Map sensor and Barometric pressure sensor not corolating

[jaded13640]

This thing is giving me fits,
I've changed both the sensors.
Both have voltage, I'm getting, going from memory hear, like 5 volts and the other is right about the same.
I doubt it's an issue in the wiring harness as I'm getting voltage to both.

I can only assume it's the computer but how do you test the computer without getting ripped off at the dealership?

Any other ideas?

One thing I've done in the past when a motor has crap for power is to cut open the cat and remove the catylist. Normally they run like they're brand new.
This one, I removed the exhause before the cat and it runs the same.

The code it thows is baro sensor is not corolating with the MAP sensor. ie the reading must be close, they are.

What would cause them to not corolate? Especially if both parts were changed...several times. I first replaced them with parts I knew were good and later replaced the good parts I had with new parts from the dealer.

I'm at a loss, it's really kickking my butt and I HAVE to have this squared away by tomorrow.

Please help me.

I won't be here during the day to recieve replies so if you can help,
Please call me.
Wayne (517) 282-7570 I'll be working so if I dont' hear the ring, leave a message and I'll call right back. I check messages very frequrently.

Thanks again guys, I know this is short notice but I'm in a huge pinch.

The last thing I tried was to remove the turbo and inspect it. Everything is like brand new.

This is a 6.0L Powerstroke Diesel used in an ambulance.

Thanks again,

Wayne

[Evil Eye]

Hi Wayne,
What is the failure code you are getting? Is it a P0105? What are the pressures you are getting from each sensor? You need to have a good diagnostic scanner that can do that conversion for you. I'm assuming based on the diagrams below that those sensors are linear. If you don't have a way to check the sensors and you confirmed that they were replaced with known good sensors, I would start checking wiring for a short.

[jaded13640]

Evil Eye, I didn't write down the code or the values from the scanner.
It's a good snap on scanner, that shouldn't be a problem.

The boss sent the truck out to the dealer to have them figure it out.
If they figure it out I'll let you know what they say.

Thanks for the reply and the schematics.

Wayne