Trans or PCM issue?

lundi 5 janvier 2015

My 96 is doing something I can't fully explain.

It is going neutral in gear, and the only thing I have noticed that coincides is the volt meter being at 12v rather than 14v like it should be.

I think this ties in with the grid heater function as it seems to be shortly after I start the truck.



The other issue is that several times while running ~80mph (according to the GPS) on my way home the transmission was trying to drop out of overdrive, and judging by how high it was trying to Rev, I think it was trying to downshift to 2nd.



The only other time I had it downshift like that was when I had first bought the truck and a battery cable was dead shorting the entire electrical system.



Plenty of good clean transmission fluid in it.



I think it's the electrical supply to the PCM but what specifically should I look for? I'm curious about the excitation of the alternator and the fact that the voltage stays low as long as it does.



I do have a pot for TPS and the percentage is pretty high. It isn't attempting to shift OD until 60mph right now.



Thanks for any input

Kyle




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