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 arid 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 steps:
^ Turn OFF the [1][2]EVAP purge valve.
^ Following the passed Weak Vacuum Test and while the EVAP vent valve is still turned ON or 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 an excessive decrease in the vacuum that is trapped in the system, a DTC P0442 is set.