Mechanics

WHAT TERMINAL ON THE MAP SENSOR PLUG IS GROUND?

1995 Mitsubishi Mirage • 120,000 miles

My check engine light came on throwing a code 105 which is map/barometric pressure circuit malfunction. I ran through the tests but I cant figure it out because I dont know what the terminals are. The thing that puzzles me is all of the terminals have some kind of voltage its a 3 bar connector, the first wire (green) has 5.3v second (black) has.04v and third (white with red stripe) has.04v I checked for resistance in the plug and it shows none. I dont know where to look from there? I also changed the map sensor and reset the ECU but it threw the code again after driveing a few miles. Thank you I appreciate your help.
Avatar
Eddietomas
August 29, 2012.



http://i1198.photobucket.com/albums/aa448/Wrenchtech/118945725.gif


Wrenchtech
Aug 29, 2012.
Thank you sorry im not to good at reading the diagrams are 2&3 both grounded?


Tiny
Eddietomas
Aug 29, 2012.
None of them are externally grounded. They all go through the PCM but the PCM supplies ground to #3 to read the signal return of #2. #1 is a 5v reference.


Wrenchtech
Aug 29, 2012.
Ok does that meen my readings look alright? Thank you again for your help


Tiny
Eddietomas
Aug 29, 2012.
Terminal # 3 is the ground wire through the PCM but it is also linked to the other sensors such as TPS, IAT, ECT.

There must be continuity between the black wire and body ground.


KHLow2008
Aug 29, 2012.
As stated earlier, that ground is controlled by the PCM so the PCM has to be powered for testing it.


Wrenchtech
Aug 29, 2012.