Okay so I'm testing my map sensor now.

Obviously I don't have a $600 test harness so I'm testing it like my tps.

I hooked my vacuum gauge directly up to it and cut open the signal wire which is the middle wire on the map sensor. I then plugged in the map sensor and turned the ignition to on. I put my power lead on that wire and ground wire to ground on battery.

Mitchell says voltage should be 3 volts. I'm getting around 5.21v

It says that with vacuum applied in the following manner I should be getting the following readings.

0 -> 2.8-3.0

5 -> 2.3-2.5

10 -> 1.8-2.0

15 -> 1.3-1.5

20 -> .8-1.0

25 -> .3-.5


When I give it 25 in of vacuum the lowest it will go is 4.26v . Did I test this thing right and if so I'm assuming it's safe to assume this thing is bad ?

thanks in advance

 

Based on your measurements I would conclude the MAP sensor is out of spec.

 

cool thanks man

 

I put the wires back together and started it up and it's finally throwing a code. I think it was just bad enough to where it wasn't throwing a code for me.

 

Before you replace the map sensor you should confirm that there is ground at the connector through the signal wire and the ground wire.