IK0800080 ­ J1939 Data Link Troubleshooting

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Document
IK0800080
ID:

Availability: ISIS, Bus ISIS, FleetISIS, Body Builder, IsSIR

Revision: 24

Major
System:

ELECTRICAL SYSTEM

Created:

English

Last
6/28/2017
Modified:

Current
Language:

Other
Portuguese, Français, Español,
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Viewed:

Author:

8/22/2007

Charles
Schroeder

108753
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Title : J1939 Data Link Troubleshooting
Applies To : All Models with 250k Baud Data Link (Black 9-Pin Diagnostic Connector); Overview information for
500k Baud Data Link

Change Log
Dealers: Please refer to the change log text box below for recent changes to this article:
06/28/2017 ‐ Added graphic to Step 1 for power and ground at diagnostic 9‐Pin connector based on dealer feedback.
04/27/2017 ‐ Updated diagnostic software to Navistar Engine Diagnostics™.
01/12/2017 ‐ Added French and Spanish translations.
01/04/2017 ‐ Added new sections for 500k Baud Vehicle Architecture: Phase 1 and Phase 2
11/17/2016 ‐ Updated Step 19 based on dealer feedback.
10/04/2016 ‐ Noted the troubleshooting cards in the article are the most current that are published. Noted when inspecting splice welds, visual





• This article is for general J1939 troubleshooting on 250k baud data link vehicles. They will have a black 9‐pin diagnostic connector. The
information provided applies to all models. Check the Fault Code Action Plan for the faults you are diagnosing, there may be model
specific FCAP diagnostic information available.
• You MUST review the "Service Information (Known Issues)" section of this iKNow article PRIOR to troubleshooting anything on the truck.

Click Here for a printable PDF version of this article.
Table of Contents
Description

Service Part(s) Information

500k Baud (Phase 1) Vehicle
Architecture

Symptom(s)

Additional Resources

500k Baud (Phase 2) Vehicle
Architecture

Special Tool(s) or
Software

Connector Views

Diagnostic Steps

Service Information (Known
Issues)

Description
There are a few things that you need to understand before troubleshooting the 1939 data link.
1. First, the drivetrain J1939 data link, J1939 body builder data link, and J1939 engine data link are three completely separate data links.
◦ For specific examples of modules on each different data link Click Here

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IK0800080 ­ J1939 Data Link Troubleshooting

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2. The different J1939 data links work the same way, but the wiring for them is not connected.
3. The troubleshooting below is geared towards the drive train J1939 data link, but the same principles apply to the body builder and engine
data link.
4. The J1939 data link consists of a twisted pair of yellow and green wires that all the modules on the truck use to communicate with each
other.
5. Two 120 ohm terminating resistors are wired in parallel on the data link. Total resistance on a properly working data link is 60 ohms.
6. When you are checking the data link, if the problem is not present, the data link will show good.
7. The J1939 data link may be referred to as data bus, or CAN as well.
8. A module is capable of being connected to the public and private data link, but the information remains separate.
◦ Example: The Body Controller communicates on the public drivetrain data link, but also has the private body builder data link wired
to it.
◦ Example: The EIM communicates on the drivetrain data link, but also communicates with the ECM and ACM on the engine private
data link.
The MaxxForce 7 TMV (Thermal Management Valve) is on the Public data link. This module will not show up on the sniffer.
The ECM Engine and Chassis connector's data link terminals are connected internally to the module.
E13 and C53 are internally connected. E14 and C54 are internally connected.
For Post‐2007 vehicle 1939 troubleshooting, click on the appropriate link below:
• The troubleshooting cards give a good overview of the data link. This will help show you the backbone of the data link (main data link
wiring between 1st terminating resistor to 2nd terminating resistor) and the stubs of the data link (wiring from the backbone to each
possible module)
Basic example of Public J1939 data link

• The J1939 Splice Adapters (1024, 1025, 1026) are part of the backbone of the data link (The backbone will come in on 2 terminals and
leave on 2 different terminals). The wiring from the connector to each module is a stub.
◦ HPV (medium duty) 1939 Troubleshooting Card
◦ CE / BE Bus 1939 Troubleshooting Card
◦ ProStar 1939 Troubleshooting Card

These cards are 11" x 17" so they may not print well on regular size paper.
There are the most current troubleshooting cards that are available for printing. For more information specific to ProStar and LoneStar refer to
the Data Link Service Procedure found in the 2010–2016 ProStar® Technician Manual 0000863170. If you wish to order the above cards, you
can order them through the Navistar Print Portal from the Service Portal ‐ Dealer Menu. The part numbers are:
Vehicle Model

Part Number

ProStar Card

S00153

DuraStar, TranStar & WorkStar Card

S00155

CE / BE Bus Card

S00154

( Back to Top )

Symptoms

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IK0800080 ­ J1939 Data Link Troubleshooting

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Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
SPN

FMI

Module and Source Address (SA)

Description

PRO100 0

Synthetic Fault Code

ProStar/LoneStar J1939 Fault Code Combination
Occurred

PRO100 1

Synthetic Fault Code

ProStar/LoneStar J1939 Fault Code Combination
Occurred

GEN100 0

Synthetic Fault Code

A combination of J1939 Fault Codes Occurred

GEN100 1

Synthetic Fault Code

A combination of J1939 Fault Codes Occurred

GEN100 2

Synthetic Fault Code

A combination of J1939 Fault Codes Occurred

639

9

Body Controller (33)

