Pinout for a '03 PCM?

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heppm01

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Trying to diagnose P0452 and P1639 DTCs and I could really use a pinout for the PCM. I'm pretty sure it's a harness short somewhere but before I undertake that nightmare I want to make sure the PCM is putting out a good signal.

If you don't have the entire pinout, I'm really just looking for the 5V ref b (or 2) wire (gray).

Thanks!
 
The first code is for a gas tank pressure sensor and the second is the A/C system sensor. Have you checked those sensors?
 
Klokworx - thanks a bunch!

The P1639 is a 5v ref b low code (which yes, feeds the AC pressure sensor). With both sensors disconnected I am not getting a 5v signal at either connector, so it's either not present at the PCM pin, it's shorting to ground somewhere or there is an open somewhere before the wire branches to the two different sensors.
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