1998 cummins 5.9 24v having problems with po113 code, cannot erase, IAT sensor reads -40 in live data. That reading dose not change if i unplug the sensor, leave it plugged in, or put a jumper in the IAT plug, it reads -40 no matter what. I am pulling 4.8v on my multimeter at the IAT plug with both test leads in connector. I put a 2.7k ohm resistor in IAT plug and i can clear the po113 code and run truck, forcing IAT to read around 114. How ever something is forcing the truck into high idle and then what i believe to be 3 cyl high idle.  It dose this if i run truck without resistor in and check engine light on to. I have checked continuity on both IAT conector wires back through ecm plug, along with the wires for the CTS and MAP sensor. They all tested good when i ohm tested them. I have also replaced the IAT sensor CTS and MAP sensor. I pulled IAT sensor and check resistance on it and it seemed good still as the reading dropped when i put heat to it with blow dryer. I also took alternator to local Oreillys and had it bench tested 6 times and it passed every time, (i knew for sure it was charging but thought maybe bad diode.) Also have to brand new batteries, and have researched ground locations and cleaned every single one to shinny metal.The truck also has smarty but programmed to stock, along with edge juice with aditude which is completely disconnected. However before i disconnected it completely it said the ecm was getting 14.2 volts with truck running is that normal? Also the truck has a high idle kit of some sort installed but it works fine, actuator type mounted under throttle housing. It only allows high idle at 1200 rpm and works fine whe. Engaged and dis engaged. I have run out of ideas any input would be greatly appreciated.

Oops i meant check engine light stays off with my old Ecm after clearing codes, but i think the 3cyl high idle is engaging when it shouldn’t be 

Totally based on IAT temperatures. If IAT is reporting 15F or less then 3 CYL mode will start.

Yeah my IAT was in the 40s and 3 cyl high idle was still engaged/engaging 

Something is wrong with that ECM it shouldn't be enabling high idle unless the IAT is under +15*F. Any error codes?

Once i changed my IAT sensor connector i was able to clear the po113 high input code with no return. But my old ecm was still acting funny engaging high idle when it was to warm for it. I am thinking between the bad sensor connector and all the electrical diag i did that i damaged the ecm somewhere along the line. I put in a different ecm and i hadn’t no codes and was idling properly. My smarty would not communicate with the new ecm though, so i emailed Bob Wagner @smarty power, and he sent me a recovery software, and i successfully recovered the new ecm and smarty will now communicate. So everything appears to be functioning normal now, headaches are gone for time being. The recovery file he sent me is equivalent to a stock dealer flash and will work on 98.5-01 trucks so I’m pretty stoked on that software! Also Bob informed me that the 98.8-99 trucks had a weak flash memory in the ecms and that if i have problems with this new ecm tonfind a 00-01 ecm which have stronger flash memory to my understanding. I would like to thank you Moparman and all the other members on this forum for helping me get to the bottom of my electrical bug! Thank you! Cummins is purring like a kitten!

12 minutes ago, JP907ATB said:

so i emailed Bob Wagner @smarty power, and he sent me a recovery software, and i successfully recovered the new ecm and smarty will now communicate.

 

FYI... The actual Smarty support site is SmartyResource.com. They also do VIN unlock and recovery files as well. 

https://smartyresource.com/support/

 

Glad you got it figured out. I have heard Bob say that before about the early ECM's and that explains to me why the majority of ECM failures I read about are on early model trucks. Was Bob saying that an 01 ECM could be flashed to work on a 98.5-99 truck?

14 hours ago, dave110 said:

Glad you got it figured out. I have heard Bob say that before about the early ECM's and that explains to me why the majority of ECM failures I read about are on early model trucks. Was Bob saying that an 01 ECM could be flashed to work on a 98.5-99 truck?

 

It sure can. 00, 01, or 01.5 are the prefered ECM's. You can get ahold of me on our support system @ www.smartyresource.com

with the truck information and I can have my programmer build the truck specific recovery software to allow using a different ECM..

Thanks You! My spare ECM is from a 99 truck so it would be plug & play if I ever need it. I may look for a newer model now that I know it's possible to use.

Quick question... if i engage my manual high idle, it’s set just about 1200rpm would it be bad to turn on me pac brake to help warm up?

Indeed let me know Dave. On the Smarty site www.smartyresource.com

you will see the support tab so you can designate the ticket to recovery. I watch those pretty close and unless I am in the shop or in a conference I will jump right on it pretty quick..

 

Thank you!

 

Edited January 17, 20187 yr by BrianAtSmarty

2 hours ago, JP907ATB said:

Quick question... if i engage my manual high idle, it’s set just about 1200rpm would it be bad to turn on me pac brake to help warm up?

 

6 CYL you fine go for it. 

 

3 CYL watch the EGT's it might get too hot with 3 CYL and exhaust brake on. I typically see right at 900*F on 3 CYL mode.

Edited January 17, 20187 yr by Mopar1973Man

Okay thanks, yeah i haven’t unlocked 3cyl on my new ecm yet, with smarty. I’m just staying stock right now to make sure all my bugs are gone before i mess with ecm programming. And regular high idle Dosent seem to do much as far as getting up to operating temp and staying there. 

2 hours ago, JP907ATB said:

Quick question... if i engage my manual high idle, it’s set just about 1200rpm would it be bad to turn on me pac brake to help warm up?

You should be fine I've done it and many others, @Mopar1973Man I believe that is the idea behind it 

Edit , ignore my post my phone didn't show me all the replies right away

1 hour ago, JP907ATB said:

And regular high idle

How are you getting that to turn on, wife ecm is not enabled. With quad?

Edited January 18, 20187 yr by Dieselfuture

26 minutes ago, Dieselfuture said:

You should be fine I've done it and many others, @Mopar1973Man I believe that is the idea behind it 

Edit , ignore my post my phone didn't show me all the replies right away

How are you getting that to turn on, wife ecm is not enabled. With quad?

I don’t understand what your asking?

I don’t know about quadzilla but i know with smarty if you program a tube, and then program back to stock it unlocks high idle(6cyl) and 3cyl high idle. I haven’t done that to my new ecm yet, but i have a little switch wires to a little deal under the throttle body that will hold the throttle open at set amount rpm. It is not strong enough to push the throttle by itself, so i have to flip the switch and tap the throttle and it will then Hold at 1200rpm

2 minutes ago, JP907ATB said:

I don’t understand what your asking?

Yeah sorry about that I'm using speak to text on my phone it's retarded, I was wondering how you turning on your high idle if your ECM is not enabled