How to add manual high idle (PTO) LLY - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 11-14-2004, 09:37 PM   #1 (permalink)
Max Power
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Due to popular demand here are some pictures and notes of the manual high idle installation on my LLY. We use the PTO function of the ECM to allow us to set the idle up to 1150 RPM or 1700 RPM. Once installed you can press set on the cruise control button while the truck is in park and it will idle up to 1150 RPM. Resume will take you to 1700 RPM. Pressing the brake or shifting out of park will bring it down to normal idle.


First you need to Remove the 2 (10mm) bolts holding the PCM to allow easier access to the ECM.





Unplug the 2 connectors on the TCM and remove the TCM out of the way to give you more room to work.











Here is a picture of the ECM. You need to unplug the bottom of the 3 plugs. There is a tab holding the grey locking lever. You need to push in this tab and then pull the grey lever all the way back.





Then unplug the plug from the ECM.





Next you will need to remove the wire protector cover.





Here is what it will look like from the back side with the wire protector cover removed. You will need to remove the plug from terminal 6. They are marked so you need to count 6 from the marked number 1.





You will need to completely remove the pin lock from the other side of the plug. Make sure you notice which way it comes out so you put it back in the right way.








Next you need to crimp your end on to a wire. The wire should be around 22 gauge.











Next insert the pin into the the plug in the hole that you removed the wire plug from. Sorry I didn't get pictures of that.


Once you see it is snapped into place you should be able to see the pin inserted correctly from the other side. Then you need to reverse your steps. Put the pin lock back in, reinstall the wire cover, plug the connector back into the ecm, plug the wires back into the PCM, bolt the PCM back down.


Then you just need to run your wire into the cab. I recommend buying split loom to keep it looking factory.


Lastly you need to hook up the wire inside the cab. I recommend hooking it up to the brake switch for ease of use and a clean install. Solder it to the green/white wire on the brake switch. This wire is 12+ only when the brakes aren't depressed and the gear shift is in park. You could also wire this wire to a spst switch with the other wire on the switch going to a FUSED +12v or ignition source.








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Last edited by Max Power; 12-24-2004 at 05:37 PM.
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Old 11-14-2004, 10:05 PM   #2 (permalink)
Max Power
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One other thing. Every time you try to engage the high idle for the first time you will have to press set twice. One more push brings it down to normal idle. After the first time one press will idle it up to 1150 again.





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Old 11-14-2004, 10:39 PM   #3 (permalink)
IdahoSteve
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Amazing job Max!! Excellent!! Thanks a bunch!!
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Old 11-15-2004, 11:24 AM   #4 (permalink)
DuckhunterInTN
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Great job.


This needs to be a sticky.
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Old 11-15-2004, 01:01 PM   #5 (permalink)
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yes it does. I cant wait to get mine.
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Old 11-15-2004, 04:14 PM   #6 (permalink)
briano
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forgive my ignorance, but what is this high idle used for or what does it fix? I am new to diesels and am learning more and more.

thanks
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Old 11-15-2004, 04:55 PM   #7 (permalink)
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To aid in quicker warm up time. If you havent noticed, it will take a diesel about 3 times as long as a gasser to reach operating temp when its cool out.
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Old 11-15-2004, 10:04 PM   #8 (permalink)
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ok.. so most of you that are up north in the cold, this helps you guys out a lot then. cool
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Old 11-15-2004, 10:31 PM   #9 (permalink)
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What would putting the green wire onto the brake switch of a ZF-6 truck do? Does that wire on a ZF-6 only have power when the parking brake is depressed and no pedals are depressed? Also, if I chose to just wire it to a 12V source does that mean that i could engage the high idle anytime (like without parking brake on)?





BTW, Great write up, ive been waiting for someone to figure out how to do this with an LLY
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Old 11-15-2004, 10:32 PM   #10 (permalink)
Max Power
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Actually since the LLY has an automatic high idle this will help people in the 30-50 degree weather warm up their truck. The automatic high idle won't kick in at those temperatures and that is where this comes in handy.





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