IK0800080

IK0800080 ­ 1939 Data Link Troubleshooting
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ELECTRICAL SYSTEM
Created:
8/22/2007
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6/16/2014
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Christopher
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Title : 1939 Data Link Troubleshooting
Applies To : All models
Change Log
Dealers: Please refer to the change log text box below for recent changes to this article:
06/06/2014 ­ New information of a possible failure found through the case file system has shown us a
pontential failure location. Refer to the new "Service Information" section


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.
2. They work the same way, but they are 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 drivetrain data link, but also has the 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 drivetrain data link is a Public data link which consists of any module that is present on the data link when you plug into the ATA diagnostic
connector.
• Examples:
ECM
Body Controller
TCM
Instrument Cluster
ABS
Collision Avoidance System (Wingman, OnGuard)
• The Body Builder data link is a Private data link which consists of modules communicating to each other. You cannot use a diagnostic tool to
communicate with them.
• Examples:
RPM
Sleeper HVAC
Remote Radio
• The Engine data link is a Private data link which consists of engine related modules communicating to each other. You cannot use a diagnostic
tool to communicate with them.
• Examples:
EPA07 MaxxForce 11 / 13
ECM
EPA10 N13 SCR
ECM
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IK0800080 ­ 1939 Data Link Troubleshooting
EIM
Page 2 of 11
ACM
ACM
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 legs of the data link (wiring from the backbone to each possible
module)
• The J1939 Splice Adapters (1024, 1025, 1026) are part of the backbone of the datalink (The backbone will come in on 2 terminals and leave on 2
different termials). The wiring from the connector to each module is a leg.
◦ 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.
If you wish to order the above cards, you can order them through the publications website and the part numbers are:
• ProStar Card ‐ S00153
• DuraStar, TranStar & WorkStar Card ‐ S00155
• CE / BE Bus Card ‐ S00154
Service Information ‐ Potential failure location based on case file information
• 6/9/2014 ‐ Recent information from the field has shown a potential failure location
• A poor connection on the splice the ties the ABS module into the Back‐bone of the data link was found on multiple units
◦ This splice is in the cab, and the harness is common between mutiple chassis and engine platforms
◦ At this time (6/9/2014) the earliest build date affected is 09/23/2013
◦ Possible DTCs
SPN
FMI
Module
Description
639
9
ECM
Drivetrain Message Timeout
639
9
Body Controller
J1939 Drivetrain Data Link Lost
2011
9
Body Controller
ABS Data Link Comm. Failure
2000
9
Body Controller
ECM Data Link Comm. Failure
2023
9
Body Controller
EGC Data Link Comm. Failure
2003
9
Body Controller
TCM Data Link Comm Failure
2000
19
Body Controller
PTC1 (PGN 64892) not received from Engine
2000
9
Instrument Cluster
Loss of Data Link from Engine Controller
2011
9
Instrument Cluster
Loss of Data Link from ABS Controller
2003
9
Instrument Cluster
Loss of Data Link from the Transmission Controller
2033
9
Instrument Cluster
Loss of Data Link from the ESC
• If you have these faults and the vehicle build date is near August 2013 or Newer you will need to troubleshoot this splice in the data link if no obvious
failures are found
• Follow the harness from the ABS module to the Data Link Backbone. Once you locate the splice, wiggle test that connection (also twist the spice in your
fingers) while monitoring the data link resistance. (If a resistance check does not show any fault, repeat this test monitoring data link voltage as well)
• Cab temperature was effecting the data link behavior in one of the vehicles found to have this issue
Crimp location: Right side of cab above the ABS module, next to the HVAC box. The condensation module (if installed) will be zip tied to or near the splice.
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IK0800080 ­ 1939 Data Link Troubleshooting
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Close view of crimp location
Harness removed from truck for identification
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IK0800080 ­ 1939 Data Link Troubleshooting
Page 4 of 11
Wire condition at crimp to ABS module
Wire condition at crimp to ABS module (2nd photo)
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IK0800080 ­ 1939 Data Link Troubleshooting
Page 5 of 11
Parts Information
Description
Part Number
Bulk Data Link Cable
3519281C2
Terminating Resistor
3519178C91
Service Procedure
• The problem must be present when taking these readings!!
• If the problem is NOT present, the reading will be within spec every time!!
1. Check for DTC's
◦ The ESC will log a code when it loses communication from other modules. So even if you're not having problems with the ESC you still need
to check the codes in the ESC.
◦ You also need to check the other modules for codes.
◦ If you can't get codes from anything, go on to step 2.
