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Old 10-06-2021, 11:54 PM   #61
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Here is the correct link to the plug that matches the S2 chassis.

https://defsim.myervin.com/dss-conne...er-chassis-xcm
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Old 10-07-2021, 10:00 AM   #62
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Here is the correct link to the plug that matches the S2 chassis.

https://defsim.myervin.com/dss-conne...er-chassis-xcm
You are awesome. Thank you sir
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Old 10-07-2021, 12:10 PM   #63
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Just curious what year is your rig and how many miles on it ?
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Old 10-07-2021, 02:07 PM   #64
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Just curious what year is your rig and how many miles on it ?
Mine is a 2018.5. Had minor codes that cleared at about 10k, then codes at 17k and it went in and coolant lines were reversed and they replaced the DEF Header. I am now at 23k driven in extreme temps and the system has been fine. I installed the valve in case I see DEF temps rising on my Bluefire monitor for no reason which could mean a DEF Heater coolant valve failure which has the same effect as reversed line, in this case I can just shut the coolant flow off. I built the DEF simulator for insurance in case of a def header failure I wonít have to deal with a derate or be stranded someplace waiting for help.
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Old 10-07-2021, 05:47 PM   #65
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Built, tested, and tucked away hoping I never need to use it
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Old 10-08-2021, 06:38 AM   #66
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I seen where you posted this on facebook first,,
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Old 10-08-2021, 09:00 AM   #67
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Built, tested, and tucked away hoping I never need to use it
Just curious, did you test it via USB or did you plug it into your rig and let it run for a little?
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Old 10-08-2021, 11:09 AM   #68
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I seen where you posted this on facebook first,,

Only by about 15 minutes I work alphabetically.
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Old 10-08-2021, 11:24 AM   #69
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Just curious, did you test it via USB or did you plug it into your rig and let it run for a little?

Once the board is programmed and assembled you test that everything is working by plugging it into a computer and make sure it powers up and the LEDs are flashing. When I asked the developers how you test it, this is their reply.

"First go over your wiring, preferably with an ohmmeter, checking for any shorts between any of the 4 wires. Double check your connector wiring and verify that itís all correct. Make sure your vehicle ignition is off and then unplug your good OEM sensor and plug the DSS in its place. Turn on the ignition but donít start the engine. Note that the DEF gauge reads 75% regardless of what the actual level really is. Wait a full 5 minutes while watching the instrument panel for any lights or fault codes. If there are none, start the engine and let it idle for 5 minutes and watch for any faults or lights. Assuming no errors in the wiring it should be an utterly boring 10 minutes. If everything goes OK then shut the ignition off and re-connect the OEM sensor, put your DSS away someplace where you can find it and hope you never have to plug it in again.


If something goes awry and you do get any faults (and if there is a wiring problem the faults will not even necessarily be DEF sensor faults. They could be anything on the network like NOx sensors or turbo actuators) donít panic. Just shut it down, reconnect the OEM sensor and deliberately (take your time-donít be in a hurry) start the engine, let it fast-idle for a little over 5 minutes and shut it down. Repeat this sequence for 3 times total and on the 4th key-on all codes should be reset. You can also use a scanner device but it may not clear the 3031 code and youíll still have to do the engine run cycles anyway so you might as well just do it instead of messing with a code reader or scanner.



Obviously then go back to the bench and figure out what isnít right and correct it, then test again. We have never seen one not work unless there was a wiring mistake."
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Old 10-09-2021, 07:26 AM   #70
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are all these plugs the same on the newer models
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Old 10-09-2021, 09:09 AM   #71
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are all these plugs the same on the newer models

The plug on our Freightliners are different than the original build shows, using the DT-4 connector. Freightliner uses the TE plug and you have to make up the plug, there is not a pigtail that anybody has found. The DEF Sim page now has info on the Freightliner plug with part numbers. I found all the part numbers available from Mouser Electronics.



https://defsim.myervin.com/dss-conne...er-chassis-xcm
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Old 10-12-2021, 02:12 PM   #72
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What have you engineered now?

I picked the wrong couple of weeks to go fishing in Alaska! Cummin's corporate attorney finally wrote back and said that the company response would be to only add the bypass software IF you were at a freightliner or Cummins site and your needed part was "out of stock"! Some solution!

I can only guess that this DSS that you appear to have engineered is a DEF software bypass? Wow. Name your price and put me on the list, I'll buy one.

Also, you noted that you added a shut off ball valve on the DEF line coming off the engine. When would it be advisable to shut off the flow?

Sorry to be so simple, but I would like to use my RV and presently I don't have the confidence to head out on the road, considering my 3 DEF breakdowns.

Thanks in advance,

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Carmel, IN
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Old 10-13-2021, 08:47 PM   #73
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Does your FCAR F507 allow you to clear the DEF codes, or just identify them? Are the codes expressed in numerical form or words? If the codes are numerical, do they coincide with Cummins' codes?

thanks,
Damian Neeld
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Old 10-13-2021, 09:40 PM   #74
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I can only guess that this DSS that you appear to have engineered is a DEF software bypass? Wow. Name your price and put me on the list, I'll buy one.

Also, you noted that you added a shut off ball valve on the DEF line coming off the engine. When would it be advisable to shut off the flow?

Sorry to be so simple, but I would like to use my RV and presently I don't have the confidence to head out on the road, considering my 3 DEF breakdowns.
First off, I didnít come up with the DSS build and software, it was a great group of guys over on the IRV2 forum, this was developed for the Spartan chassis with the terrible Shaw DEF header but was found to also work on the one Freightliner uses. What is does is just simulate a DEF header by telling the ECU that everything is fine, basically the same way the Cummins patch does. The DEF system still operates as normal AND YOU STILL HAVE TO KEEP THE DEF tank full and keep track as the software will show the tank at 75% full all the time with the DSS or Cummins patch.

The second component that can fail is the DEF Heater control valve which has the same effect as the reversed cooling line by over heating the DEF tank. I monitor the DEF temp on my Bluefire monitor and have a warming set at 120 degrees, if this warning goes off, it could be a sign the valve has failed and I can manually shut the flow off before it starts cooking the DEF HeaderÖÖdamage starts occurring at 140 degrees or higher.

You may have the reversed coolant line issue if you have had problems 3 times. Have you ever contacted FCCC when you have issues or just went to a Freightliner shop? FCCC has the info to make sure to check for reversed lines and some shops are not replacing the Header and FCCC is making them swap it out.
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Old 10-13-2021, 10:08 PM   #75
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Yes, after initially buying this unit and bringing it back from Florida, I read your forum post about the reversed coolant hoses. I called FCCC and went to the freightliner dealer to have them check and they said my was correct, and they went ahead and changed out the pump bracket on the factory recall. I physically helped a John Deere ag technician drop the def tank and replace the header, boy that was a bear for an old guy like me. Since then we've replaced the dosing valve and the def pump itself. My wife is so gun shy and tired of being stranded, that she won't plan any trips until we get this nonsense fixed. Seriously, would you consider building another DEF sensor simulator? I have MS and my finger dexterity isn't what it used to be. Or is someone else is building them, send me a link. I need to get one if possible. As always, thanks in advance for your help and consideration. I told Jayco they should call you!
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Old 10-19-2021, 04:40 PM   #76
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Built, tested, and tucked away hoping I never need to use it
Had (still have) a bad DEF header, been waiting over 2 months on the part (told Q1 of next year, yes I understand I can find one on eBay but it's all still under warranty), and been waiting over a month on my ESN to be put on the Cummins TRP list.

All that said I installed my DSS last weekend and all my codes are are gone and no more derate!
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