Most '96 and later OBDII vehicles they simply go into the PCM during inspection and it will tell if anything has been out of kilter as far as emissions. Basically having a CEL tells them there is a problem there, simply having that light on is a fail inspect here.

Yours probably a HC converter only as the air injection has extra plumbing if the cat is a TWC, the air is then switched from upper at ports to the MIDDLE of the cat at full warm engine since the forward section is NOx and does NOT like extra air but the rear HC section does want it to burn better. Middle of cat then has a open air chamber for injection.

Passive pulse air injection uses no pump, it works due to the normally present exhaust pulsation in all engines, fours have them fairly strong and spaced well and they can be used to zoop air into the exhaust stream. Every exhaust positive pulse out is followed by a negative vacuum pulse, what headers use to increase power, the vacuum pulls more intake mixture into cylinder at overlap period. Using those pulses for air injection requires using one way check valves (usually reeds) that have lower values than normal smog pump ones, they must work with very light pressures. The ones off say Tempos '88-'94 work well for that, they are the low pressure ones being they used pulse air with no pump. Since no true pumping going on there they can often use two valves rather than one to increase air volume.