4.6 volts = sea level, 2.6 volts = 10,000 feet. So I would guess 3.86 is about 4-5 thousand feet altitude. How high are you?

 

4876 ft. I have fuse number 4 in my distribution box out. It says it's just turn signal lamps. Would that have anything to do with my issues?

 

No it would not. The Barro is a three wire sensor, +5 volts from the PCM, a ground wire and the signal wire going to the PCM. The signal wire is the one that varies voltage in altitude. Sounds like the PCM and AE are reporting the correct voltage, which is good. However I cannot see the units being displayed on AE in your first post. Is it in PSI or some other weird pressure notation, like kPa? I don't have AE so no help on setup here.

 

I believe PCM uses raw volts and seems correct for your altitude. Scanners do the conversion for us humans in psi and other units. I would check AE setup, yea easy for me to say. 😎

 

It's showing up in psi. 148psi. Where the hell do I go from here if the correct voltage is shown for the corresponding altitude, but not the correct psi. Also why is it showing 0 without it in, and run so much better but shift horrible. Would the 1k potentiometer get ride of the hard shifts? Because I'm fine driving it this way as long as the shifts ease up.

 

148 could be a bad math equation. Tugly said there were a few that were off on some readers.

1k pot isn't going to fix it. Hopefully the PCM is fine and your program is wrong.

Sure it isn't 14.8 and you don't see the decimal point?

 

Lol Yeah Im sure its 148psi. The decimals on these digital gauges are huge and they skip an entire number slot so its alot more obvious one you have a decimal in the number.

 

Sorry I forgot about the screen shot. Scrolling mobile don't load them fast.

So it's either PCM or a wiring issue.

I wonder if using a pot could dial in other numbers to prove it being bad.

Or you can blow on it to see if any change in PCM reflecting the voltage. I did that with mine to test it.

 

I called my chip programmer. We very extensively went over all the things with my sensors. The AE is actually reading correctly, it just says INPUT when it should say OUTPUT from sensor. The 3.86V directly corresponds to the 12.6 psi at the map sensor. The Map sensor reads 12.4 psi but only because the Manifold pressure gauge reads -.02. So mpg + Baro= map. So the sensor is working correctly.

As of right now the issue I was having, that started this whole diagnosis test of the sensors seems to have worked itself out. It seems to have been just a bad trailed lamp fuse. The fuse must have been used to help ground the transmission. My tranny now shifts when it's supposed to and keeps power the whole way through. I think the jerking was just the tranny engaging and disengaging the TC rapidly because it was trying to get more power but couldn't find the ground. The jerking started the same day I destroyed my pass trailer lamp.
My AE won't read my tranny so I couldn't see what it was doing.

 

Thanks for reporting back on the outcome. I didn't realize you had a chip installed which compliments the troubleshooting. Good to know though.

 

Glad you found your problem and reporting back.

 

Trailer fuse, dang wouldn't think that would affect shifting.

Glad to hear it's doing better. You had to do some work to get here.

 

Thanks guys. Once again I know I shouldn't jump the gun with this truck and say it's fixed and it was the problem. But it is a drastic change.

I don't know if it was caused due to the chip being thoroughly cleaned. Or if it was the fuse.

Before when I would drive with the chip on heavy tow the engine would shift at about 2800-3k rpms. Now it shifts at about 3200-3500 rpms when towing and trying to get up to speed in heavy tow.