Drivetrain message timeout

639

14

Body Controller (33)

Drivetrain message timeout

2000

19

Body Controller (33)

PTC1 (PGN 64892) not Received from Engine

2023

9

Body Controller (33)

EGC data link communication failure

2000

9

Gauge Cluster (23) / Body Controller (33) Loss of data link from the Engine Controller

2003

9

Gauge Cluster (23) / Body Controller (33) Loss of data link from the Transmission Controller

2011

9

Gauge Cluster (23) / Body Controller (33) Loss of data link from the ABS Controller

2023

14

Gauge Cluster (23)

Gauge cluster lost communication with the ESC

2023

14

Gauge Cluster (23)

Gauge cluster lost communication with the Engine
Controller

2033

9

Gauge Cluster (23)

Loss of data link from the ESC

560

19

Engine (0)

Transmission driveline engaged not detected on J1939

609

19

Engine (0)

ACM not detected on J1939

639

14

Engine (0)

J1939 data link error (ECM unable to transmit)

639

19

Engine (0)

J1939 data link error (ECM unable to transmit)

751

8,11 Transmission (3)

J1939 Shift Control Device

563

9,14 Transmission (3)

ABS CAN Message

639

2

Transmission (3)

J1939 Communication Link

639

14

Transmission (3)

J1939 Engine Message

639

2

Anti‐Lock Brake System (ABS) (11)

Drivetrain message timeout

639

12

Anti‐Lock Brake System (ABS) (11)

J1939 Serial Link

639

14

Anti‐Lock Brake System (ABS) (11)

Loss of Data Link from Engine Controller

2853

14

Primary Shifter (5)

Drivetrain message timeout

886

14

Headway Controller (Forward Radar)
(40)

Drivetrain message timeout

Customer Complaint(s):
•
•
•
•

Gauges inoperative (Constant or Intermittent)
Transmission will not go into gear
Warning Lights
Check Electrical Message

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Special Tool(s) or Software
Tool Description

INTUNE

Tool Number

Comments

EZ‐Tech Software

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IK0800080 ­ J1939 Data Link Troubleshooting

Helios

EZ‐Tech Software

Diamond Logic Builder (DLB)

EZ‐Tech Software

Navistar Engine Diagnostics™

EZ‐Tech Software

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Fluke DVOM

ZTSE4357

Electrical Tester

ZTSE4858

Digital Multimeter

180‐Pin Breakout Box

00‐00956‐08

Breakout box allows for testing engine control module and body
control module systems

Breakout Harness Kit

Multiple

Use breakout harness that is applicable to the system you are
testing

Terminal Test Kit

ZTSE4435C

Kit, Int. Elec. Eng. Terminal Test

Terminal Test Kit

77066‐nav

Hickok Break‐Out Tee Builder And Pin‐Out Tool

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Diagnostic Steps

• The problem must be present when taking these readings!!
• If the problem is NOT present, the reading will be within spec every time!!
The diagnostic checks listed below can be performed at any module connector
• Making checks at each module connector can help isolate a voltage drop / increase in resistance / short to power or gound
• Use the worksheet below to identify which modules, connectors and terminals you have checked
Connector Terminal Worksheet
• This can also help identify if the J1939_High and J1939_Low wires are pinned incorrectly at a connector
• Due to the many configurations and options available, the terminating resistor can be found in multiple locations (250k only vehicles)
◦ Near the top of the transmission in the Powertrain Harness
◦ Left frame rail (could be as far forward as the steer tire in some applications) in the Center Chassis Harness
◦ Left frame rail (near the radiator bracket) in the Forward Chassis Harness (*if equipped with Forward Radar)
◦ Under the bunk in the sleeper (when factory pre‐wired for telematics)
◦ Near the ACM
• Be aware there are multiple data links on the truck. You must ensure the terminating resistor is part of the public drivetrain data link, and
not one of the private data links (body builder or engine/aftertreatment)
Step

Action

Decision

Yes: Continue to Step 2

1

No: Verify proper power and ground to the 9‐pin ATA diagnostic
connector
• Install a comm. device (Nexiq USB, NavCom, NavLink) the
Power LED should be illuminated.
• Install a scan tool.
Is the
• Turn
Power
theLED
ignition
illuminated?
key on, engine off (KOEO).
• Attempt to establish communication with INTUNE.

2

3

Yes: Obtain screen shot or record all modules. Continue to Step 3

Are you able to communicate with any of the modules?

No: Continue to Step 6

Note: Refer to IK0800351 to indentify the module to the source
address.
• Evaluate modules detected on the sniffer.

Yes:

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IK0800080 ­ J1939 Data Link Troubleshooting

Can you identify a module that is NOT communicating?

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• Check the fuse for that module.
• Load test the battery power, ignition power, ground circuits
at the module connector.
• If ALL power and ground circuits test okay, test the data link
circuits at that module connector using the information
starting at Step 6.
• Repair wiring as needed to allow the module to communicate