EVAP Leak Test in order to detect a small leak in the following components of the EVAP system:
^ The fuel tank
^ The fuel filler cap
^ The fuel filler neck
^ The EVAP canister
^ The EVAP vent valve
^ The [1][2]EVAP vapor pipes and hoses

The Small [1][2]EVAP Leak Test does not test the EVAP purge solenoid for leaks.

In order to run the Small [1][2]EVAP Leak Test the control module performs the following:
^ Turn OFF the [1][2]EVAP purge valve (closed)
^ Following the passed Weak Vacuum Test and while the EVAP vent valve is still turned ON (closed), run the Small [1][2]EVAP Leak Test.
^ Monitor the fuel tank pressure sensor signal.

The control module monitors the vacuum trapped in the system. If the control module detects a excessive decrease in the vacuum that is trapped in the system a DTC P0442 is set.