Above are the oscilloscope patterns of a MAP sensor against an injector, the bottom line is the injector and the top is the map, as the engine revs the pressure increases in the manifold and and the MAP signal increases. also as the RPM rises the injector pulses become more frequent and the length of time they are grounded for increases. as the revs drop again the MAP voltage drops the injector pulses slow down again and the earth tine becomes very short.
Above is an injector against an O2 sensor, what will happen is as the voltage on the O2 sensor drops the ECU will think that the engine is running lean and will inject more fuel so the time the injector is earthed will be longer. as the voltage on the O2 sensor increases again the ECU will think it's running rich and the injector will be fired for a shorter time.
If it was the ignition primary verses an injector the injector would fire and then the primary would close to collapse it's field across the secondary to create the charge required to jump the air gap of the spark plug. as this engine has grouped injectors they will fire every second stroke(instead of every forth on a non grouped engine) and the primary will fire once every stroke, once for each cylinder.
for ignition current against voltage the current would start high and then slowly decrease as the coil charges then as the power is stopped to collapse the field it will stop. at the same time the voltage will be low while the coil is charging then when the field is collapsed there will be a large voltage spike of back EMF then it will go to the supply voltage until the coil is grounded again.
