To test the maf during idle ground the - probe of your meter then with the maf plugged in contact the + probe to the white wire with black stripe, this should be 12v. If your getting 12v power to the maf then move the probe to the other white wire(this will be the other outside wire as the two center wires are grounds) this is the signal wire and you should see .5-1.8ish volts at idle. If you have no signal voltage check the two grounds for continuity, if they check out your maf might be dead. Good luck I just had this happen to my n62 maf....it sucks