Hi,
Looks like Pin 1 (black) is sensor ground. Pin 2 (light green/black) is MAF ground in the PCM, Pin 3 (white/blue) is battery voltage. Pin 4 (green/red) is the signal wire to the PCM.
I attached a couple shots of the wiring diagram if that helps. Please let me know if you need more information. Thanks
Images (Click to enlarge)
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Thursday, June 6th, 2019 AT 2:35 PM