i checked the green and black wires today and got 0V. i double checked the green wire from MAP end to ECM end and got 0 resistance.

does this mean my ECM or brand new MAP is bad? if the MAP is bad its kinda strange that my old MAP shows the same readings. all of the MAP wires check out fine with 0 resistance from end to end.

 

If you have 5 volts on the gray wire AND the green wire is good all the way to the PCM AND it shows O volts. Either the MAP is bad (unlikely) or the PCM is bad.

Of course everything is hooked up and the key is on when you did this, correct?

What happened when you jumped from the gray wire to the green wire with the connector OFF the MAP?

If you jumped the grey to the green and the reading did not change, (assuming all the wires are good) the PCM is defective.

By doing as I suggested in jumping the green wire to either the gray wire (maximum voltage) or the black wire (minimum voltage) you can prove the signal extremes and you SHOULD see the PCM report these 2 extremes.

If the wire (green signal wire) has been checked PROPERLY and you get no change from jumping green to gray and jumping green to black. You have proved the PCM is defective. I caution you that a wiring issue can do the same thing.

 

Do you know anyone around your area that can let you borrow their computer for some tests?

 

i did your tests today and got changes in the MAP. when i connected the green and black wires my MAP KPa jumped to 104.4 but the barometer stayed right at 10.7KPa

after the tests i was even more confused so i decided to take the MAP sensor off of my sisters saturn since she was at my house. i put the sensor on my car and saw my MAP and BAR shoot right up to where they are supposed to be.

i need to let my battery charge overnight, then i'll be able to start her up and see how she runs.

it really sucks that a brand new bum MAP sensor caused all of this trouble i have been having. i thought for sure it was the one part of the equation i could count on.

i'll post whether or not the car is running right tomorrow.

thanks for everyones help.

 

The MAP sensor feeds a single signal for both MAP and BAR to the PCM, but not at the same time. It reads the MAP voltage before the engine starts and saves the BAR reading, and it holds that for a while before it updates it. Then when the engine starts, the MAP sensor is used only for MAP, and only updates the BAR periodically, and I'm not sure how it can even do that when the engine is running.

 

Before I read the last line of your post, I was getting ready to ask that.

 

got the new MAP sensor in today. the car started up and shut off and threw a DTC 33 (low vacuum). could loose valves cause this code, i had loosend the valves a bit after having the DTC 34 because i thought they might be the culprit but they arent very loose? i dont think i have an intake leak.

 

What are the signs of a intake leak?