2. Hook up with INTUNE diagnostic software and run the "Sniffer" with the key on. Wiggle areas of the harness while watching to see if anything
falls off of the sniffer. You will need to get the unit up to temp. Sometimes the bad spots in the data link splices do not show up when the unit is
cold. If you cannot find Intune, go to the start button, programs, vehicle diagnostics, and then select Intune. Do not use the sniffer in Master
Diagnostics. The sniffer in Master Diagnostics only checks the 1708 data link.
◦ This will open a box and list every module with its source address that is communicating on the 1939 data link.
◦ If a module is not listed then it is not communicating on the 1939 data link.
◦ If only one module is missing in the "Sniffer" that module might not be powered up. You need to check the powers (battery and ignition)
and grounds to that module. Start by checking the fuses.
◦ If you are only missing one module and that module is powered up, you need to make checks 3 and 4 at that module. For example, if the
Body Controller does not show up in the "Sniffer", then you need to make your checks at pins 34 and 35 of the 1600 connector at the Body
Controller. Refer to the appropriate circuit diagram or the chart at the bottom this article for pin and connector numbers.
◦ If nothing shows up or you can't get connected (nothing is communicating), then you need to go to steps 3 thru 5.
◦ It is also normal for some modules like the compass module source address 28 to show up on the data link then fall off. Some modules
don't update fast enough and the "Sniffer" thinks it went back to sleep. If you see this issue, do not troubleshoot, you can de pin the
module and remove it from the data link so it won't show up and go away.
◦ For newer models 2010 and up, use the Helios sniffer to see what is on the data link. However when you using Helios once an item has
populated the window if it loses power or drops off the only way to tell is if the counter continues to advance. Please pay attention to that
when monitoring. The INTUNE sniffer will still work on the newer models as well.
3. Check voltage from pin C to ground and from pin D to ground at the ATA diagnostic connector with the key on.
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IK0800080 ­ 1939 Data Link Troubleshooting
Page 6 of 11
4. You should have approximately 5 volts total when you add the voltages from each wire together. For expamle 2.7v on C and 2.3v on D.
5. The CAN High should have a higher voltage than the CAN Low. This may help identify if a terminal has been pinned improperly.
6. The voltage on the wires should not match. If they do, you might have the 2 wires shorted together. Check the resistance between the 2 wires in
Step 4 to be sure.
7. If you get 0v or close to it on either wire, you probably have a short to ground on that wire. Step 6 will help you narrow down whether it's inside
the cab or outside the cab.
8. Check the resistance between pins C and D at the ATA diagnostic connector with the key off. It may be necessary to disconnect the batteries to
insure there is no voltage on the data link.
◦
◦
◦
◦
You should have approximately 60 ohms.
There are two 120 ohm resistors wired in parallel on the data link.
If you get close to 0 ohms, indicating low resistance, then you have a short between the 2 wires.
If you get 120 ohms, you have an open somewhere in the data link or you're missing one of the resistors. Step 6 will help you narrow down
whether it's inside the cab or outside the cab.
9. Check the resistance from pin C to ground and from pin D to ground at the diagnostic connector with the key off.
◦ Resistance should be greater than 1,000 ohms.
◦ If resistance is less than 1,000 ohms, then you have a short to ground.
◦ Step 6 will help you narrow down whether it's inside the cab or outside the cab.
10. If none of the modules are communicating and they are powered up, you probably have a short to ground, short to power, or a short between
the 2 wires.
◦ Make checks 3 thru 5 at the 1702 connector (where the chassis harness comes through the cab bulkhead on the right side) on both sides of
the connector. This will narrow your problem down to either inside the cab or outside the cab. Use the appropriate circuit diagram to find
the pin numbers and connector numbers for your truck.
11. If you still can't find the problem, write down your codes and measurements from the steps above and contact Tech Service.
◦ Include the specific voltages for each data link wire and which connector and terminal location you measured at. (This will help verify the
high and low wires are in the proper terminal location)
◦ Include the specific resistance you measured pin to pin on the data link and which connector and terminal location you measured at.
◦ Include the specific resistance to ground you measured for each data link wire, and which connector and terminal location you measured
at.
