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International DEF Sensor

Discussion in 'International Forum' started by Vincent5309, Jul 2, 2021.

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ChuckMartel Light Load Member

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avgdzlmekanic said: ↑

Ok, so on Thursday 9/23/21 I calibrated the ECM from HD10301 to HD10688. All codes went away except for the 3 you mentioned. We let the truck run on Friday and the driver notified me that day that the check engine light came on and SCR LVL 1 showed up on the dash with a derate at 20%. I asked if the truck felt derated and he said it didn't. So I figured this came up because it was an effect of the 3 codes (3868, 4572, and 4677). I told him to keep running the truck and we'll look at it when he got back. Truck didn't run over the weekend or Monday. It did run Tuesday showing the same thing on the dash when the driver started his day. In the middle of his day, he said the truck showed SCR LVL 2 on the dash and a derate of 40%. When this showed up, so did the red engine light and he wasn't able to drive past 5mph. I went out to the driver and new codes logged other than the 3 were 6254, 6255, and 3712. I couldn't figure out why the SCR was having issues because the codes said they were informational derate codes. So after doing some searching on the internet, I found a post that said the ECM could just need to be recalibrated again to get rid of the codes. So I recalibrated it a second time. After the recalibration, all the check engine lights were gone, the SCR LVL 2 notification was gone and only the 3 codes (3868, 4572, and 4677) stayed. So I figured the recalibration fixed it. Driver used the truck for the rest of his day without issues. Yesterday, the driver started to have issues again with the SCR and it wouldn't let him drive past 5mph. so I went out to him and recalibrated the ECM again. This time, after calibration, all the codes were gone except for the 3, but the SCR LVL 2 message stayed on the dash with a continuous beeping. However, there weren't any check engine lights and his power was back. So he finished his day and we downed the unit until we can figure out what is going on. Every time that I went out to these drivers, I made sure I physically checked the level of the DEF and it wasn't anywhere near empty. Any input would be greatly appreciated! Thank you!
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The calibration change itself doesn’t have a 100% success rate at this point in dealing with the SCR derates. Think they’re working on it.

ChuckMartel, Oct 2, 2021

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Heavyd Road Train Member

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Ok, couple of things; Like Chuck mentioned, Cummins is updating their list of calibrations all the time, so recheck if the new calibration has been updated with a new revision number. Remember, Cummins has to rewrite literally hundreds of these files. The other thing I would try is to isolate the ECM on the datalink by making sure nothing else is communicating when you program it in addition to making sure you have a battery charger connected to ensure battery voltage is 13 volts or higher to prevent data corruption. I did check, that new calibration is correct for the one you listed. What is the engine serial number?

Heavyd, Oct 2, 2021

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avgdzlmekanic Light Load Member

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How do I know if the calibration was updated? Also, what do you mean isolate the ECM? As in disconnect the body controller? The ESN is 80114622. Thanks for your fast response!

avgdzlmekanic, Oct 2, 2021

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avgdzlmekanic Light Load Member

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avgdzlmekanic said: ↑

How do I know if the calibration was updated? Also, what do you mean isolate the ECM? As in disconnect the body controller? The ESN is 80114622. Thanks for your fast response!
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@Heavyd

avgdzlmekanic, Oct 2, 2021

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Ideally, you only want the ECM communicating on the datalink. So the other modules need to be powered down for best results. What I do is remove the ignition fuse for the ECM and then jump power to it so only the engine will come on. I disconnect cab power at the firewall to disable the body controller and cluster. At that point, if you check the datalink with a sniffer, only the engine shows up.

To check Cummins calibrations for updates, log into Cummins Quickserve, on the left hand side column find "My Applications" and expand it. In the list is "ECM Calibration Revisions". Click that and then you can enter your calibration and do a search. It will list all the revisions and what their update does. The decimal point after the calibration is the revision number. That HD10688 still shows revision .00.

Heavyd, Oct 2, 2021

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avgdzlmekanic Light Load Member

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Ok awesome. So is this SCR issue an effect from the DEF header codes?

avgdzlmekanic, Oct 2, 2021

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avgdzlmekanic said: ↑

Ok awesome. So is this SCR issue an effect from the DEF header codes?
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@Heavyd

avgdzlmekanic, Oct 2, 2021

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Yes, those are all inducement codes triggered from the original three codes which the new calibration is suppose to prevent.

Heavyd, Oct 2, 2021

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avgdzlmekanic Light Load Member

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Heavyd said: ↑

Yes, those are all inducement codes triggered from the original three codes which the new calibration is suppose to prevent.
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Gotcha! Thanks for the help and quick responses @Heavyd

avgdzlmekanic, Oct 2, 2021

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