4l80e always reads -38
09-10-2018, 07:25 PM
#3
Staging Lane
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Yeah its swap I did the sloppy mechanics 4l80e harness modification and blew up the first 4l80e which had trans temp working put this one in and hasn't been working
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09-13-2018, 08:52 PM
#9
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-38 DA? -38 degrees latitude? -38 dollars in checking account?
09-13-2018, 08:59 PM
#10
TECH Senior Member
09-13-2018, 11:01 PM
#12
TECH Senior Member
No mention in this thread of a 4L60E....
09-14-2018, 01:05 AM
#14
Staging Lane
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Come on what else is -38 obviously temp, you guys gotta be kidding if you don't know just don't reply don't try to be smart or funny, i felt it was pretty obvious what i meant
09-14-2018, 10:23 AM
#15
TECH Senior Member
-38 is WAAAAY below freezing. So it ain't temp, dude.
09-14-2018, 11:46 AM
#16
the trans fluid temp pressure modifier table goes down that for guys that live in canada.
its a resistive sensor so you need to verify it's getting the 5v it needs and the return signal is going to the right pin on the pcm. missing either will make it read -38 temp. I went thru this with the older 80e I use in my turbo truck. my fix was to delete the trans temps sensor DTCs
its a resistive sensor so you need to verify it's getting the 5v it needs and the return signal is going to the right pin on the pcm. missing either will make it read -38 temp. I went thru this with the older 80e I use in my turbo truck. my fix was to delete the trans temps sensor DTCs
09-14-2018, 12:53 PM
#18
No, I can't log anything at all. It wont come up in channels. There is nowhere for it to acquire data.
I only did that so my trans tune segment would not try and adjust shift pressures for it being cold as ***** (technical term for -38ºF)
What is the output from the sensor reading in voltage? probably somewhere in the 2-2.5v range at like 80º --just a guess.
If the sensor is getting 5v and you're getting an output voltage then the problem lies in the signal return to the pcm. Either the trans pinout is wrong or a connection isn't being made somewhere.
I'm not sure what pin gets the temp signal...you'd have to look on lt1swap.com for that probably
I only did that so my trans tune segment would not try and adjust shift pressures for it being cold as ***** (technical term for -38ºF)
What is the output from the sensor reading in voltage? probably somewhere in the 2-2.5v range at like 80º --just a guess.
If the sensor is getting 5v and you're getting an output voltage then the problem lies in the signal return to the pcm. Either the trans pinout is wrong or a connection isn't being made somewhere.
I'm not sure what pin gets the temp signal...you'd have to look on lt1swap.com for that probably