Engine/Transmission (1998.5 - 2002) Ohm specs for MAP sensor.

[tmacc]

I was expecting a sensor that looks like a IAT sensor. Thought part of it had broken off. Anywho, here are the readings I got.

Pin AB 10. 89k ohms

Pin AC 1. 727k ohms

Pin BC 11. 22k ohms

Taken at 72. 5 F degress

Is this a good sensor or not? I don't have access to a scan tool. I saw a post when I did a search, but darn if I can find it again on the 15 pages that came up. TIA

 

[tmacc]

Taking it to the top

 

[Graphic man]

Boost Voltage

0 -- 1. 045

6 -- 1. 48

10 -- 1. 75

15 -- 2. 05

18 -- 2. 27

20. 5 -- 2. 44



Hope This Helps



Scott

 

[tmacc]

Scott thanks for the reply, but how do I check the voltage w/ the truck running. Doesn't take a scanning tool?

 

[Graphic man]

YOU WOULD HAVE TO HOOK UP A VOLT METER AND RUN IT IN TO THE CAB AND DRIVE WITH THE BOOST GAGE AND CHECK IT THAT WAY,

THERE MAY BE AN EASER WAY TO CHECK IT BUTS THATS THE ONLY I KNOW



HOPE IT HELPS



sCOTT

 

[rivercat]

my scan tool reads "HG or inches of hydrogen? any conversion availible to convert "hg to psi ?

 

[Graphic man]

i have the book at home but i am at work, but i did find this web site. hope this helps

http://www.sciencemadesimple.net/pressure.php



Scott

 

[Fishin Guide]

YOU WOULD HAVE TO HOOK UP A VOLT METER AND RUN IT IN TO THE CAB AND DRIVE WITH THE BOOST GAGE AND CHECK IT THAT WAY,

THERE MAY BE AN EASER WAY TO CHECK IT BUTS THATS THE ONLY I KNOW



HOPE IT HELPS



sCOTT

I use a regulated air source. Works like a charm!



Dave

 

[rivercat]

thanks graphic man helluva good tool

 

[Graphic man]

I also have IAT specs if anyone need them

 

[tmacc]

G-man, are they ohm specs?

 

[Graphic man]

as far as i know it is voltage

 

[rivercat]

hooked up the scanner and took a drive today. I read the MAP at 59. 3 "HG at idle and it pegs at 75 "HG from 20 lbs up to 32. According to the conversion this is 29. 13 psi at idle and 36. 8 for being partially spooled to all the way. What does this mean?



Is the catcher giving the scanner false readings as part of the boost fooler function or is my MAP sensor shot?



seems to me like a boost fooler would hold the MAP signal at 22psi or 44. 8"HG or what ever the factory specified limit is even though it read higher

 

[Donniey1]

Is your check engine light on?? Mine was coming on and the code said my MAP senor was bad. I found out that I had the 7. 0 vers. comp box. It was causing this. I sent it back and they upgraded it to a 8. 0 for free, I never had a problem after that Look on the back of you box to see what version you have. Hope this helps

 

[nps]

My understanding is that the Catcher isn't a boost fooler. Since it is the ECM, marco's program doesn't take action on the signal level of what a stock ECM program would think is an overboost condition.



Having said that, assuming you did the conversions (I didn't check) there is no way that your numbers are right (22psi at idle). Either the MAP is shot or your scan tool scale is different that what you are expecting.

 

[rivercat]

I suppose that the inch/mercury scale is better for measuring vacume as in a natural/aspirated application and not pressure as in our instance.



I guess I could swap the catcher back out and see if the readings are still too high.