luvmy88

I'm working on 88 with 98K miles. I've been having problems with it running rough and erratic. I'm thinking it might be the ECM but wanted to check it first.
I did a voltage drop test checking the 5 grounds on the ECM connector with the key turned on. From what I can tell they are A12, D1, D3, D6, and D10
My multimeter is a relatively cheap one with multiple DC voltage settings.
My question is
with the dial set on 200m the 5 pins check 1.2, 1.4, 1.0, 1.0, 1.0 , is that good? With the multimeter set on 2000m the readings are 0.
I'm not comfortable using a multimeter and don't really know what it's telling me.
Are the above numbers volts. Meaning those grounds are loosing 1.4 volts? If so, that seems to be a lot... right?

Thanks to all in advance

65Z01

I don't understand what the "200m" means.

To setup your VM test the voltage across the battery terminals, which should read ~12Vdc, so you will know you are in the proper range.

luvmy88

Yes, thank you. After I ask the question here, I thought it would be better asked in the performance section. Sorry