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

[FAllen]

Just curious.



Has anyone tried the PTO sense switch input on the ECM yet ?



Fred

 

[thepitts]

Any news

Any update on this yet?

 

[Gizmo 007]

Had a little downtime at work today so I decided to test it.



I found the PTO wire (which is orange on my truck) and tested it. The wire has 5 volts as long as the key is on. Ok, so, do we put a load in-line with it, or ground it, or what? I called dodge, but they don't even know what PTO stands for (surprise, surprise ) so they're not much help.



Any electronics gurus out there care to chime in? I'll try anything, but I really don't feel like replacing a computer right now.

 

[Mad Max]

Sorta...

Giz is right, the Lead for the PTO switch is an orange wire, with a large white flag "PTO".



To quote the bible:



"When the aftermarket PTO switch has been engaged, a 12V+signal is sent through circuit G113 to PCM pin A13. The PCM will then sense and determine that the PTO has been activated"



I shoved a pin into the wire and tested it for current with a circuit tester in KOEO (key on engine off) and did not see any evidence of current, BUT I MAY NOT HAVE COMPLETELY PIERCED THE WIRE.



I'm talking with my local Dodge guy and he knows of the function for use with snow plows. (but all the plows I found for the rams use electric hydraulic pumps, not PTO driven?)



I'm going to have him set the programing for me, then test it by first grounding the PTO lead, and if that doesn't work, then I'll think about sending a (fused) + charge through it.



Still working on it though.



MaX

 

[Gizmo 007]

DON'T GROUND IT!!!! All you'll get is a light show! And Max, you're right, the engine has to be running, sorry.



Here's what I came up with --

An aftermarket switch is added to the circuit. One post is connected to a +12 volt source. The other post is connected to the PTO wire. When you flip the switch, the PTO lead goes from +5 volts, to +12 volts. This tells the computer to activate the PTO.



This came from the "guru" at my local dealership. It sounds logical. Then I asked "So, if I roast the computer, you're going to buy me another one, right?" He just got really quiet and gave me the oddest look #ad
.



I'm going to try it tommorrow (Saturday). I'll report back. If it cooks something, I'll let you know really fast.

 

[jboehm]

Thanks for the update Giz, sounds feasable, just don't fry your computer!

 

[zstroken]

Did it work

Did it work?? IF it does I am gonna set mine up to a temp and parkingbrake detect. If the temp is below XXX and the parking brake is on it will go to high idle

 

[EShaw]

Gizmo 007,

Well?... ... ... ..... The suspense is killing me... ... ..... did it work?

I hope this gets whipped before the cold weather sets in... ...

Eric

 

[Mark_Kendrick]

Well???? come on... . inquiring minds want to know

 

[jboehm]

What's with the deal with the parking brake? On an auto transmission?... BTW, maybe that's part of it. ??? Cause I couldn't find a "tagged PTO" wire on mine...



Come on guys, let's get with it!<G> I still think it should be able to be linked to the cruise control, on the auto trannys. . It's getting close to a bad winter season here in the midwest, and I need a warm(er) truck !!!! without p###ing my neighbors off at 4. 30 AM on the long warmup...

 

[Gizmo 007]

Sorry it took so long. Work's been killing me.



Ok, enough suspense. 12 volts IS THE TRICK ! It works! YOu'll have to get the PTO speed setting increased at the stealership. Mine only ramped up to 950 RPMS when I applied 12 volts. I had it reset today at the dealership to 1250 RPMs. WooHoo, now we have something!

 

[FAllen]

EXCELLENT !



Thanks Gizmo Oo.

 

[Texas Diesel]

woooohoooo!!!!!!!!!!



Party time, excellent!!!!!



Good job!!!!!!









Where is the PTO sense wire??

 

[Snow man]

. Thank you !!!!!!!!!!!!!!!!!!! I think 1/2 the guys on this site will have this feature working within the week. I know i will Thanks again Gizmo

 

[Philip]

Good job of finding this.



Where is the end of this wire located at. Is it in the engine compartment or under the dash?

 

[Michael Hughes]

#ad

 

[jerrethomas]

come on there gizmo, give us some more in depth details on the high idle. lol i've been looking for a high idle since i got the truck, knew there should be a way to do it but didn't know how. props to you!!!!!!

 

[Philip]

Thank you.



This sould make my brother in law happy. To bad my old first gen doesn't have this option.

 

[Oxjockey]

That's where mine is. The tag that says PTO is wedged between the loom and the shelf of the firewall.



Bryan

 

[HoleshotHolset]

I know... I'm on the 'wrong side'... but I'll ask anyhow just for clarification purposes... .



Feed this wire (low-amp fused) 12VDC + and everything is happy?

Very cool!



Matt