I put my commander in this past weekend to use as guages with a smarty & everything works great but the trans temp.I have the sending unit mounted in a diesel manor cooler line. I drove the truck again today up a mountain & it still wouldn't work. The only thing I can think of is maybe the sending unit isn't getting a good ground. thanks


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I had an issue with my temp reading starting high, and moving down when boost went up!?!?! Talked to Roark and he is getting me a new one sent out as soon as they get my old one. I checked the ground to the sensor and the Commander with no help. The temp sender resistance was changing way slower than the Commander was reading. Will know in a few days when the new one gets here hopefully!

 

Is the line ever isolated or mounted in rubber?

I am not sure exactly what the cooler lines look like and I am not certain how they mount. If it is rubber mounted anywhere that will be the problem.

Just for giggles you might stick it in the test port in the transmission to see if reads properly. If it does then it is probably where or how it is mounted. If it still does not work then it could be a couple of things. 1) bad sensor (not likely) or a problem with the tranny sensor part of the Commander??

It should only take a couple of minutes to temporarily stick it in the test port. You will have to give it enough time to come up to temperature though.

 

Yes the line has a short piece of rubber in it. It's a factory line with a compression fitting for the sending unit port. I'm going to try the test port this weekend when I get back home & see what happens. I'll have to lengthen the wire cuz it's too short to get to the test port. thanks again !

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The cooler line only has rubber on the lower portion of it though. On the upper side of things, it is a hard line. That would give the sender a proper ground, correct? Can you simply run a ground wire from the sensor to ground, or is something wrong with that?

Quad..... I contacted GDP again about the big line kit with the fuel pressure sender for the Commander and Richard suggested that I go with the kit made for the Jacobs exhaust brake. He said that the sender should hook right into that b/c the supplied banjo bolt has a port for the exhaust brake. The Quad sender would just go there. Do you know if this is true or sound logical?

 

[QUOTE=06CTDforAU;1572267]The cooler line only has rubber on the lower portion of it though. On the upper side of things, it is a hard line. That would give the sender a proper ground, correct? Can you simply run a ground wire from the sensor to ground, or is something wrong with that?



That's correct. Maybe the brass port in the compression fitting has too much teflon tape on it. I think I will try a extra ground wire first.
thanks

 

[QUOTE=Y_Knot;1572283]I thought so. You have a very valid point there with the teflon tape deal. That's very possible..... personally, I would run a short ground wire if you have a good grounding location there somewhere.

 

It sounds logical. Just make sure the port is 1/8"npt and it should work fine.

 

[QUOTE=06CTDforAU;1572299]I have seen that happen but, you would have to have a LOT of tape on that sucker!

I also agree that the cooler line should be grounded if the rubber is only one one side. The thing that I am not sure of is is the other end is anodized or anything like that. That could also be the issue?

It is pretty uncommon to have a problem with the transmission stuff though as they have been pretty fool proof. We have had a few manufacturing things that slipped through but, the transmission circuits are tested before they leave so it should be working.

Another thing is that if you run the transmission signal wire over the top of the transmission there should be plenty of line left over to make it into the test port. It is a lot closer to that little hole in the firewall than you realize if you take it up and over the transmission.

Also what is the tranny sensor doing? Does it just never come off of 100 degrees or is it doing something else?

 

Also what is the tranny sensor doing? Does it just never come off of 100 degrees or is it doing something else?[/QUOTE]


It never comes off the 100 degrees. I really think it's just a ground problem.

 

I do think it sounds like a ground issue. You are running the truck long enough for the temp to get over 100 degrees? I know a few people that make very short commutes and in between drive time the trucks sit for an extended period of time and they do not go over 100 degrees. Just a thought.

Usually if something is actually wrong it does not just sit there and behave at 100 deg, it will do something stupid.


Also note that I said "usually".

 

Like Quad said, if you route the wire over the top of the tranny there is plenty of wire. That's how I did mine.

 

Even under the tranny it will just barely make it!!! So I hear!!!

 

How hard would it be to just extend the wire? Ring terminals are readily available!

 

My tranny wire was WAY short also. It wouldn't even touch the top driver side of the tranny. A simple splice and new ring terminal and problem solved.