Engine/Transmission (1998.5 - 2002) Cheap High Idle, Oem Feature?

[Goddard]

um... ... ... . well??????????????????????????????????????????????????????????????????????anything new????

 

[jboehm]

I can understand the resistor bit. . but... , BUT,. . I'm making the assumption you are taking your initial reading from the PTO wire, to a ground, in my case, the - battery terminal. What if you have NO voltage reading at all? That means there ain't crap in that wire. My voltmeter will read negative or positive voltage .....



Cooter, gimme a call or PM.

 

[emjay]

If there is no voltage between the pin and ground, then measure the resistance from the pin to ground. If it's high (>1Mohm), the pin probably goes nowhere. If it's close to zero, it's connected to ground or a low impedance output.

 

[Chipstien]

Has anyone tried the dealer that Gizmo used. After all he did get it working for a short period. Maybe only the HD transfer cases have the programming neccessary for this modification. 11 pages has to yield something out of this.

 

[Diesel Freak]

just a couple of thoughts.



doesnt the Cruise control require the truck to be in gear and above a certain speed to engage?



what if we fed the ECM a bogus signal that said " I am in gear and at 60 MPH" then we just set the cruise control.

 

[emjay]

Sounds good in theory, but, there's a closed control loop in the firmware known as a PID controller loop that is somewhat tuned to an expected range of response of the vehicle speed to a certain throttle movement. With no load on the engine, it would make the control loop unstable, causing the engine to rev up and down, like a cat chasing its tail.

 

[JCyrbok]

wow!

Holy crap my head hurts. This has got to turn out to be one of those " it was right infront of my face" kind of solutions. Does anyone know what functions/codes are disabled when the PTO switch is engaged? Could they possibly counteract the PTO if certain criteria aren't met? I used to work landscaping and one of out big dump trucks would not engage the electronic PTO if the parking brake was not on. I have no idea if this was a manufacture thing or what but it was obviously a safety thing.



This thread is real interesting and I would like to know the outcome. I like to warm my truck up on cold mornings when I'm changing out of my uniform to go home from work. Usually takes about 10 minutes, which as it turns out is about 5 minutes too long. I would also like to save the money that the PS unit costs and put it into something else. I can wire a house but when it comes to my truck I take a hands off approach as I am kinda clueless. I have the cold weather PCM update but it never kicked on last year and it was cold enough atleast a couple of times. I'll have it checked



Just wanted to touch on a point that I did not see in any of the other posts (the codes). It also just occured to me that if u energize the PTO lead, is that causing something in the trans/transfer case to move to engage the absent "accesory. " Could it be bad, like dry firing a gun over and over? Oh well time for a couple of excedrine and several beers to remove my headache.



Lets get this one licked, if for no other reason than to say we did.



J-

 

[jboehm]

"With no load on the engine, it would make the control loop unstable, causing the engine to rev up and down, like a cat chasing its tail. "



Emjay,



That would REALLY get the neighbor's attention at 6am on a cold morning <G>

 

[JCyrbok]

wow #2

Head still hurts and did nt get much sleep thinking about his one. LOL.



I would also assume that for the auto trans that it would maybe have to be in neutral and not park, as the transmission would have to get physical power to the "PTO. " For the few that have gotten this little gem of a problem to work; Do u have an Auto trans and did it have to be in neutral?



Oh well just trying to help brainstorm this one.



Later

J-

 

[emjay]

Again, I refer back to my previous post about the Premier Power Welder in my Jeep, and the fact that it has a mechanical vernier throttle adjustment. It's like a choke, but you turn it instead of pull it, and it will slowly raise the idle speed, just as if you had a stick on the accelerator pedal. Granted, it requires manual intervention, but the concept is simple. You can see a picture of it (albeit with the entire kit) here I've seen those cables before, I'll bet that you can find someplace that sells them individually.



Is a timer a must-have?

 

[dartos]

So what is the latest on this subject?

