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Unread 06-30-2009, 08:25 AM   #1
04TJSport
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42rle temp gauge

any one know where i can get a temp gauge for my tranny? also and how easy is it to install?

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Unread 06-30-2009, 08:42 AM   #2
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its an aw4 but you get the idea.
http://www.stu-offroad.com/engine/aw-4/aw-4-4.htm

there is a temp gauge already in the trans, and you could conceivably access the info through X-Gauge using a Scangauge II, but I have no idea how to do this.
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Unread 06-30-2009, 08:52 AM   #3
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scanguage doesn't have an app or code for trans temps on the TJ/LJ. I wish it did.
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Unread 06-30-2009, 09:00 AM   #4
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Quote:
Originally Posted by roadkill View Post
scanguage doesn't have an app or code for trans temps on the TJ/LJ. I wish it did.
I was hoping someone smart could use X-Gauge to program their own code, thats what the feature is for.

Info for someone smart:
http://www.scangauge.com/support/pdfs/XGAUGE.pdf
http://www.scangauge.com/support/pdf...e%20Coding.pdf
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Unread 06-30-2009, 10:01 AM   #5
Jerry Bransford
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Since Jeep trannies don't come with a tranny temp sender, no gauge is going to be able to give the tranny's temp. You need to either weld a tranny temp bung into the pan or place a sender in the coolant line before you can know the temperature.

I have senders in both the pan and line, and have a switch for my tranny temp gauge (B&M and Autometer make them) so I can check both temps.
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Unread 06-30-2009, 10:37 AM   #6
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Quote:
Originally Posted by Jerry Bransford View Post
Since Jeep trannies don't come with a tranny temp sender, no gauge is going to be able to give the tranny's temp. You need to either weld a tranny temp bung into the pan or place a sender in the coolant line before you can know the temperature.

I have senders in both the pan and line, and have a switch for my tranny temp gauge (B&M and Autometer make them) so I can check both temps.
Since the 42RLE is electronic and uses a TCM, there is probably some sort of temp sender already present.

Unlimited04 mentioned this, but I'm not familiar enough with the 42RLE to say one way or another.
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Unread 06-30-2009, 10:43 AM   #7
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the 42RLE does have a temp sensor in the side of the housing. the TCM uses it to determine shifts & lockup depending how warm the trans is.

DTC codes for it:
42RLE Code (DTC) P0711 Trans Temp Sensor, No Temp Rise After Start
42RLE Code (DTC) P0712 Trans Temp Sensor Voltage Too Low
42RLE Code (DTC) P0713 Trans Temp Sensor Voltage Too High
42RLE Code (DTC) P0714 Transmission Temperature Sensor Intermittent

Its wire #54 on the pinout, page 8:

http://atsg.biz/articles/html/Jeep%2...Supplement.htm

the 2004 FSM outlines the shift scheduling in Section 3.2.2 based on trans oil temperature - http://www.jeepforum.com/forum/showp...0&postcount=43
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Unread 06-30-2009, 10:57 AM   #8
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It may have a sensor to tell the computer if it's too hot or too cold but I don't believe it can give the kind of output needed for a gauge to know the actual transmission temperature which requires an actual temperature gauge sender.
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Unread 06-30-2009, 11:32 AM   #9
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Quote:
Originally Posted by Jerry Bransford View Post
It may have a sensor to tell the computer if it's too hot or too cold but I don't believe it can give the kind of output needed for a gauge to know the actual transmission temperature which requires an actual temperature gauge sender.
Actually I believe it is an actual sending unit that sends a variable voltage signal to the PCM based on the temperature. If you could pinpoint the exact relationship of voltage level to temperature, you should be able to use it to run a digital gauge.
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Unread 06-30-2009, 12:17 PM   #10
Jerry Bransford
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Quote:
Originally Posted by les.delancy View Post
Actually I believe it is an actual sending unit
What do you base that on?
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Unread 06-30-2009, 12:53 PM   #11
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Here is a graph from the FSM:

transmission-temp-sensor-42rle.jpg
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Unread 06-30-2009, 01:31 PM   #12
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Quote:
Originally Posted by Wheelin98TJ View Post
Here is a graph from the FSM:
oh man, thats awesome info! now we just need to put together the TXD, RXF, RXD and MTH codes to program into the X-Gauge to read voltage.

I tried 3 of the Ford Trans temp sensor codes and got a constant value of 5126 back...definitely not it.

EDIT: I just called Linear-Logic (they make the Scanguage II) - I sent them an email w/ the above chart and talked with a knowledgable person. They should get back to me soon about the TXD, RXF, RXD and MTH codes (if/how they can read this sensor).

Last edited by Unlimited04; 06-30-2009 at 01:45 PM..
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Unread 06-30-2009, 09:29 PM   #13
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I've dabbled with the 42rle sender also and just ended up tapping the the line...

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Unread 07-01-2009, 06:07 PM   #14
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Install the sending unit in the transmission line with a "T" fitting and a ground wire...
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Unread 07-01-2009, 06:43 PM   #15
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Originally Posted by mudb8 View Post
I've dabbled with the 42rle sender also and just ended up tapping the the line...

So does tapping into the line with a digital temp gauge give correct readings?
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