NHTSA ID Number: 10117156
Manufacturer Communication Number: IK1200921
TSB/Document Date: 2017-09-08
Summary
Aftertreatment Private Data Link Troubleshooting
IK1200921 ISX, N13, and N9 / N10 Aftertreatment Private Data Link Troubleshooting
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Document
TOBAGO, UNITED
IK1200921
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Languages:
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Revision: 14
ENGINES
Created:
English
Last
5/17/2016
Modified:
NONE
Author:
Viewed:
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6/18/2013
Charles
Schroeder
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Title : ISX, N13, and N9 / N10 Aftertreatment Private Data Link
Troubleshooting
Applies To : 2010 Navistar
N13 Engine, 2015 Navistar N13 Engine, 2014
Navistar N9 / N10 Engine, 2012+ Cummins ISX Engine
Change Log
Dealers: Please refer to the change log text box below for recent changes to this article:
05/17/2016 ‐ Updated article title and applies to, stating Cummins ISX is also included.
01/06/2016 ‐ Updated the 6033 connector composite for better understanding of the connector
orientation based on dealer feedback.
10/22/2015 ‐ Author updated for Feedback purposes
06/08/2015 ‐ Updated connector composites for N13. Added private data link schematics
showing backbone routing.
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IK1200921 ISX, N13, and N9 / N10 Aftertreatment Private Data Link Troubleshooting
Page 2 of 10
Description
When troubleshooting this system it's important to know the difference between PRIVATE
and PUBLIC 1939 data link and how they are used with this system. The first thing to note is
the DEF sending unit, NH3, both NOx sensors, SCR Temp Sensor Module are on the PRIVATE
data link and NOT the PUBLIC 1939. Components that are on the private data link only will
not show as a detected module when using any diagnostic tool.
• The ACM communicates on both the Private and the Public data link with the ECM.
• If the ACM shows up on the Helios, Intune or ServiceMaxx J1939 sniffer, then the ACM
is communicating on the Public J1939.
• The ACM will show as Source Address 85
• The engine / aftertreatment private data link consists of engine and aftertreatment
modules communicating to each other.
◦ You cannot use a diagnostic tool to communicate with the private data link.
• Navistar engines have terminating resistors internal to the ECM and ACM
• Cummins engines have a terminating resistor internal to the VGT Actuator, and an
external terminating resistor
For troubleshooting the Public data link, refer to IK0800080 ‐ J1939 Data Link
Troubleshooting.
Diagnostic Trouble Codes
SPN
FMI
Description
3216
19
NOx IN not detected on J1939
4346
19
SCR Temp Sensor Module not Detected on J1939
3226
19
NOx OUT not Detected on J1939
1761
19
DEFTL not Detected on J1939
4360
19
SCR Temp Sensor Module not Detected on J1939
609
19
ACM not Detected on J1939
Service Procedure
Any Sensor or Module with 1939 faults, you must verify power/ground and ignition feeds to
that component. If each passes a load test, move forward with the below 1939 circuit test at
each suspect component with the complaint present.
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IK1200921 ISX, N13, and N9 / N10 Aftertreatment Private Data Link Troubleshooting
Page 3 of 10
Use the Navistar engine wiring schematic found in the Service Portal Master Service
Information page for the engine you are working on. For Cummins products, use the
electrical schematic book. The schematics below show the private data link only. They show
the various harnesses the data link is routed through and identifies the harnesses as
Navistar or Cummins harnesses.
• N13 Private Data Link Schematic
• N9 / N10 Private Data Link Schematic
• ISX Private Data Link Schematic
If the PDC cover behind the DEF Tank is removed, ensure the cover is reinstalled fully.
1. Check for datalink voltage + and ‐ at each sensor or module with the key on.
◦ You should have approximately 5v total when you add the voltages from each
wire together, i.e. 2.7v on one and 2.3v on the other.
◦ These 2 wires should not have exactly the same voltage on them. If they do, you
might have the 2 wires shorted together. Check the resistance between the 2
wires in Step 2 to be sure.
◦ If you get 0v or close to it on either wire, you probably have a short to ground on
that wire.
2. Check the resistance measuring across the + and ‐ terminals. (Batteries must be
disconnected)
◦ You should have approximately 60 ohms.
