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davidjurss · 03-12-2020, **(Subject: Engine fan wont turn off )**

(03-12-2020 )Chamberpains Wrote: If you have the inline adapter, Insite is all over the internet. Most of the time its pirated and posted for free. Maybe someone from here will PM you some direction on where to pickup a copy of it. That way when you get your laptop you can be ready to get on top of this problem.

Matter of fact, someone did. It's exactly what I've been looking for.

Chamberpains · 03-12-2020, **(Subject: Engine fan wont turn off )**

As you will find, we're quite the helpful group of people and this site Rawze put together is an enormous mountain of information You may take a bit of a beating getting there. But that's only to focus you on what's important. Hopefully whoever helped you also pointed you in the direction of getting the other program to get your ECM programming pulled so it can be checked for safety and reliability.

Please let us know what you find with wrong with your engine fan. We have more help to offer as you get more information and who knows, what you find wrong may help someone else down the road that reads this.

davidjurss · 03-19-2020, **(Subject: Engine fan wont turn off )**

So I got Insite 7.6.2 installed, but the keygen wont give me the passcode. Keeps giving me an unknown error message. Guess I'll have to hunt around for it.

davidjurss · 03-19-2020, **(Subject: Engine fan wont turn off )**

Finally got Insite working, and noticed I had an amber warning for the fan control circuit. I started looking at wiring, but it started raining and I put it up for the night. Was able to run a few tests though, and happened upon this.

JimT · 03-21-2020, **(Subject: Engine fan wont turn off )**

That picture you posted is nice for finding intermittent problems, but if something is constantly reporting an incorrect value then it might not be noticeable there. Even still, 5.17v for the ambient air sensor seems off as they are usually in the 0-5v range. That could be the issue, either a bad sensor or wire on that circuit.

See Rawze's earlier post about ambient air temp bug with 870's.

Pull up Data Monitor and see what values the sensors are reporting. You can also see there what reason the ECM has for operating the engine fan. If the ambient air temp is reporting maximum high temp then the ECM might think it needs to run the fan to prevent over heating?

Also, what fault code was showing for the fan control and was it active or inactive? 1 count or many counts? recent or old? It may have been corrected by something you already replaced.

davidjurss · 03-26-2020, **(Subject: Engine fan wont turn off )**

Code that I pulled was 2377 Fan Control Circuit Voltage Above Normal or Shorted to High Source, but it's been a couple of days since I pulled it, so I can't remember if it was active or not. I do, however, remember that it showed as amber next to the code. I have the program on my laptop, but stupid me left it at home. It's not something I normally carry, so I missed it on my rounds of getting everything together to go back to work.

Jimbob · 03-30-2020, **(Subject: Engine fan wont turn off )**

Intake temp sensor. I had the same
Problem a month ago. You dont need
Insite if you own a volvo. Go to diagnostic in the dash it tells you everything

amermextrucker · 03-30-2020, **(Subject: Engine fan wont turn off )**

Had that same problem , but not on a EGR engine. Chased it for a couple of months , replaced , AC pressure switches , fan clutch solenoid , Coolant temp sensor i got tired of messing with it an ended up taking it to Freightliner in Elmhurst , Illinois. Ended up being a rotted cable in main harness that goes from solenoid to ECM. Parts was $10.00 and labor and diagnostic was $ 490.00 . LOL.

Chamberpains · 03-31-2020, **(Subject: Engine fan wont turn off )**

(03-30-2020 )amermextrucker Wrote: Ended up being a rotted cable in main harness that goes from solenoid to ECM. Parts was $10.00 and labor and diagnostic was $ 490.00 . LOL.

There is no way I'd LOL at that price. I'd be pissed. I would kick myself in the ass so hard to learn how they diagnosed this problem so I would NEVER pay someone $500 to fix a wire.

Some help in future situations for guys that want to learn is to have Cummins Insite or what ever diagnostic software you need. If you dont have it, spend the money, do the research and go get it. The next step is to see what sensor or circuit is failing or not reading correctly. Then finding the steps to test the sensor or circuit. For Cummins (and why Cummins is the best to own) https://quickserve.cummins.com/info/index.html is free and will have the troubleshooting trees for most diagnostic procedures to find if its the sensor or circuit and what to replace or repair. And the last tid bit I can give is if it's not the sensor or solenoid and points to wiring, then don't be afraid to physically grab the wires, cut the zip ties loose, pull the loom off and keep chasing those wires searching for rubbed points, broken, exposed or bulged wires, bad, corroded, poorly connected or pushed back pins in connectors.

When I worked for a dealership years ago, I'd get trucks that guys would spend multiple 8 hr shifts (which the customer would pay for that time) trying all kinds of diagnostic acrobatics "trying" to find intermittent or on going problems only to shrug their shoulders and say nothing is wrong or they give up. Never even looking at physical wires or plugs or only looking in the easy spots to get to. Then to have me get head long in to it by ripping the harness out and physical search the wires and find it was rubbed or visibly bad somewhere hard to get or just wasn't looked at.

Doing this style of physical searching also usually reveals A LOT of other problems or potential problems that can be fixed. It's usually never bad to get dirty and climb all over your equipment like a snake. It gets you more familiar with your equipment and that is priceless information for the next problem that is bound to happen.