using aftermarket temp. sensors on 7427 ecm's

**grumbolt** · 03-01-2021

i am using a different temp sending unit than what came in the vehicle my ecm came out of...
it originally had a 4l60e in it which has the internal sensor,
and i am using a 700r4 in its place which this one does not have a temp sensor on it that i have seen.
i ordered a sensor that will go into the pressure test port on the drivers side but i suspect it will give erroneous readings.
if it does in fact give wrong readings, i was wondering if any of you know how to calibrate it.

i am using bdyt as my starting bin.
i have deleted the egr, and added the fan code for engine and trans fan control (you guys are awesome btw)

Advanced $0D TP5 v251.xdf as the mask

and use
A217 $0D TP5 v250.adx
A218 Trans1 $0D TP5 v250.adx
A218 Trans2 $0D TP5 v250.adx

to be able to see/log the data.

the above files were obtained from this forum.

from what i can figure there are several datastreams that the dashboard / data logging get their information from.
can you display information from several datastreams on the same dashboard?
is there a way to combine the adx files so that all the different adx values are available?
how is the unique ID determined?
how do you determine the "Packet Offset (H | D)"

thanks in advance for your help.

**edit to update that i am using 16196395 ecm ** i fat fingered the copy / paste

**honken** · 03-01-2021

The tempsensor use ohm and gauge converts it to f or c (the gauge has 0-90 ohm need a sensor with 0-90 ohm).
Diffrent values between senor, example1 has 0_-450 ohm other 0-90 ohm that can give errors.
Idont now if you can change to values from sensor you have to the data logging program .

**grumbolt** · 03-01-2021

thanks for the reply Honken, the sensor i have on the way may have the same specs as the oem 4l60e temp sensor.. i dont know honestly..
if it does awesome and it is plug and play...
i dont know specs on the oem i just planned on putting the sensor in water heated up to 190 degrees and seeing what the computer thought the temp was and going from there.

if the ecm doesnt see an accurage temp, i was wondering if there was a way to change the "scale / formula" of how the ecm sees it.

main reason for this is so i can run the $od fan mod that allows the ecm to control the engine and transmission fans based on their temperature

i guess i could just wire it up and then change what the targets are. for example if it says it is 250 degrees when it is actually 150 degrees, then set the fan on to 250, and the overtemp to 275. (just numbers pulled out of the air would have to experiment to find real numbers) but if i did it this way, then the adx file would need to be altered to change how the data was displayed ..

**honken** · 03-01-2021

Its over 10 years ago i hade 6395 ecm dont remember where i foud it,
When i hade ecm to control a relay to the cooler fan, it read from ecms tempsensor.
Pind some output that ecm didint used change adress in prom to read temp and did flag or table with temp to start and stop the fan.
Had an ostrich dident have to burn a prom

**grumbolt** · 03-01-2021

Originally Posted by honken

Its over 10 years ago i hade 6395 ecm dont remember where i foud it,
When i hade ecm to control a relay to the cooler fan, it read from ecms tempsensor.
Pind some output that ecm didint used change adress in prom to read temp and did flag or table with temp to start and stop the fan.
Had an ostrich dident have to burn a prom

i know the ecm is looking at pin B5 for a signal with B4 being ground.
i guess my question is if i am using a temp sensor that isnt oem, can i scale it in the ecm to have it react the way i want it to and to display the correct temp when i am datalogging.

for example, until the temp gets to 155°F i want the fan to remain off.
at 165°F i want the fan to turn on.
at 200°F i want the fan to remain on. and the ecu to set the check engine light.
when the transmission gets back down to 155°F i want the fan to turn off.

these temps will most likely end up being different, i will need to play with them to get it happy.