◦ If you get 0 ohms, then you have a short between the 2 wires.
◦ If you get 120 ohms, you have an open somewhere in the datalink or you're
missing one of the resistors.
◦ If you get 40 ohms, and extra terminating resistor has been added.
3. Check for short to ground. Check the resistance from + to ground and then – to
ground. (Batteries must be disconnected)
◦ Resistance should be greater than 1,000 ohms.
◦ If resistance is less than 1,000 ohms, then you have a short to ground.
Connector Composites
• The composites below were taken from an N13. Many of the connectors are used on
multiple chassis. The engine sensor harness is the main difference between the
different chassis types.
Private J1939 Data Link (CAN) Pin
out for Aftertreatment System
J1939
Pins
Connector View
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IK1200921 ISX, N13, and N9 / N10 Aftertreatment Private Data Link Troubleshooting
Page 4 of 10
(Private Data Link Only)
Module
Connector
Location
Pin Pin
(+) (‐)
DEF Harness Connectors *Navistar Harness
686
ACM ‐ J2
DEF
Tank
Level /
Temp
(58 Pin
Connector)
14 15
(+) (‐)
678
(4 Pin
Connector)
2 1(‐
(+) )
674 M
(20 Pin
Connector)
19 18
(+) (‐)
1 2(‐
(+) )
670 F
(12 Pin
Connector)
5 6(‐
(+) )
AFT Jumper Harness Connectors *Navistar Harness
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IK1200921 ISX, N13, and N9 / N10 Aftertreatment Private Data Link Troubleshooting
670 M
Page 5 of 10
1 2(‐
(+) )
(12 Pin
Connector)
5 6(‐
(+) )
7 8(‐
(+) )
671 F
(12 Pin
Connector)
11 12
(+) (‐)
672 F
(8 Pin
Connector)
1 2(‐
(+) )
DOC and DPF Harness Connectors *Cummins Harness
672 M
(8 Pin
Connector)
DOC / DPF
Temperature
Module
1 2(‐
(+) )
3 2(‐
(+) )
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IK1200921 ISX, N13, and N9 / N10 Aftertreatment Private Data Link Troubleshooting
Page 6 of 10
(4 Pin
Connector)
SCR Harness Connectors *Cummins Harness
671 M
12 Pin
Connector
NOx Out
Sensor
Module
7 8(‐
(+) )
11 12
(+) (‐)
3 2(‐
(+) )
4 Pin
Connector
SCR
Temperature
Sensor
Module
3 2(‐
(+) )
4 Pin
Connector
2 3(‐
(+) )
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IK1200921 ISX, N13, and N9 / N10 Aftertreatment Private Data Link Troubleshooting
Page 7 of 10
Ammonia
(NH3) Sensor
Module
4 Pin
Connector
Engine Chassis Harness *Navistar Harness
674
20 Pin
Connector
NOx In
Sensor
Module
19 18
(+) (‐)
608
4 Pin
Connector
Engine
Interface 6033
3 2(‐
(+) )
16 17
(+) (‐)
21 Pin
Connector
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IK1200921 ISX, N13, and N9 / N10 Aftertreatment Private Data Link Troubleshooting
Page 8 of 10
Engine Sensor Harness *Navistar Harness
6033
Engine
Interface 21 Pin
Connector
ECM ‐ E1
N13
16 17
(+) (‐)
96 Pin
Connector
E1 E1
‐ ‐
09 33
(+) (‐)
EGR Valve
Jumper
1 2(‐
(+) )
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IK1200921 ISX, N13, and N9 / N10 Aftertreatment Private Data Link Troubleshooting
Page 9 of 10
Harness
4 Pin
Connector
*2015‐
Newer N13
Only
EGR Valve Jumper Harness *Navistar Harness
EGR Valve
Jumper
Harness
4 Pin
Connector
1 2(‐
(+) )
*2015‐
Newer N13
Only
EGR Valve
4 Pin
Connector
1 2(‐
(+) )
*2015‐
Newer N13
Only
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Copyright © 2016 Navistar, Inc.
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TSB/Document ID: IK1200921
Replacement Service Bulletin Number:
MFR Communication Date: 2016-05-17
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Communication Type: Service Bulletin/Repair Instructions
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