This is awesome!

If you could write some code to re-program the fan engagement temperatures, you could make some really good money.

 

Thanks.

I know a bit about the cooling system. I've never heard of a need to change the fan turn-on temperature. In what circumstances would that be desirable?

 

What really is desirable will be subjective and may rightfully spark a good argument.

What has happened over the last decade or two, that many manufacturers have raised coolant temperatures to meet their emission and fuel economy targets. Former Daimler-Chrysler, now FCA is one of those companies.

While this practice might have been determined to be a perfectly safe, it puts the cooling system closer to it's limits and in my opinion rightfully raises valid concerns.

As a result many people including myself may wish to see their engines running cooler, however to this day the only way to accomplish this is via expensive tuning solutions. Coughing up hundreds of dollars is difficult, especially if all someone needs is to adjust the fan engagement temperature.

So if someone could come up with a different, more economical way to adjust fan engagement temperatures, then that could be a win for everyone.

It MUST be noted, that fan engagement is generally a well MISunderstood subject. People wrongfully think that fan is effectively used only under low speed operation. However that is wrong. Fan ASSIST is very real and is used even under high speed operations and this is exactly where reprogramming the fan engagement schedule of Pentastar might bring a solution to those who believe that Pentastar should benefit from cooler running temperatures.

So I can only encourage you trying to come up with a solution. I believe it can generate some healthy sales for you.

The only danger that I see for your 'investment', that some other low budget diagnostic scan manufacturer could in future include this function in their existing platform. E.g. I'm thinking about Appcar DiagFCA, that has received amended functions since it's initial release and now features a rather broad functionality.

Further, hopefully the fan tuning part will be accessible without having to unlock the ECM. I'm sure you know our ECMs are locked for tuning from 2016- on.

 

What really is desirable will be subjective and may rightfully spark a good argument.

What has happened over the last decade or two, that many manufacturers have raised coolant temperatures...

......

...Further, hopefully the fan tuning part will be accessible without having to unlock the ECM. I'm sure you know our ECMs are locked for tuning from 2016- on.

Well I'm not looking for an argument.

How much have they raised the coolant temperature? I don't see that it is close to a system limit.

I don't know but it seems that one couldn't just change the coolant temperature without perhaps having to adjust mixture too. Maybe the ECM would automatically do that, but I don't know.

I'm not looking for sales. (That would be like... work. I don't need that noise.) I posted this to help other and also hoping that others would contribute, thus helping us all.

I hadn't heard of the commercial programmer you mentioned. Looks pretty good. Reasonably priced. But still VIN-locked. I suspect that with time our community could come up with an open source equivalent.

 

Nicely done! :winner:

This is some next level sh!t.

 

Admitting being brand new to this "tuning" thing but why is there this level of involvement to accomplish the adjustment? Isn't this ability already available in a scroll and click form on my OBD JScan?

 

I suspect your JScan allows you to read all sorts of information from the vehicle but doesn't allow you to write settings - such as tire diameter, tire pressure limit, axle ratio, etc. - to the vehicle.

 

Thanks for the replies. Bob S how did you know I am "simple"


socal22 you have any Cherry 2000's laying around?

 

Sorry, I don't know what a Cherry 2000 is.

 

Well, I'm a happy user of JScan. It had a bit of a rough launch, but the developer worked out all of the issues in a timely manner and has done continued work to add improvements and new features.

He has recently added a Trail View, that allows you to engage front and rear lockers independently from the screen and show some other information. I haven't gotten to use that yet, but looking forward to giving it a try.

ben

 

I have used trail view and like it. The most recent update added swaybar disconnect. I’m happy with JScan for sure. Just today I updated my tire size to reflect my new pizza cutters.

 

Wow, tough crowd... As if these guys wouldn't trip over themselves to get their hands on a totally free option.

Personally I think it's cool you're digging into this and sharing your findings. (OSS dev here, for what it's worth, though I lack the time to commit to anything new... and I'd be terrified of bricking my Jeep.)

 

Thanks.

There have been a couple other threads on OBDII programming:
https://www.wranglerforum.com/f202/hacking-the-can-interior-bus-466730.html
https://www.wranglerforum.com/f202/hacking-the-obd-ii-diagnostic-port-1113194.html
dcgibbons did a lot of good work. I'm certainly open to cooperating with other developers.

Part of my motivation was also to put downward pressure on the prices of the commercial programmers. Originally I bought a commercial programmer for about $180. I knew that there was little more to them than there is to the cheap ELM327 interfaces. And then they are VIN-locked to one vehicle. We can do better than that.

Jscan is probably going to put downward price pressure on the market. We'll see if some of the prices decrease.

 

@socal22

Thumbs up from me too.
The more repair and programming options, the better.

And please rmember, I'm itching to change the fan engagement temperatures.

 

I'm gonna double down here and put this in the 2 JScan/OBD threads I know of to cast a broad net but -



Trying to change my transfer case ratio but when ever I try the Jeep won't accept the change. This is just using the first step. I get the screen saying my change was accepted but when I check it didn't take. I'm thinking there is 1 more step where I need to temporarily open the computer(?) to allow the change to be saved?


Sound familiar to anybody? I also thinking it is like when you change your axle gear ratio. You have to temporarily open the computer to allow the change to be saved? At least this is what the 1 youtube vid says,

​

Anybody.....anybody....


__________________
When young people tell me about their problems I like to tell them that story about the time I survived without my cell phone and the internet for 40 years

 

Hoping this thread is still active. Can anybody answer why some of these changes aren't taking with the JSCAN App? RHinorear is having trouble with his transfer case ratio settings, but I'm having trouble with the TPMS Threshold settings. I enter the change, hit "go" and get a successful message, but the change doesn't take. However if I turn *off* the TPMS monitor, that change takes. Any suggestions are welcome. Thanks

 

I have ALWAYS had trouble setting tpms and not just with jscan, but with procal and fashcal (I own all 3 devices)



They all claim success but when it comes down to it, they all fail.


In this example I use jsacn and I set for 151kpa (22psi) and you even see the change up above. You can't see it in the pic but but the left rear wheel is flashing low at 165kpa. The alarm isn't even supposed to be going off until 151!

The only thing which has ever really worked for me on all 3 devices is just turning it off.


Now I did notice Jscan just today put out a bug fix for tpms (evic version) which I will try later.... but if it works it'll be a first.


Some people DO have real success and I'm not sure why. I belive it has something to do with the later model jk's vs the earlier models (mine is a 2017)... but that's just a guess.

 

Have you perhaps mapped out the Modules to CID's?

 

Curious what JScan developer response is...Since I don't own JScan license.

 

I tried the new jscan tpms bug update, and same thing. It claims success.... but fails.


I'm just doing what I did last Winter.... turn it off.

 

Try it it might work I might be a simple country bumpkin but I have connections.

 

Okay.
I'll give it a shot tomorrow!

 

Say - just because I'm an idiot - what are the two versions for programming TPMS: Normal vs EVIC version??? Thanks in advance. Also, I'll try the new JSCAN release (11/10/19) tomorrow and report...

 

Yeah... that's quite interesting. I noticed Jscan has it divided up that way. Clearly they believe there is a difference.