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I have a 2011 Blue Bird bus with a 6.7 Cummins engine. I get…

I have a 2011...

I have a 2011 Blue Bird bus with a 6.7 Cummins engine. I get codes 4094-31, nox limits exceeded due to insufficient regent quality, and 4364-18 aftertreatment 1 scr catalyst conversion efficiency. I have drained and replaced the def fluid. After clearing the codes, they will reset after approximately 45 minutes of driving time.

Mechanic's Assistant: What is the complete model and serial number of your machine?

2011 Blur Bird Vision. Body number f422883. I do not have the serial number in front of me

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Answered in 4 minutes by:
11/2/2018
Technician: cumminsdr, Mechanic replied 3 years ago
cumminsdr
cumminsdr, Mechanic
Category: Medium and Heavy Trucks
Satisfied Customers: 4,463
Experience: All types of Cummins applications
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What is the engine serial number?

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Customer reply replied 3 years ago
73164748I would rather type
Technician: cumminsdr, Mechanic replied 3 years ago

Thank You let me take a look and gather some info.

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Technician: cumminsdr, Mechanic replied 3 years ago

Thank You below are the faults you have and possible causes. I looked at the ecm updates and there are several updated that address both these fault codes. I would start with having Cummins Update your ecm and see if the codes come back then dig into the faults. You would need the Cummins Insite program to properly troubleshoot and monitor data. BZ90024.39 is the current update revision.Please take a moment to Rate/Accept my service

Fault Code: 3582
PID(P):
SPN: 4364
FMI: 18
Lamp: Amber

Aftertreatment SCR Catalyst Conversion Efficiency - Data Valid But Below Normal Operating Range - Moderately Severe Level. NOx conversion across the SCR catalyst is too low.

None on performance.

Possible causes of this fault code include:

  • Malfunctioning diesel exhaust fluid (DEF) dosing system
  • Exhaust system leaks
  • Malfunctioning SCR catalyst
  • Degraded, diluted, or incorrect DEF
  • Diesel exhaust fluid deposits in decomposition tube.
  • ECM calibration update

Fault Code: 3543
PID(P): S115
SPN: 4094
FMI: 31

Lamp: Amber

NOx Limits Exceeded Due to Insufficient Reagent Quality - Condition Exists. The diesel exhaust fluid quality is not sufficient enough to provide adequate mono-nitrogen oxides (NOx) reduction.

Possible engine power derate. Vehicle speed may also be limited.

Troubleshoot all other active NOx sensor and SCR dosing system related fault codes before this fault.

The SCR control system is able to detect when anything other than pure diesel exhaust fluid (DEF) is in the diesel exhaust fluid tank.

Possible causes of this fault include:

  • Malfunctioning diesel exhaust fluid dosing system
  • Exhaust system leaks
  • Malfunctioning SCR catalyst
  • Degraded, diluted, or incorrect diesel exhaust fluid
  • Diesel exhaust fluid deposits in decomposition tube.
cumminsdr
cumminsdr, Mechanic
Category: Medium and Heavy Trucks
Satisfied Customers: 4,463
Experience: All types of Cummins applications
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