TSB150068-051115

Fault Code 2722 Due to Low Pressure Regulator Housing Casting Defect
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Technical Service Bulletin Number
TSB150068
Technical Service Bulletin
Subject
Fault Code 2722 Due to Low Pressure Regulator Housing Casting Defect
Issue
Fault code 2722 logs during extended motoring conditions due to a low pressure regulator
housing casting defect. The casting defect is located in the low pressure regulator bore and
allows a small volume of fuel to pass around the low pressure regulator o-ring seal. During
extended motoring conditions this fuel can lead to fuel regulator outlet pressure exceeding the
fault code threshold.
Verification
Product Affected:


ISX12 G CM2180 EJ
Affected engines are before engine serial number (ESN) 75029933 or an engine build date of
09 June 2014.
Use INSITE™ electronic service tool to review the fault code snap shot for fault code 2722.
If fault code 2722 occurred with Fuel Control Valve Command at 0% and Percent Load at 0%,
inspect the low pressure regulator housing for a casting defect.
Remove the low pressure regulator. Use the following procedure in the ISX12 G CM2180 EJ
Service Manual, Bulletin 4310682. Refer to Procedure 005-047 in Section 5.
Inspect the low pressure regulator bore in the low pressure regulator housing for signs of
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Fault Code 2722 Due to Low Pressure Regulator Housing Casting Defect
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pitting. The pitting may appear to be dirt or debris, but can not be cleaned from the low
pressure regulator bore. See Figures 2 through 4.
Revisions to the low pressure regulator casting were implemented on 07 April 2014. Revision
changes include adding material to the low pressure regulator casting prior to machining.
Suspect low pressure regulator casting dates are prior to 097 14. Date code format is DDD YY.
097 14 is equivalent to the 97th day in 2014. See Figure 5.
Figure 1, New Low Pressure Regulator
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Fault Code 2722 Due to Low Pressure Regulator Housing Casting Defect
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Figure 2, Low Pressure Regulator Bore with Pitting
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Fault Code 2722 Due to Low Pressure Regulator Housing Casting Defect
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Figure 3, Low Pressure Regulator Bore with Pitting
Figure 4, Low Pressure Regulator Bore with Pitting
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Fault Code 2722 Due to Low Pressure Regulator Housing Casting Defect
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Figure 5, Low Pressure Regulator Date Code
Resolution
If pitting is found, replace the low pressure regulator housing. Use the following procedure in
the ISX12 G CM2180 EJ Service Manual, Bulletin 4310682. Refer to Procedure 005-238 in
Section 5.
Warranty Statement
The information in this document authorizes specific changes to the repair practice for failures
covered under product warranty coverages.
Document History
Date
2015-5-11
Details
Module Created
Last Modified: 15-May-2015
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6/2/2015