MAF Sensor wiring

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I'm trying to have a play around with the MAF sensor by modifying the signal the the ECU receives, but I can't quite figure out the pin out. There is nothing in the haynes manual about it.

I think it should have a 2nd ground for the chassis and ECU. Anyone know why pin 4 is 14.4V?


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4 is the ignition feed - 14.4v is alternator charging voltage so that's fine.

2 is earth as you say

1 is PCM reference (5v)

5 is MAF signal

The IAT is separate on this engine hence the empty pins.


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