[cbatters]

Originally Posted by rdmelton

I have read about boost logging for a while, and now that my engine is back together, I am about to attempt it. I purchased the MSD 3 bar MAP sensor from summitracing.com (under $60 shipped), but it's on backorder until 8/4. so anyway, I decided to go ahead and look at the wiring for it in the mean time. It appears that the wire colors aren't the same on my car (93 Stealth TT), but that's not surprising, because I've found many differences in wiring colors between different years/models. So being not electrically inclined, I wanted to confirm the wiring so that I hopefully won't screw anything up.
I believe that the 5V signal is pretty straightforward: it is PIN #1 as identified in the 3/S repair manual, correct? (the uppermost wire when it is connected to the TPS) FYI: I checked this in the manual to make sure, and on my car the color is green/yellow, not green/white as you stated.
For the EGRT signal and ground, the wire colors on mine are white/black and black. I believe that the white/black is PIN #1 as identified in the manual, and the black is PIN #2 as identified in the manual. So I'm assuming that PIN #2 is the wire that needs to be connected to ground on the MAP sensor, and that PIN #1 is the signal from the MAP sensor?
Is that right?

Logic / reasoning sounds good. However, I am troubled by the differences in the colors. The color coding I posted was straight out of the manual and I don't recall any differences when I went to hook it up.

UPDATE: Went back and checked notes / schematic and you are right about TPS, it is Green/Yellow, not Green/White. Manual says EGRT sig is LightGreen/Black but I will check this tomorrow to make sure.

I would suggest you confirm all voltages with a meter before connecting to the MAP sensor.

+5 signal from TPS sensor should +5V +/- 5% with respect to chassis/EGRT ground
EGRT Ground should be very close to chassis ground
EGRT signal should measure ~ +4.5V with respect to ground



Clint