benben01,
Wiring Diagram should have it.
Do you mean to find the MAF/IAT sensor inputs to PCM module, correct?
I ask because there are two O2 sensors for each bank and they are position at the exhaust side.
Since you are building HHO generator, I am guessing you want the MAF wiring to PCM.
Here is what I found.
MAF/IAT sensor has 5-pin (A,B,C,D,F - inc. Power/Ground) into PCM (1AJ, 1AN, 1AL for MAF, and 1AF for IAT).
I will send you a scanned page if this is correct.
Please provide an e-mail address thru PM so that I can send you the pages.
PCM is located at the front right corner under the hood if you stand in front of the CX9 facing the windshield.
MAF/IAT sensor location should be obvious.