[wawa]

Ok, long story not so short, engine run pretty bad or not at all. My mechanic did lots of testing and find out that MAF is fine but the ground was spiking, not constant. He was about to test ground resistance of ground wire and at the output of ECU (pin 9 of connecter 2 I think) but while getting ready for testing, everything got back perfect and engine was running good. He could never confirm if it's a short of ground wire or from the ECU generated ground.

So I had to drive back home, hoping it would never happened again. Well 2months later, it's back. So i need to check ground resistance to confirm it's the same problem again and to determine if it's the ECU ground generated that is wrong or if it's a short at the ground wire from ECU to MAF.

So, how I do that? I know nothing about electronic and electricity. I have a multimeter, what seting I set it? I have to stick the red pointer of the multimeter in the MAF connector at the brown/white wire, were to i put the black pointer? I put the key to ON position? What reading I'm looking for?

See how newbee I am, but I would like to learn. Anyone can help with a walkthrough?

Thanks
Chris