1996 P0102. need advice.

[Blacksmith1]

pulled the code. decided to run a voltage test, power in 12.56 ground 12,56, pcm ground with power on 5.56 volts...... wait..... isn't that supposed to read 12.5x also? Huston we have a problem. I didn't test the pcm power side of the connector yet. anyone know where I should go next?

 

[franklin2]

You are checking the mass air sensor on a 1994 ranger with a 4.0 engine? Oh wait a minute, the title says 1996?

 

[Blacksmith1]

Soooo, nobody has any ideas?

 

[Blacksmith1]

Just realized I didn't list the engine. 3.0 with a manual if that matters

 

[lowspeedpursuit]

Without deep-diving into any resources, is one or the other of us misunderstanding the test? It's a 5v sensor. Sig return, as a ground, could measure 12v to batt positive. I wouldn't expect it to ever be 12v in use.

I assume the diagnostic flowchart for MAF bullshit is more-or-less checking 3 things: wiring, MAF, PCM. I can post powertrain diagnostics when I'm more free.