[runner4053]

Originally Posted by jwetzler

I have a 91 Stealth TT and just got the MAFT-Pro. I am going to be running this in Speed Density Mode. I am using the Speed Density Plug and Play Harness. If I understand correctly, the PnP harness lets me plug the readings from the IAT & MAP directly to the MAFT-Pro.
Eliminating the need to use the factory MAF Wiring for SD right?

I need some clarification on how to wire the 10 pin connector to my ECU wiring harness.

I don't currently have a Wideband, so is it fine if I just leave the wires for that unhooked?
Where does the MAF Sig Input come from? And do I even need to worry about that since I am using the Speed Density Plug and play harness?

I looked at the Wiring Diagram on the first page, but wasn't sure what these two wires correspond to:
White Wire=???
Grey Wire =???

Here are the color wires that I have on the 10 PIN Connector, if there are any errors please correct me.

Black=Ground/ pin 26
Yellow=MAF Sig Input
White=?
Grey=?
Brown=Air Temp Output/ pin 52

Orange=Wide Band Input
Purple=Wide Band Ground
Blue=TPS/ pin 65
Dark Green=MAF Sig Output/ pin 70
Pink=+12V/ pin 25

Thanks for all of the help, I really appreciate it. Hopefully I'll have this thing up and running soon.

Are you looking at this harness? For the rest of my answer, I'm going to assume you are. Take your stock MAF and unplug it and remove it. You are left with a plug hat is routing wires directly to the ECU. You install your Map sensor and your temp sensor. All the harness does is connect your map sensor and your temp sensor to that empty plug that used to be connected to your MAF.


Now, when you are cutting and splicing inside the car, the information coming though the wires that used to be a MAF and temp signal are now carrying MAP and temp signals. Your translator intercepts these and then converts them back to what they "should be" and sends it to the ECU. In theory, the ECU should have no idea the switch took place.

As far as the pinouts, I'll have to look for a little bit. I'll post back up when I find your answer.