IK1200921 ­ N9/N10/N13 Aftertreatment Private Data Link Troubleshooting

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IK1200921

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ISIS, FleetISIS

Revision:

9

Major System:
Current
Language:

ENGINES

Created:
Last
Modified:

6/18/2013

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Author:

10/2/2014
Will (Mark)
Wiley

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Title : N9/N10/N13 Aftertreatment Private Data Link Troubleshooting
Applies To : EPA 2010 Navistar N13 Engine EPA 2014 Navistar N9/N10 Engine

CHANGE LOG
DO NOT delete the CHANGE LOG
Updated : 09/26/14 ­ Added N9/N10 information

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Description
When troubleshooting this system it's important to know the difference between PRIVATE and PUBLIC 1939 datalink 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
datalink and NOT the PUBLIC 1939. Components that are on the private datalink only will not show as a detected module when using any
diagnostic tool.
Another key is the ACM is on both the private and the public datalink communicating on both to the ECM. If the ACM shows up on the
Helios, Intune or ServiceMaxx 1939 sniffer, then the ACM is communicating on the public 1939. The ACM will show as Source Address 85
For troubleshooting the Public datalink, refer to IK0800080 ‐ Data Link Troubleshooting.

N13 SCR Datalink Wiring Diagram
N9/10 SCR Datalink Wiring Diagram
Faults
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.
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.

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IK1200921 ­ N9/N10/N13 Aftertreatment Private Data Link Troubleshooting

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◦ 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.
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.
N13 Circuit

N9/N10 Circuit

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IK1200921 ­ N9/N10/N13 Aftertreatment Private Data Link Troubleshooting

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Copyright © 2014 Navistar, Inc.

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