Additional Resources
• SFN 02‐94 ‐ J1939 Troubleshooting
• Advanced Electrical Guide
• Master Service Information Page
Connector Views
• Always refer to the wiring schematic book for the vehicle you are working on
• Verify which specific engine you are working with. This will help ensure you are viewing the correct schematic with the correct terminal
locations on the ECM connector
J1939 Data Link (CAN) Pin out at major connectors
(Public Data Link Only)
J1939 Pins
Connector View
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IK0800080 ­ 1939 Data Link Troubleshooting
Module
Connector
Location
Page 7 of 11
Pin (+) Pin (‐)
Diagnostic Connector
1650
Dash panel left of steering
wheel
(Bus‐under dash right of
steering wheel)
J1939 Splice Adapter
1024
1025
1026
Center of dash panel
GM AF
6018
Engine ECM
34(+) 47(‐)
ECM ‐ ISX 15L
6000
Engine ECM
22(+) 46(‐)
ECM ‐ ISB
6000
Engine ECM
22(+) 46(‐)
EIM ‐ MaxxForce 11 / 13 (EPA
07)
(Engine Interface Module)
6020
Left side of engine
12(+) 13(‐)
ECM ‐ N9 / N10
6020M
Right side of engine
35(+) 34(‐)
ECM ‐ MaxxForce 7 (EPA 10)
6020M
Right side of engine
Mounted on air filter
bracket
53(+) 54(‐)
ECM
6020M
C(+)
D(‐)
ECM
◦ N13
◦ MaxxForce 15
◦ MaxxForce 13 / 11
(EPA 10)
Left side of engine
76 Pin Chassis connector
(Grey)
C61
(+)
C62(‐
)
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IK0800080 ­ 1939 Data Link Troubleshooting
Page 8 of 11
◦ MaxxForce DT / 9 /
10
(EPA 07 / EPA 10)
◦ MaxxForce 7 (EPA 07)
◦ MaxxForce 5 (EPA 07)
DLCII Engine ECM
X3 ‐ 6020
Left side of engine above
starter (I6)
Top of left valve cover (V8)
12(+) 13(‐)
DLC NavPak Engine ECM
6007
Engine ECM ‐ Black
19(+) 20(‐)
Collision Avoidance ‐ Bendix
Wingman
8903
Front bumper
1(+)
6(‐)
ABS ‐ Bendix Air EC60
1400
In cab ‐ Right kick panel
8(+)
7(‐)
ABS ‐ Bendix Air EC30
4024
Brake ECU
C3(+) D3(‐)
ABS ‐ Wabco Air
9513
Wabco ECU Grey
7(+)
6(‐)
ABS ‐ Wabco Air
1420
In cab ‐ Right kick panel
3(+)
1(‐)
Collision Avoidance ‐ Wabco
OnGuard
8902
Front bumper
4(+)
5(‐)
Wabco Hydraulic Full Power
Brakes
9511
ECU is mounted on HCU
Left Frame Rail
14(+) 15(‐)
Allison LCT TCM
7305
TCM Grey
29(+) 32(‐)
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IK0800080 ­ 1939 Data Link Troubleshooting
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TCM ‐ Allison LCT Gen 4
7150
7151
Under cab
28(+)
8(‐)
TCM ‐ Allison
1503
In cab
10(+)
9(‐)
Allison MD / HD 3000
7204F
TCM Black
13(+) 29(‐)
Allison MD / HD 3000 Gen 4
7151
TCM
28(+)
8(‐)
Allison TC10 Shift Selector
1852
8(+)
15(‐)
ESC ‐ Electrical System
Controller
1600
In cab ‐ Left kick panel
34(+) 35(‐)
BC ‐ Body Controller
1602 (J5)
In cab ‐ Left kick panel
F3(+)
F2(‐)
EGC Gauge Cluster
1500
Left side of dash
4(+)
5(‐)
EGC Gauge Cluster
1501
Left side of dash
12(+) 11(‐)
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IK0800080 ­ 1939 Data Link Troubleshooting
Page 10 of 11
Compass
1912
Behind fuse panel (HPV)
Center of headliner
(5000/9000)
2(+)
3(‐)
SART Module
1610
In dash ‐ behind EGC
C(+)
D(‐)
SIC (Secondary Instrument
Cluster)
1502
Center dash
7(+)
4(‐)
AGSP (Aux Gauge Switch Pack)
1512
Right side dash
11(+) 10(‐)
TPMS (Tire pressure monitor
system)
8993F
Near radiator crossmember 12(+) 11(‐)
Eaton Autoshift / Ultrashift DM2 7905
Eaton Autoshift / Ultrashift DM3
7105
7909
Eaton Vorad
1227
Eaton Vorad VS‐400
8901
PAM Pyro ‐ AMP Meter Module 4087
At Gear Shift Selector
TCM
G2(+) G3(‐)
3(+)
2(‐)
D7(+) D8(‐)
Center of bumper support
bracket
4(+)
5(‐)
Cowl
7(+)
8(‐)
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IK0800080 ­ 1939 Data Link Troubleshooting
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Cummins ISM Engine ECM
6000
6014
Engine ECM
46(+) 47(‐)
CAT Engine ECM
6013
Engine ECM
50(+) 34(‐)
TCM
A(+)
Meritor Freedomline Trans TCM 7103
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