I am pretty sure my MAF sensor is bad, Before I replace it I am trying to check my wiring to MAF and voltage to and fro the MAF. One thing stands out, My burnoff is always hot as in my wire is glowing all the time. My question is how does pin 3 in the MAF sensor get it's charge? Does the signal come from the LH Module or is it hot all the time and switches on and off from the sensor? Just for reference my wiring harness both upper and lower has been replaced with new.