TSB150089-102020

New Backflow Connector for the Bosch® Aftertreatment Diesel Exhaust Fluid (DEF) Do... Page 1 of 6
Technical Service Bulletin
Technical Service Bulletin:
Released Date: 23-Oct-2017
TSB150089
New Backflow Connector for the Bosch® Aftertreatment Diesel Exhaust
Fluid (DEF) Dosing Unit.
New Backflow Connector for the Bosch®
Aftertreatment Diesel Exhaust Fluid (DEF)
Dosing Unit.
Core Issue
In some cases the aftertreatment Diesel Exhaust Fluid (DEF) dosing lines are not being
fully purged during the purge cycle.
This can result in internal cracking of the aftertreatment DEF dosing unit and leakage of
DEF. A revised backflow connector for the Bosch® aftertreatment DEF dosing unit has
been released. The revised backflow connector will help to fully purge DEF from the DEF
dosing lines and aftertreatment DEF dosing unit during the purge cycle.
Confirmation
Product Affected
Table 1, Product Affected
Engine Model Name
Engine Control System
Identifier
CM2350
B101
CM2250
Not Applicable
CM2250
Not Applicable
CM2250
Not Applicable
CM2350
L101, L111
ISX12
CM2350
X102
ISX12/ISX11.9
CM2250
Not Applicable
ISX15
CM2250
Not Applicable
ISB6.7
ISC
ISL9
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Table 1, Product Affected
Engine Model Name
Engine Control System
Identifier
CM2350
X101
QSF3.8*
CM2350
F107
QSB4.5*
CM2350
B106
QSB6.7*
CM2350
B105
QSL9*
CM2350
L102
*Off-higway
Resolution
The existing aftertreatment DEF dosing unit, Part Numbers 2871879 and 2871880 and
existing backflow connector, Part Number 2888180, have been obsoleted.
Aftertreatment DEF dosing units will be released as two different part numbers, one with
the revised backflow connector and one with the existing backflow connector. The
revised temporary backflow connector can be distinguished by the laser mark around the
base. The revised final backflow connector is red in color for ease of identification. See
Figure 2 for examples of each connector.
The location of the aftertreatment DEF dosing unit varies by OEM. Not all OEMs will
require the revised backflow connector.
For removal and installation instructions of the revised backflow connector. See
procedure 011-058 Aftertreatment Diesel Exhaust Fluid Dosing Unit in section 11 in the
corresponding service manual.
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New Backflow Connector for the Bosch® Aftertreatment Diesel Exhaust Fluid (DEF) Do... Page 3 of 6
Figure 1, Revised Backflow Connector, Part Number 4387302, Installed in the
Aftertreatment DEF Dosing Unit
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Figure 2, Backflow Connectors From Left: Existing Design, Temporary Revised Design,
Final Revised Design
Service Instructions
Scenario 1: If the unit is not an Original Equipment Manufacturer (OEM) listed in Table 2
below and only the backflow connector does not meet reuse guidelines.
Scenario 1 Resolution: The revised backflow connector, Part Number 4387302 must be
used.
Scenario 2: If the unit is not an OEM listed in Table 2 below and the aftertreatment DEF
dosing unit does not meet reuse guidelines.
Scenario 2 Resolution: The aftertreatment DEF dosing unit, Part Number 4387304 or
4387305, with revised backflow connector must be used.
Scenario 3: If the unit is one of the OEMs listed below in Table 2 and only the backflow
connector does not meet reuse guidelines.
Scenario 3 Resolution: The existing backflow connector, Part Number 4387659, must be
used.
Scenario 4: If the unit is one of the OEMs listed below in Table 2 or is operating in
China and the aftertreatment DEF dosing unit does not meet reuse guidelines.
Scenario 4 Resolution: The aftertreatment DEF dosing unit, Part Number 4387657 or
4387658, with existing backflow connector must be used.
 CAUTION 
Off-highway units listed above with ECM calibration codes after 1 December 2015
must have the revised backflow connector installed or damage to the DEF dosing
system can occur.
Reference Table 3 and 4 below for full part descriptions.
Table 2, OEM Name
Autocar llc
KME
Newell
Seagrave
Tiffin
Emergency
One
Linkbelt
Nova Bus
Spartan
Motors Inc.
Van Hool
Ferrara
Lodal Inc.
Oshkosh
Sutphen
Grove
MCI
Pierce
TEMSA
HME
NABI
Rosenbauer
Terex
Service Part Availability
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Service Parts are avaiable. See Tables 3, 4, and 5 below
Aftertreatment DEF Dosing Unit Identification:
• Voltage rating (12 volt or 24 volt) is stamped into housing of DEF dosing unit next to
electrical connection.
• Gray electrical connector face on electrical harness indicates a 24 volt unit.
• Back electrical connector face on electrical harness indicates a 12 volt unit.
• Electrical connectors are keyed differently and are not interchangeable.
Table 3, Revised Backflow Connector and Aftertreatment DEF Dosing Units With
Revised Backflow Connector
Part Description
Part Number
Backflow Connector
4387302
Supply Module 12 VDC
4387304
Supply Module 24 VDC
4387305
Table 4, Existing Backflow Connector and Aftertreatment DEF Dosing Units With
Existing Backflow Connector
Part Description
Part Number
Backflow Connector
4387659
Supply Module 12 VDC
4387657
Supply Module 24 VDC
4387658
Table 5, Obsolete Backflow Connector and Obsolete Aftertreatment DEF Dosing
Units
Part Description
Part Number
Backflow Connector
2888180
Supply Module 12 VDC
2871879
Supply Module 24 VDC
2871880
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.
Document History
Date
Details
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Date
Details
2015-6-4
Module Created
2015-11-3
Non-Product Problem Solving (PPS)
2016-2-5
Added Figure 2. Added caution.
2017-6-14
Removed reference to TRP1732.
2017-10-20
Added condition of operating in China to Scenario 4. Added
Aftertreatment DEF Dosing Unit Identification section to
Service Part Availability section.
Last Modified: 23-Oct-2017
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