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My truck does not want to run Driver was unloading at the…

Hello my truck does not...
Hello my truck does not want to runDriver was unloading at the warehouse and he was getting ready to leave and now the truck don’t want to runThis is the codes that the compusieron show Can i get some help?TxId: 0 SPN: 1569 – Engine Protection Torque Derate FMI: 31 Count: 32
TxId: 0 SPN: 5246 – Aftertreatment SCR Operator Inducement Severity FMI: 0 (High—most severe) Count: 4
TxId: 0 SPN: 3226 – Aftertreatment 1 Outlet NOx FMI: 20 (Data Drifted High) Count: 3
TxId: 0 SPN: 3364 – Aftertreatment 1 Diesel Exhaust Fluid Tank Quality FMI: 9 (Abnormal Update Rate) Count: 45
TxId: 0 SPN: 1761 – Aftertreatment 1 Diesel Exhaust Fluid Tank Level FMI: 9 (Abnormal Update Rate) Count: 42
TxId: 0 SPN: 3031 – Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature FMI: 9 (Abnormal Update Rate) Count: 1
TxId: 0 SPN: 4794 – Aftertreatment 1 SCR System Missing FMI: 31 Count: 1
TxId: 0 SPN: 4364 – Aftertreatment 1 SCR Conversion Efficiency FMI: 31 Count: 1
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Answered in 1 hour by:
6/12/2021
Technician: Andrew G., Heavy Truck Mechanic replied 1 year ago
Andrew G.
Andrew G., Heavy Truck Mechanic
Category: Medium and Heavy Trucks
Satisfied Customers: 79
Experience: Expert
Verified

Hi, ma name is*****'m sorry to hear about your problem. I'll do may best to assist you in finding best way to deal with this issue. Can you please tell me what brand is the truck and what engine in it? Preferably you may include the truck serial number and engine serial number

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Customer reply replied 1 year ago
Kenworth 2017
Isx Cumming
Vin#*****************
Technician: Andrew G., Heavy Truck Mechanic replied 1 year ago

Thank you. Let see what info I can dig out. Please give me some time as I will be reviewing information before giving you any advice. Do you have the engine serial number handy?

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Technician: Andrew G., Heavy Truck Mechanic replied 1 year ago

Never mind the engine serial number. I got it. Give me a moment.

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Customer reply replied 1 year ago
Perfect
Technician: Andrew G., Heavy Truck Mechanic replied 1 year ago

So it appears that your truck is suffering from two different conditions.

1. This is the most immediate issue that probably is causing most of the derate. It has communication codes for the DEF level/temperature sensor which is mounted inside the DEF tank. It is a smart device that communicates with the engine ECM via two wires CAN network. There are more devices hooked up to this network and none of them are reporting communication issues so it looks like the wiring is OK. Therefore my best guess is that the sensor itself has failed.

2. The other problem is presented by other codes that indicate low SCR conversion efficiency. This can be caused by several different failures such as:

a) DEF system failure (the above level sensor code will not cause this) - Dosing not enough DEF into the exhaust

b) DEF quality/concentration incorrect

c) excessive DEF deposits in the decomposition tube or even in the SCR catalyst

d) NOx sensor failure

Now given that there is also a code for "outlet NOx sensor data irrational drifted high" there is good chance that this is a outlet NOx sensor failure. However even that code can be caused by excessive DEF deposits in the exhaust.

The bot***** *****ne is: most likely if you change the DEF level sensor the codes derating it so severely should clear up almost right away and the truck might be drivable enough to get it to the shop. You still might have some derate due to other SCR efficiency codes.

If you want to give it a shot and replace outlet NOx sensor you can do so but there is no guarantee that it will fix it. To be sure it needs to be troubleshot eliminating other possible causes. Just keep in mind that these codes will not disappear instantaneously after repairing the issue but after some driving, unless you use diagnostic tool to clear them.

Please let me know if it all is clear and if you need any more explanation.

Thank you

Andrew G.
Andrew G., Heavy Truck Mechanic
Category: Medium and Heavy Trucks
Satisfied Customers: 79
Experience: Expert
Verified
Andrew G. and 87 other Medium and Heavy Trucks Specialists are ready to help you
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Customer reply replied 1 year ago
Clean like the water , thank you so much for your help
We will check on it
Technician: Andrew G., Heavy Truck Mechanic replied 1 year ago

No problem. I hope the truck gets on its way soon. If you are satisfied with my assistance, please take a moment and leave your feedback. And don't hesitate to reach back to me if you have any more questions.

Thanks

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