No. For the Diesel (manual trans [any rpm] or auto trans [higher than 1200]), the Solid Orange wire receives a signal 12v to initiate the high idle. The resistor is connected between PTO_VREF (Orange with Red tracer) and PTO_RPM (Orange with Yellow tracer).

For the Gas without a PTO, it appears by the schematic that the resistor goes between the Solid Orange and the Orange with Yellow tracer.

It seems from the schematic, that the gas & diesel PCM circuits differ in what is used as the reference voltage. The diesel uses a 5v ref and the gas uses 12v but is reduced by a circuit of additional resistors in the PCM. Actually, looking at the resistor charts, that is exactly what is going on looking at the voltage column.

Anyway, that is probably more than one needs to know.

Jim

 

Just a thought, why not use a 500 ohm resistor and a 50k pot (in series) in place of the fixed resistor for adjustable speed control?

 

Basically, we are just tricking the computer into thinking that we have installed a PTO. The only thing I am not sure of is if the 03's and 04's have the necessary wiring without the PTO provision, as I have only performed this while actually installing PTO's and have not tried it on my 04 without the PTO provision. Tomorrow, I am going to check the instructions for installing a PTO (brand names not needed b/c all are the same wiring connections) and then check my truck for the wires and hook it up. I will let you all know tomorrow night whether my 04 has the wires if no one else answers before I get to it. Also, I agree with crash687 that we could use a variable pot and resistor as a variable control. I am not sure if I can mention a company name here, so I will refrain. On many large trucks with Cat, Cummins and INTERNATIONAL engines, we install a Module that intercepts the stock "cab" throttle potentiometer output and a second "remote" throttle potentiometer output and a simple toggle switch alternates which one is sent to the ECM. I have not seen one that is compatible with a Ford PSD, but this idea would certainly work if all of the inputs/ outputs were transferred through the module. Tomorrow, I will call the manufacturer that we get these from and ask them if they make something for PSD's. Wow, now I've got something to do other than work tomorrow. Gotta go, sorry for the long post, I just started typing what I was thinking.

 

So on my 05 diesel with 6 speed I connected the orange wire to upfitter switch 4 per instructions. I followed the insturctions to engage AIC. And nothing, no idle increase. Checked with a test light and there is power to orange wire. Is there a fuse for the pto? Is there more to this than connecting 2 wires? Thanks for any info.

 

See my message a couple above yours. The manual trans requires a resistor.

 

I was told that with the right switch you could step the throttle a few times on the '05. The Field Service Rep mentioned something about a potentiometer. I wonder if an LED readout could be hooked inline so you would know what step you are on.

 

There are a lot of things you can do. A pot, a rotary switch with a specific rpm resistor, a stepper switch, a solid state switch circuit, etc. I'd guess the best readout would be... the tach?

I'm also guessing that the PCM is smart enough to attempt to maintain the designated rpm under a varying load range.

Jim

 

On IH and KWs (at least some models), you can actually use the cruise control to idle up when sitting still - with or without the PTO.

Jim

 

Now we're all talking of a fixed idel at 1200 rpm. Is that the best idle for a pto? Or should we be going higher, 1260 or 1320 rpm for example?

 

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You probably should contact the vendor of whatever is connected to the PTO and see if there happens to be a max rpm for the PTO itself.

Some new rollback trucks I have seen kick the idle up on demand - run the winch or deck and the engine idles up - controls back to neutral and the engine returns to normal idle. Pretty slick...

Jim

 

THANKS JIM!!!!! Nice post.

Mike

 

Darn it. I was all set to post a question about why, when starting my 6.0 the last few cold mornings, was my engine idle up close to 1000 rpms. Then i get on this site and you guys deprive me of the chance to ask a valid question about my beloved oil burner. No wonder I keep getting that note at the top of the page that Mr. T is going to inflict pain on me for not posting. You guys always beat me to it. KEEP IT UP!!!

Big

 

OK, as promised I did set up my '04 Friday, but couldn't get on here to tell you all about it. Anyhow.... mine does NOT have the orange wire as the '05's do. The '04 uses a blue wire w/ yellow stripe as an input to allow throttle controls. When installing a PTO, a supplied relay closes the circuit between this wire and a signal input from the white wire w/ light blue stripe from the Body Builder customer access wires above the throttle pedal. This wire is the only loose wire hanging out of this bundle so it is very obvious, also the bundle is marked "customer access wires (see body builder book for instructions)". The blue wire w/ yellow stripe is a little harder to identify because there is a green wire w/ yellow or white stripe just beside of it coming from the same bundle. This bundle is immediately above the parking brake and also contains the customer access wires that pass through the firewall, so be sure to get the blue wire with the yellow stripe ONLY. When installing a PTO, like I said, a relay connects these two circuits when the PTO switch is turned on. However, all of our trucks have the wires and programming just not the hole in the tranny. If you use a simple toggle switch to close this circuit and have all other requirements met; park brake set, foot off brake and throttle, trans. in neutral, etc.... then turning this switch on will set your engine RPM's at 1200. So, I know this looks like alot, but really it took me all of 8 minutes and most of that was switch install and wire connecting. If I could post attachments I would give you some pictures, but alas I cannot. Hope this makes it easier and answers questions for us '04/'03 guys. Mat

 

Oh, one more thing, I found a strange set of plugs above the parking brake that I cannot ID. There are three plugs, one looks kinda like an old printer plug, flat and narrow, it connects to a wire bundle with two inline spade fuses. The other two are very small slightly similar to the little plugins on the front of my home computer (can't remember what they are called) Does anyone know what these are for????? If you think you know, but need a pic PM me and I'll send you a picture since I can't add attachments here. Thanks for any info. Mat