TSB180047-060420

Aftertreatment Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
Page 1 of 9
Technical Service Bulletin
Technical Service Bulletin:
Released Date: 04-Jun-2018
TSB180047
Aftertreatment Diesel Exhaust Fluid Dosing Unit Heating Element
Discoloration
Aftertreatment Diesel Exhaust Fluid Dosing
Unit Heating Element Discoloration
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
•
•
•
•
•
•
•
•
B6.7 CM2350 B121B
L9 CM2350 L116B
X12 CM2350 X119B
X15 CM2350 X114B
X15 CM2350 X116B
QSK19 CM2350 K105
QSK50 CM2350 K108
QSK95 CM2350 K113
Issue
Symptom:
• Diesel exhaust fluid (DEF) dosing unit heater elements can be discolored caused by
chemical reactions between aluminum housing and DEF.
• DEF dosing valve inlet screen can become plugged with debris when corrosion on
the DEF dosing unit heating element flakes off.
• A plugged DEF dosing valve inlet screen will typically lead to FC1682, FC3574,
and/or FC3596.
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2018/tsb180047.html
7/2/2018
Aftertreatment Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
Page 2 of 9
Note : Additional DEF system related fault codes can be present.
Verification/Confirmation
Verify symptoms and/or listed Fault Codes are present.
Resolution
If DEF dosing valve inlet screen is found to be plugged with debris, and corrosion on
DEF dosing unit heating element is flaking off:
• DEF dosing unit and DEF dosing valve inlet screen must be replaced. DEF pressure
line, between DEF dosing unit and DEF dosing valve must be flushed with distilled
water to remove any residual debris.
• See Figure 1 for an example of a plugged DEF dosing valve inlet screen.
• See Figure 2 for an example of a DEF dosing unit heating element with corrosion
that is flaking off.
If DEF dosing valve inlet screen is not plugged with debris and there is corrosion on DEF
dosing unit heating element, but is not flaking off:
• Do not replace DEF dosing unit (for this condition). All DEF dosing units will have
some level of discoloration/corrosion internally.
• See Figure 3 for an example of a clean DEF dosing valve inlet screen.
• See Figures 4, 5, and 6 for examples of DEF dosing units with acceptable levels of
discoloration/corrosion.
Note : If DEF dosing valve inlet screen was removed from DEF dosing valve
during inspection, DEF dosing valve inlet screen must be replaced.
Part Identification
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2018/tsb180047.html
7/2/2018
Aftertreatment Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
Page 3 of 9
Figure 1, Plugged DEF Dosing Valve Inlet Screen.
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2018/tsb180047.html
7/2/2018
Aftertreatment Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
Page 4 of 9
Figure 2, Corroded DEF Dosing Unit Heating Element
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2018/tsb180047.html
7/2/2018
Aftertreatment Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
Page 5 of 9
Figure 3, Normal DEF Dosing Valve Inlet Screen.
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2018/tsb180047.html
7/2/2018
Aftertreatment Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
Page 6 of 9
Figure 4, Normal DEF Dosing Unit Heating Element Discoloration.
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2018/tsb180047.html
7/2/2018
Aftertreatment Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
Page 7 of 9
Figure 5, Normal DEF Dosing Unit Heating Element Discoloration.
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2018/tsb180047.html
7/2/2018
Aftertreatment Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
Page 8 of 9
Figure 6, Normal DEF Dosing Unit Heating Element Discoloration.
Affected UL2 DEF dosing unit parts numbers can be seen in Table 1:
Table 1: Affected DEF dosing unit part numbers
CES Part Number
EBU Part Number
A052Y605
4388105
A051F964
4377994
A047H782
4353810
A050G798
4377364
A055B124
5373865
A055B125
5373866
A057Y382
5375478
A057Y387
5375479
A057Y445
5375480
A057Y212
5375481
A057Y215
5375482
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2018/tsb180047.html
7/2/2018
Aftertreatment Diesel Exhaust Fluid Dosing Unit Heating Element Discoloration
Page 9 of 9
Document History
Date
Details
2018-4-13
Module Created
2018-6-1
Non-Product Problem Solving (PPS)
Last Modified: 04-Jun-2018
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2018/tsb180047.html
7/2/2018