'91 X with Code 22

[rguy]

I just completed a manual to auto trans swap including a new/used ECM for a '91 with an Auto Trans. Now I'm getting this code, along with a couple others. Prior to the swap, I wasn't getting any codes. Code 22 is: MAP (vacuum) or BARO signal out of range - MAP. What is this telling me and how can I fix it? Where is the MAP sensor?

Thanks.

 

[BrooklynBay]

Check for a broken vacuum line.

 

[rguy]

Check for a broken vacuum line.

thanks.

Any idea how much vacuum the engine pulls at idle?

 

[BrooklynBay]

http://www.explorerforum.com/forums/showthread.php?t=197415

 

[MrShorty]

On a '91, it's a BARO sensor, meaning that it isn't hooked up to the manifold. It's simply a pressure transducer that tells the computer what ambient air pressure is.

Check the wiring between the PCM and the BARO sensor. The BARO sensor's output is a frequency, so you'll need a DMM with a frequency counter to check the BARO output.