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This post filtering (and the restriction that creates) is known to have absolutely no effect on the HEUI system? Is there any CAT documentation about this modification?

This is an awesome write up! Very thourough. One question though. In the beginning of the post you mention that you had a bad gasket, but later you mention that there were no signs of gasket failure or leakage between the filtered and unfiltered sections. Why do you say the gasket is bad...

Might be more work than you want to do but the pins are present in the controller, and if you already have a J1708 port for the transmission, might make sense to just run the CTIS 1708 over there so you have access to both controllers. The DDT is just the right tool for the job on CTIS. It works...

It would be the proper course of action to simply ask the controller you have what is wrong with the system, and then repair from there. Dana Diagnostic Tool and a J1939 adaptor is what’s required for this.

Nice Catch and write up!!

On my M1082, that is used for releasing the brakes when the trailer is not hooked up to the truck, and it works on mine.

Wow 4 trumpets! Those look insane! They must stick through the grill in that forward facing configuration?

The stock horn on my LMTV was lame. @GeneralDisorder turned me on to an LMTV A1P2 air horn. All I had to do to mount this was cut a small peice of angle iron to attach it to the stock horn mount. It reuses the stock horn wiring and has the correct connectors already. I made a T fitting to tap...

https://www.steelsoldiers.com/threads/clogged-fuel-tank-vent-m1078a1.208153/

As mentioned in post 639 of the below thread, on my truck, the TPS comes from the J1587( J1708 ) Databus, so fiddling with J1939 is not going to help you. https://www.steelsoldiers.com/threads/eco-hubs-who-needs-3-07-gears.213516/post-2576768 I would recommend reviewing the Schematics for the...

Awesome!

So what I learned building my harness is that if you don’t have power going into the blackout pin, the display will stay off. So you should check for +24 at pins “S” (blackout) & “H” (ignition switched power) and then a good ground at “F” and “P”(reference ground). Check for these at the truck...

I have not run across one of those yet. I haven’t made it through my pile though so we will see. That’s the only code (from my reading) that Dana documentation points to a faulty controller. @GeneralDisorder has a compelling theory that when you change the config pins to over write the internal...

It’s pretty common apparently to get water intrusion in the 10 pin connector area of the CTIS harness and PCU, as well as grounding problems up at the dash and where the controller bolts to the panel. That little ground wire that is supposed to be clamped under the controller is actually the...

CTIS is one of the coolest features on our trucks. I’ve been wanting to make a bench testing harness for quite some time, and I finally got around to it. It’s part of the forum lore around here that the controllers are unreliable. In practice I think they are extremely robust. I bought a pile of...

Hello, you were correct on this action, I just verified with an M939A2 676422 controller that internal to the controller Pins “H” (power in) is shorted to pin “X” (J1939-) and that has got to be why your resisters fried, getting 24V straight to the bus. I checked multiple LMTV controllers and...

This is starting to read like Route 66 in the Grapes of Wrath! Good luck man!

According to CAT it de-rates at high enough altitude. I am speculating here that it controls smoke at higher altitudes, but I don’t have access to CATs programming to know for sure. They designed the engine, called for that component on the higher HP tunes, and throw a code when it isn’t there...

This was answered on post 32 here. https://www.steelsoldiers.com/threads/2003-m1078a1-3126b-330-horsepower-flash.212209/post-2485235

As you can see in the below screenshot, descending a steep grade in “2” on the keypad (1 as far as the Allison is concerned) has the transmission locked up and wire #132 enabled. Input speed and turbine speed are within an rpm of each other so that also confirms lockup. side note: TPS appears to...