How do I get the 3 cyl High Idle Cold start activated on my truck? Is it something that has to be programmed in at the dealer?

 

Your truck should have it in the ECM already. It has to be pretty cold and about 6 conditions need to be met in order for it to operate. Try searching Cold start/high idle. There are some previous posts on here explaining everything.

Kurt

 

Many don't come from the factory with it installed.
Easiest way to get it is to borrow a Smarty. The Smarty will reprogram the ECM with the High Idle and will leave it there after you return your CTD to stock, and return the Smarty.

Dealers charge around $35.00 to re flash the ECM. Start a post asking for someone nesar you....buy them lunch and make a new friend! Cheaper.

But you may have it already. Parameters are very precise and must be meet exactly.
http://dodgeram.info/tsb/2001/18-019-01.htm
If you have the 1200 rpm high idle....you also have the 3 cyl idle.
"Additionally, if Intake Manifold Temperature (IMT) is less than -9°C (15°F), and all of the parameters above are met, three of the cylinders will be shut off upon reaching 1200 rpm, creating a slight change in engine sound which is normal. This allows the engine to create increased heat in the cooling system, allowing more rapid engine warm up and cab heating."
RJ

 

"slight change in engine sound" first time mine went to 3 cylinder idle I wasn't sure if I should shut it off or run.

 

2002 should just have to go to the dealer and have it turned on. My dealer did it for free. It only took about 10 min.

 

Is there anyway to raise the temp limit on air intake. I would like to see it come on at about 0C

 

Not unless your like Marco (from Smarty) and can massage the ECM.

RJ

 

My mistake. Just stumbled on this...from another thread. Just what 'Robert78.5' is looking for, from Timbo, the inventor of the lower cost APPS sensor replacement!
https://www.dieseltruckresource.com/...4&postcount=81

RJ