Interesting.... I asked him 8 months ago what the voltage was across the connector..... and here we are back with the same old question.... Why do people ask a question, get a response, and then ignore it for 8 months?

 

Injuneer, I did not ignore it. I since then took out my engine due a blown head gasket, and I also installed new lifters and reset my valvetrain geometry.

I am about to receive all my tuning and datalogging software soon, but I want to start out right, (good ECM) before I start messing with ECM parameters.

Going back to the IAT, with the ignition on I got (-5) volts across the terminals. Why is the # negative?

 

because you have the probes backwards. you have the red probe on the ground ckt, and the black one on the pos. ckt. that should be the only way that can happen.

 

Damn! Told you I sucked at electronics!

thanks a lot, I will retest soon.

 

Update:

Got my probes straight now.

Across the tan and black wire terminal it read 5volts as mentioned. (no negative #'s this time). This was with ignition key on "on" position.

With the ECM disconnected and no power. I disconnected each harness to isolate the tan and black wire.

I read .9 ohms on both the tan and black wire individually. What is this telling me? You guys stated that it should be .3ohms or less. Are these wire shorted?

Thanks for your input and patience.

 

two things to consider here, one, make sure when your probeing the wire, that you are not touching the probes/wires w/your fingers. this will add resistance. second, touch the two probes together first, and see what it reads. it should read 0, but more then likely you will have a reading of .3 or so ohms. what this means is, your probes have a certain amount of resistance through them. you need to figure out what that amount is, then subtract that from the reading of through the wire your testing. do you know what Im saying? if your meter reads 0 through it like mentioned above, and you were not touching the wires/probes w/your skin, and it still reads .9, that means there is a slight bit of high resistance through the wires them selves. as in there might be some corrosion somewhere in the wires/connectors, or there may be a breakage of the wires inside the wire covers somewhere. as in the metal strands being broken even though you cannot see it being broken. w/the conn.s unplugged still, put one probe on the tan wire, and the other probe on the black wire. you should read OL. if you get an ohms reading, the wires are shorted together somewhere. also, take ea. wire one at a time, and conn. one probe to the wire, and the other probe to the ground side of the batt.. you should read OL for both.