TSB230065-032420

Additional Guidance for Misfire Fault Codes
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Technical Service Bulletin
Technical Service Bulletin:
Released Date: 24-Mar-2023
TSB230065
Additional Guidance for Misfire Fault Codes
Additional Guidance for Misfire Fault Codes
Warranty Statement
The information in this document has no effect on present warranty coverage or repair
practices, nor does it authorize TRP or Campaign actions.
Contents
Product Affected
• L9 CM2450 L126B
Issue Summary
Symptom:
• Misfire fault codes without any audible misfire or performance loss (false misfire):
Table 1, Misfire Fault Codes
Fault Code
Fault Description
5895
Engine Misfire Cylinder #1 - Root Cause
Not Known
5896
Engine Misfire Cylinder #2 - Root Cause
Not Known
5897
Engine Misfire Cylinder #3 - Root Cause
Not Known
5898
Engine Misfire Cylinder #4 - Root Cause
Not Known
5899
Engine Misfire Cylinder #5 - Root Cause
Not Known
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2023/tsb230065.html
4/4/2023
Additional Guidance for Misfire Fault Codes
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Table 1, Misfire Fault Codes
Fault Code
Fault Description
5911
Engine Misfire Cylinder #6 - Root Cause
Not Known
5914
Engine Misfire for Multiple Cylinders Root Cause Not Known
Root Cause:
• The misfire diagnostic can be overly sensitive in certain conditions in some
applications and can generate incorrect faults code. Running in PTO mode is
particularly sensitive to these fault codes.
Verification
• Verify that one or more of the listed fault codes are active or inactive with more than
one count within the last 25 engine operating hours.
• Verify there are no performance complaints with the unit.
• Run the injector performance test on the injectors. See corresponding Service
Manual. Reference Procedure 014-014 in Section 14..
Resolution
• Do not replace injectors unless injector performance test results say to replace
injector(s)
• Recommended to change the PTO speed to less than 2000 rpm if feasible.
Changing the PTO speed can clear the false fault condition.
◦ Run the vehicle in PTO mode to verify if the fault returns.
• Compare the ECM code and revision number in the ECM to the calibration revision
listed in the ECM Calibration Revision History Database on QuickServe® Online
(QSOL) for applicable changes. If an ECM calibration code update for this fault code
is available, the ECM calibration code revision must be that revision or higher.
• Operate the engine within the “Conditions for Clearing the Fault Code” found in the
Overview section of the troubleshooting procedure.
Document History
Date
2023-3-23
Details
Module Created
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2023/tsb230065.html
4/4/2023
Additional Guidance for Misfire Fault Codes
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Last Modified: 24-Mar-2023
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2023/tsb230065.html
4/4/2023