checking my map sensor...how to?

[TD or Not TD]

I just bought a new map sensor for my car and i want to check the voltage of it at idle or just with the key on to see if my wires are good,i checked my vacuum lines and they seem to be fine. anyone know what i need to look for and what wires i need to check between ect? its a 91 T1 Shadow.

[iTurbo]

On the MAP sensors in my cars, the Black/Blue wire is sensor ground and the Green/Red wire is the MAP signal.

[TD or Not TD]

what voltage is the map signal supposed to be? so i can check it either with the key on or at idle ect.

[iTurbo]

I've found that a 2-bar MAP outputs about 2v (0vac-0psi) with the ignition 'on' and engine 'off'; .75v (15 in/hg) at idle, .25 (20 in/hg) full decel, and 4.2v at 14 psi boost. I live at ~4500 ft elevation so you're results may vary a little.

[TD or Not TD]

Ahh alright, thanks for the helpfull information

[TD or Not TD]

Well i checked the voltage, 2.39 @0psi(key on engine not running) and idle at about 800rpm ish and it was 4.93V!!!! i had to cut the harness and rewire it in so i think this might be the problem, the sensor was good when i had it on my other car. i checked it across the redwire(has a stripe) and black(has a stripe)

[Stevien1]

4.93v- are you sure you weren't probing the 5v supply from the SBEC? On my 90 T1 minivan, the signal wire is the middle one.

-Chuck James

[TD or Not TD]

well i figured out i got 2 wires crossed when i double checked them. now it runs perfect just still get code 36 for my wastegate solenoid