TSB140088-062314

Shorted or Open Selective Catalytic Reduction (SCR) Aftertreatment Wiring Harness Cau... Page 1 of 2
Technical Service
Bulletin Number
TSB140088
Revision Level
Date
Group Number
Technical Service Bulletin
Subject
Shorted or Open Selective Catalytic Reduction (SCR) Aftertreatment Wiring Harness Causing
Multiple Fault Codes on the J1939 Data Link
Issue
Shorted or open circuits in the Cummins Emission Solutions supplied SCR jumper wiring
harness can cause “timeout” errors in the SCR temperature sensor module, the outlet mononitrogen oxides (NOx) sensor module, or the NH3 sensor module.
1.
2.
3.
4.
5.
Early versions' connectors were missing wedgelocks, which led to bent connector pins.
Harness splices came apart.
Harness splice corrosion caused short circuits.
Improper heat shrinks on harness splices.
Supply wire gage not sufficient to support (carry) power draw (amperage).
Active or inactive counts of all or any combination the following Fault Codes: 285, 2636, 2771,
3232, 3911, 4151, 4152, 4159, 4572, and 4585 are normally associated with the SCR jumper
wiring harness malfunction. However, due to the different original equipment manufacturer
(OEM) vehicle configurations, there may be additional fault codes associated with this harness
malfunction.
Verification
Condition:
1. Turn Keyswitch OFF.
2. Disconnect the SCR wiring harness at the 12-pin connector (C1).
3. Disconnect the NOx sensor from the harness (C4).
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7/1/2014
Shorted or Open Selective Catalytic Reduction (SCR) Aftertreatment Wiring Harness Cau... Page 2 of 2
4. Disconnect the NH3 sensor from the harness (C3).
5. Disconnect the SCR temperature sensor module from the harness (C2).
Action:
1. Inspect the connector and pins for damage. Refer to Procedure 019-361 in Section 19.
2. Check for a short circuit to supply or ground in the SCR wiring harness. Refer to
Procedure 019-359 in Section 19.
3. Check for an open circuit the SCR wiring harness. Refer to Procedure 019-359 in Section
19.
4. Check for a pin-to-pin short circuit in the SCR wiring harness. Refer to Procedure 019359 in Section 19.
Connector
Terminal
To
Connector
Terminal
C1 (OEM)
10 (V+)
:
C2 (TEMP)
4 (V+)
C3 (NH3)
1 (V+)
:
C2 (TEMP)
4 (V+)
C4 (NOx)
1 (V+)
:
C2 (TEMP)
4 (V+)
Resolution
If damaged connector pins, an open circuit, a short circuit to power or ground, or a pin-to-pin
short is detected in the SCR wiring harness, replace the SCR wiring harness. Otherwise,
continue normal troubleshooting of the original fault code.
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
2014-6-23
Details
Module Created
Last Modified: 24-Jun-2014
Copyright © 2000-2010 Cummins Inc. All rights reserved.
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2014/tsb140088.html
7/1/2014