Small EVAP Leak Test

SMALL EVAP LEAK TEST
The Small EVAP Leak Test will run immediately following a passing Weak Vacuum Test. While vacuum is still present in the fuel tank, the vent and purge are both command closed to seal the system. With the system closed, the Control Module monitors the trapped vacuum in the system through the Fuel Tank Pressure Sensor. If the vacuum decay rate is too fast, a small leak is indicated and DTC P0442 is stored. Otherwise DTC P0442 is passed and the Excess Vacuum Test Stage 2 is run.

NOTE: This test may run up to three times prior to reporting a failure. P0442 indicates a small leak anywhere between the fuel fill cap and up to but not including the purge solenoid.