'91 X with Code 22 | Ford Explorer - Ford Ranger Forums - Serious Explorations

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'91 X with Code 22

rguy

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'91 Explorer 4x4
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.
 


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BrooklynBay

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rguy

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MrShorty

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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.
 




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