1.4.1.1 Small Leak Check

P0442 (TESGmax) 

The air pump's motor current is monitored over a calibrated period of time while air is continuously pumped into the tank.

If the motor current exceeds a calibrated threshold value after the calibrated period of time, it implies no small leak (> 0.04 in) is present in the evaporative system.

If the motor current is less than the calibrated threshold value a second confirmation check is performed utilizing a longer measurement so a more reliable result can be obtained.