Eamonn You should get 5v from the ecu with ignition on to pin 4 of the maf (light blue wire).pin 2 of maf (red wire) is your feed in 11v-14v.pin 3 of maf (white wire) is ecu earth ign on no volts, test this pin to earth should see zero Ohms. pin 5 (light blue and black) is your signal to ecu at idle 1.4v, 3000rpm 2v. is this the readings you are getting Regards darren