On the 24 valves there is a ECM enabled feature to ramp up idle at cold ambient temps,but is limited to certain temperatures. Anyone familiar with this feature knows that the window of operation is narrow The newer common rail has a new feature where you can control engine speed to 1500 rpm with the use of the cruise control switches. The question is ,does anyone know if this new feature is able to be activated or enabled on the older 24V engines? Tony

 

Simple answer... NO

 

I was wondering if anyone has experimented futher with the p.t.o. lead in the under the hood to increase idle. i remember reading that giving it 12 volts momenterely will increase idle. also using a toggle switch, if u toggle it on off, on off, up to three times, u progressivly increase idle speed... anyone out there try this ?

 

This wire goes to the PCM and shuts down some functions when the PTO is engaged. It will do nothing for increasing the rpm's. You would probably blow something if you fool with it. It has no use that you can use. I thought the same at one time and traced the wiring in the service manual to determine what it was.

 

I have grounded the wire and it does nothing. When looking in the service manual, it describes that it shuts off certain OBDII functions,but that is on a gas motor. There is no description what it does on Diesel. The PTO lead i have been told can enable high idle somehow,but i don't know. That wire which is orange,leads to pin # 26 of the Cummins ECM and was told by a Cummins tech to either momentarily ground it or ground it. It had no effect on idle speed. I don't know what 12V would do. I talked to one of the trans guys featured on this sight and he also said that he saw a Cummins Rep do something with that wire to kick up idle but couldn't remember what it was. I found a sight which shows how you can tap into the APPS, but that was on a Ford. I will try to post the sight and maybe someone could figure out how to adapt it to the Dodge Tony

 

http://www.thedieselstop.com/content...e%20Controller This is the sight where i saw the Ford design.

 

Even if you could (and I doubt you can) you're messin with some expensive hardware.

Get a stick, use the cruise or re-flash for the warmup.

 

sticks are a pain! Can't use the criuse(yet) Have the warm up enabled but window of operation is limited.

 

I agree that a stick is a pain. The price of the aftermarket high idle box is outrages too. The person that made the cool down timer should come up with a descent priced high idler for the 2nd gen trucks. I bet he would sell a bunch.

 

How about an old manual choke cable with the end attached above the hinge on the gas pedal?

 

I remember reading a post a long while back that you need to momenterily give it 12v...not ground it.....each time u give it 12v u progressivly increase idle speed to a max of 1200rpm...on the fourth 12v juiceing it returns to normal idle...
anyone try this ? and i do remember specificly not to ground the wire..

 

I'll try it one more time. This wire does nothing in relation to raising idle speed. When the PTO switches this wire, it shuts down some PCM functions. Never researched what functions it changes, but it has nothing to do with idle. Don't you think that after several years of this board and others going into every facet of second gen Dodges, someone would have put it to work?

The Cummins ECM has high idle features along with several other additional functions but we do not have a Cummins ECM, we have a Dodge ECM. The Cummins ECM has 100 contacts we have 50. There are two plugs on the Cummins ECM, we have one.

The Cummins handles the features of both the PCM and the ECM where we have two that were set up by Dodge. The ECM and the PCM. One day I plan to install the Cummins ECM, should have done it at the last engine change. I did not because of the wireing involved.

 

You are quite correct that the PTO wire shuts off certain functions to the PCM of a gas engine. But this same wire is run to the Cummins ECM instead of the PCM without explanation in the service manual. Since diesel does not have to be OBD II compliant what would be the purpose of installing this wire. I did not try the 12V yet,but it seems to make sense that this wire should do something unless the ECM does not have the software in it. Thought about the choke cable idea and like it but i think it would pull and bind when you depress the accelerator. Anyone look at the wireing diagram i posted?

 

So that takes the time to wip up a nice schematic, take pics, solder his conections, and mounts his finished prod in that ugly plate