TSB140013-012514

ISL G and ISX12 G: Fault Codes 124, 125, 556, 1861, 1965, 1966, 2722, 2723, 2758, 275... Page 1 of 2
Technical Service
Bulletin Number
Revision Level
Date
Group Number
TSB140013
QuickServe Online
Cummins Inc.
Technical Service Bulletin
Subject
ISL G and ISX12 G: Fault Codes 124, 125, 556, 1861, 1965, 1966, 2722, 2723, 2758, 2759,
2776, and 2991 While Operating in Temperatures Below Freezing 0°C [32°F]
Issue
Condensation forms in the charge-air cooler, exhaust gas recirculation (EGR) cooler and/or
blowby gases, freezes and causes poor performance and/or Fault Codes 124, 125, 556,
1861, 1965, 1966, 2722, 2723, 2758, 2759, 2776, and 2991.
Verification
Check the fault code snapshots in the job image to verify fault codes logged when the
turbocharger compressor intake air temperature was below or near 0°C [32°F]. If fault codes
occurred recently, inspect components for signs of ice or water.
Resolution
When operating engines in low ambient temperatures, care must be taken to make sure that
temperatures in the intake system are kept above freezing 0°C [32°F]. Condensation created
in the charge-air cooler and the EGR system can freeze in the intake if the intake air
temperature is below freezing.
The amount of condensation created in the charge-air cooler can be reduced and the
charge-air cooler outlet temperature can be increased by reducing the efficiency of the
charge-air cooler. Charge-air cooler efficiency can be reduced by blocking air flow across
the cooler and making sure the cooling fan is operating correctly. Care must be taken to
make sure there is sufficient flow across the radiator and the charge-air cooler. If blocking air
flow through the charge-air cooler is not sufficient to increase the intake manifold
temperatures above freezing, other measures must be taken to increase the air intake
temperature, such as pulling in warm engine compartment air into the intake of the engine.
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ISL G and ISX12 G: Fault Codes 124, 125, 556, 1861, 1965, 1966, 2722, 2723, 2758, 275... Page 2 of 2
These measures must be designed so they can be removedwhen sustained ambient
temperatures are above freezing.
Condensation from blowby can also form in the crankcase breather and the crankcase
pressure sensor on the ISX12. Insulating the breather and the breather hoses can increase
the temperatures inside the breather and help prevent freezing. Cummins® Part Number
2878268, tube insulation, is available.
Condensation can also collect in the boost reference line and the back side of the low
pressure regulator and freeze. This condensation freezes when trucks are parked in
subfreezing temperatures. The ice limits the travel of the low pressure regulator and can
cause low fuel pressure and fuel flow faults. When the ice thaws the low pressure regulator
will resume normal operation. Allowing the engine to reach operating temperatures before
operating the engine under load will allow time for the ice to thaw.
For additional details on preparing engines for cold weather operation, reference Operation
of Automotive Natural Gas Engines in Cold Climates, Bulletin 4332709.
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.
Attachments
Click here to see photos.pdf
Document History
Date
2014-1-24
2014-1-25
Details
Module Created
Fix an outfile
Last Modified: 27-Jan-2014
Copyright © 2000-2010 Cummins Inc. All rights reserved.
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