Ok, so you have a 1.6 SOHC 8v engine right?
If it is a SX, then it has bosch monopoint injection. That injection works with help of a MAP sensor, which is integrated in a module that is mounted on the
injector thtottle body. Look for injector, and right down beside it there should be a MAP sensor mounted. You can reckognize a MAP because it works on pressure difference, it needs to have a thin tube fitted to it, and that tube must be tied into intake plenum at some point, or the sensor itself is mounted on the plenum. I cannot remember exactly where it is on this engine, but I'll try to dig up the diagrams.
MAF is another type of sensor, mass air flow. It measures changes in fueling of the engine by measuring how much air passes into the engine. This engine is not fitted with a MAF.
Both MAF and MAP in essence control the same thing - fueling. But it is common that N/A engines mostly lean on MAP (pressure difference), while turbo engines rely mostly on MAF (measuring mass of air sucked in). There can be different arrangements, but these are most common.
You do have a MAP on the engine, and if it is it's fault, disconnecting it should give no change in way engine operates. If engine only slightly changes it's operation or none at all upon disconeccting the sensor, you can be pretty sure it's toast.
Hope I had cleared things a bit