the map sensor can be tested , with engine not running first. keyon
the map uses power +5VdcRef from ECU to power it , 4.75 to 5.25vdc spec for power. so this is first test , +5vdc on power pin,
then pin gray green is output. (other wire black is ground)
using a hand vacuum pump/gauge and DMM meter for output pin, voltage, easy. using my chart.
key on is near 3.9vdc, this voltage is at 500ft altitude, by me, and my meters.
then start the engine or pump the hand vacuum to 19inches HG mercury reading. get 1.2vdc.
can do that with engine running too, 800rpm hot idle, (if the voltage can not rise there will be no power to drive any 8valve engine ( this is not the EGR MAP !!! seen on some 16v)
i made this for 3 kinds of gauges, bar (ROTW) and USA imperial HG. (ROTW means rest of the world)
Bar below is not any kind of weather barometer, it is for engines only tool.
I have 1000lbs of bricks in my trailer and had full power, from this car so , is at full 80HP.
![[Image: 523_map.jpeg]](https://fixkick.com/forum/gallery/523_map.jpeg)
the map uses power +5VdcRef from ECU to power it , 4.75 to 5.25vdc spec for power. so this is first test , +5vdc on power pin,
then pin gray green is output. (other wire black is ground)
using a hand vacuum pump/gauge and DMM meter for output pin, voltage, easy. using my chart.
key on is near 3.9vdc, this voltage is at 500ft altitude, by me, and my meters.
then start the engine or pump the hand vacuum to 19inches HG mercury reading. get 1.2vdc.
can do that with engine running too, 800rpm hot idle, (if the voltage can not rise there will be no power to drive any 8valve engine ( this is not the EGR MAP !!! seen on some 16v)
i made this for 3 kinds of gauges, bar (ROTW) and USA imperial HG. (ROTW means rest of the world)
Bar below is not any kind of weather barometer, it is for engines only tool.
I have 1000lbs of bricks in my trailer and had full power, from this car so , is at full 80HP.
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