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4spd auot temp sender unit
Posted: Sat Oct 04, 2003 11:00 pm
by dagsy
where can i find the atf temp sender unit for a 1990 awd 4spd auto. want to install a guage rather than the standard idiot light
Posted: Sun Oct 05, 2003 12:50 am
by vrg3
Does this picture help at all?
www.graphics.cornell.edu/~v/pics/atf_temp.gif
It may be simpler to cut the line going to the ATF cooler in the radiator or something, though...
Posted: Mon Oct 06, 2003 2:26 am
by Legacy777
Posted: Mon Oct 06, 2003 4:22 am
by vrg3
I think he wanted to pull the stock sender out and replace it with a sender for an actual gauge... But perhaps one could read the signal from the stock sensor instead.
Posted: Mon Oct 06, 2003 1:45 pm
by Legacy777
ahhh ok...
Posted: Mon Oct 06, 2003 11:28 pm
by dagsy
that's right. but if you use the oem sender, it is simply an on/off switch so the guage open circuits. the guage came with a sender so i think a tee tapped into the cooling line might be the easiest option like was mentioned earlier
thanks for your help guys
Posted: Tue Oct 07, 2003 2:45 am
by Legacy777
Not sure I understand what you mean that the OEM sender is on/off....
I have a select monitor and can view my trans temps to the degree.
Posted: Tue Oct 07, 2003 6:09 am
by dagsy
it's an oz liberty and only has an at fluid warning light that comes on when the auto fluid gets to hot. not hot sender is off..gets hot sender contacts and lights light. not a switch as such more of a thermo contact. engine oil psi is same.
Posted: Tue Oct 07, 2003 6:23 am
by vrg3
Oh, huh... so it's different overseas. On North American models, there is a thermistor-type ATF temperature sensor that the TCU uses. The TCU turns on the warning light if, based on the signal, the temperature is too high.
Posted: Tue Oct 07, 2003 6:50 am
by dagsy
like leg777 said i might try the tcu, having had a better look at his pic.
where do i find this tcu
Posted: Tue Oct 07, 2003 7:11 am
by vrg3
The transmission control unit on LHD models is mounted under the driver side dash, kind of between where the ECU and the steering column are. I have no idea where it would be on your RHD model, though. Where is your ECU?
Posted: Tue Oct 07, 2003 7:17 am
by dagsy
in between the steering column and the side of the car
Posted: Tue Oct 07, 2003 7:18 am
by dagsy
in between the steering column and the side of the car
what does it look like
Posted: Tue Oct 07, 2003 7:47 am
by vrg3
It's a kind of brass-ish colored rectangular box with three black wiring harness connectors:
http://www.graphics.cornell.edu/~v/pics/tcu.jpg
Posted: Tue Oct 07, 2003 2:23 pm
by Legacy777
here's a pic, the labeling is incorrect. It should be TCU, not ECU
http://www.surrealmirage.com/subaru/ima ... tors_1.jpg
As for the little light that comes on. That light may only be an on/off type thing, but more then likely the sender in the transmission measures the full range of tranny temps, and signals the light to go on once the temp reaches a set point.
Posted: Tue Oct 07, 2003 3:06 pm
by vrg3
Legacy777 wrote:As for the little light that comes on. That light may only be an on/off type thing, but more then likely the sender in the transmission measures the full range of tranny temps, and signals the light to go on once the temp reaches a set point.
Based on what I've seen in the service manuals, that is correct, except that the light is signaled by the TCU, not by the sender directly.