I am having the cold weather idle done tomorrow. Broadway dodge in Denver knew exactly what I was talking about. I will ask about the PTO and see if they know any thing.



Jeff

 

[parttime]

high idle

I'm with dartos. Is there anything new on this subject or did everyone just give up?

 

[emjay]

I take it you don't like the vernier throttle idea I posted. That seems the easiest.



I did see somewhere a gizmo that plugs in between the APPS on the engine and the harness that basically acts as a remote throttle. For the life of me, I can't remember where I saw it, though.



In theory, all you have to do is tap in between the APPS and the ECM and replace (or override) the throttle validation switches and TPS signal. That can be done with Radio Shack parts. You will have to cut wires, though.

 

[kaffine krazed]

I've asked STAR about it and they said there was no way to change the idle speed for pto use. They said the PTO wire only disabled some of the OBDII monitors but they didn't know wich ones. They have been wrong before though.

 

[Amianthus]

Originally posted by emjay

I take it you don't like the vernier throttle idea I posted. That seems the easiest.

emjay, you're missing the point of this thread. It's not what can be used to establish a high idle. It's about using the function that is supposed to already be in the ECM for a high idle. We all know about using vernier throttles, sticks on the gas pedals, bricks, blocks, springs, vacuum pull-offs, and on and on.

I did see somewhere a gizmo that plugs in between the APPS on the engine and the harness that basically acts as a remote throttle. For the life of me, I can't remember where I saw it, though.

This is the Practical Solutions high idler. It's also been mentioned in this thread before. But again, that's not what we're trying to do. We already know it exists, but why should we pay $200 for a feature that may already be in the ECM we already own?

Originally posted by kaffine krazed

I've asked STAR about it and they said there was no way to change the idle speed for pto use. They said the PTO wire only disabled some of the OBDII monitors but they didn't know wich ones. They have been wrong before though.

Tell you what, PM me Star's number and I'll give them a call. There's a particular individual there that I want to contact to see what answers I can get from them. I have tried to get this information out of several DC reps, but they keep spewing the same old "printed from the manual" crap (as if I can't read). Although, when pressed, they can't tell me either, what functions it does disable.



So to answer the restated question, I don't think this has gone anywhere. At least, not from my end.

 

[emjay]

Ok, sorry for the misunderstanding. If you give up and want a "Radio Shack" solution, PM me. I think it can be done for under $25US.

 

[pcarlson]

I had Dodge here check with STAR and I checked with the local Cummins dealer about the PTO feature. They both said that Dodge didn't buy that program and no one could put it in because the memory in our ECM's wasn't big enough. My wire doesn't work because the program isn't there therefore no idle up and no bypassing OBD II programs.



I have been using the PS High Idler for two years now and that seems to be the best option out there.



My . 02.

 

[Red Rocket]

Persistence

I have the OEM high idler working, on nights below 30, it'll idle up in the morning all on its own(remote start), I got a quickcheck 2 cause I had the software checked in the summer, and wanted to check all of the sensors to see why it might not engage(Not much faith in D/C techs). Sure enough, with the right person at a dodge facility,and some cold weather, it works.



Nick

 

[mhenon]

I'm a new TDR member but wanted to make a comment on the subject. For whatever it's worth, I had an one time high idle on my pick-up (about 5000 miles on the rig). It occured after towing all day at high altitude in New Mexico. When I pulled into the trailer park for the night the idle was up around 1100 RPM. I assumed it was a computer glitch and shut the rig off. When it was re-started the next day the idle was right back to normal.

Apparently a high idle can be activated but I have no idea how to do it on purpose. It never happened again.

This is my first diesel pick-up and I don't think I'll ever buy another gas engine .

 

[dartos]

Broadway did not know anythig about the PTO high idle. I got the high idle flash but have not been able to see if it works. Has not been cold enough in Denver.



Pcarlson, I guess if the Cummins Rep said that dodge did not purchace that option it seem most likely that it would be a lost cause.

I hate to give up!