NHTSA ID Number: 10130950
Manufacturer Communication Number: IK0800080
TSB/Document Date: 2018-04-02
Summary
J1939 Data Link Troubleshooting
◦ If no wiring issue is located suspect a faulty module
• If no change in voltage is noted when modules are unplugged
inspect for data link High(+) and Low(‐) shorted together
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IK0800080 1939 Data Link Troubleshooting
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No: Continue to Step 10
8
Does either terminal have abnormally high voltage?
9
Does either terminal have abnormally low voltage?
Yes: Check wiring for a Short to Power
No: Continue to Step 9
Yes: Check wiring for a Short to Ground
No: Return to Step 6 and re‐test.
Yes: Continue to Step 11
No:
10 Is the voltage on Terminal C (+) higher than Terminal D (‐)?
11
• Disconnect the batteries.
• Measure the resistance from Terminal C to D.
• Verify the wire is in the correct terminal location.
• Verify the wiring is spliced to the correct wire of the backbone.
Yes: Continue to Step 16
No: Continue to Step 12
Do you have approximately 60 ohms?
12 Do you have approximately 120 ohms?
13 Does the resistance read O.L (Open)?
Yes: Continue to Step 18
No: Continue to step 13
Yes: Inspect stub wiring from the module connector to the
backbone of the data link. Repair wiring as needed and re‐test.
No: Continue to step 14
14 Is the resistance near 40 ohms?
Yes: Inspect for body builder components that may have installed a
3rd terminating resistor
No: Continue to Step 15
Yes: Inspect data link wiring for High(+) and Low(‐) shorted together
15 Is the resistance < 40 ohms
16
• Measure the resistance from Terminal C to Gnd
Does resistance measure > 1000 ohms?
17
• Measure the resistance from Terminal D to Gnd
Does resistance measure > 1000 ohms?
• Unplug the 1702 connector.
• Measure resistance on connector 1702 (Male Terminals)
18
◦ Note: This wiring harness runs outside the cab
Is the resistance near 120 ohms?
19
• Unplug the 1702 connector.
• Measure resistance on connector 1702 (Female Terminals)
◦ Note: This wiring harness runs to the pass through on
the right side the cab and continues through the dash
over to the 1701 connector on the left side of the cab
No: Return to Step 11 (Resistance out of range has not been
detected)
Yes: Continue to Step 17
No: Inspect data link wiring for a short to ground.
Yes: Continue to Step 18
No: Inspect data link wiring for a short to ground.
Yes: Continue to Step 19
No: Continue to Step 20
Yes: Return to Step 12 (Open not detected)
No Continue to Step 21
Is the resistance near 120 ohms?
20
Yes: Locate and repair open wire in the circuit.
• Locate Terminating Resistor #1.
No: Replace the terminating resistor and re‐test.
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IK0800080 1939 Data Link Troubleshooting
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• Unplug the terminating resistor and measure the resistance
from terminal A to B on the resistor.
Is the resistance near 120 ohms?
21
Yes: Locate and repair open wire in the circuit.
• Locate Terminating Resistor #2.
• Unplug the terminating resistor and measure the resistance
from terminal A to B on the resistor.
No: Replace the terminating resistor and re‐test.
Is the resistance near 120 ohms?
( Back to Top )
Service Part(s) Information
Description
Part Number
Bulk Data Link Cable
3519281C2
Terminating Resistor
3519178C91
( Back to Top )
Additional Resources
• SFN 02‐94 ‐ J1939 Troubleshooting
• Advanced Electrical Guide
• Master Service Information Page
( Back to Top )
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)
Module
Connector
J1939 Pins
Location
Pin (+)
Pin (‐
)
C(+)
D(‐)
Diagnostic Connector
1650
Dash panel left of
steering wheel
(Bus‐under dash right
of steering wheel)
J1939 Splice Adapter
Note: There is no terminal "I"
1024
1025
1026
Center of dash panel
GM AF
6018
Engine ECM
34(+) 47(‐)
6000
Engine ECM
22(+) 46(‐)
Connector View
ECM
◦ N13
◦ MaxxForce 15
◦ MaxxForce 13 / 11
(EPA 10)
ECM ‐ ISX 15L
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IK0800080 1939 Data Link Troubleshooting
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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(‐)
6020M
Left side of engine
76 Pin Chassis
connector
(Grey)
C61
(+)
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(‐)
Engine DCU ‐ Doser Control
Unit
6340
ECM
◦ MaxxForce DT / 9 /
10
(EPA 07 / EPA 10)
◦ MaxxForce 7 (EPA
07)
◦ MaxxForce 5 (EPA
07)
C62(‐
)
14(+) 15(‐)
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◦ MaxxForce DT / 9 /
10 (EPA 10)
◦ N9 / N10 (EPA 10)
Collision Avoidance ‐ Bendix
Wingman
8903
Bendix Wingman DIU (Driver
Interface Unit)
1943M
1400
Front bumper
1(+)
6(‐)
7(+)
6(‐)
In cab ‐ Right kick
panel
8(+)
7(‐)
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 OnGuard DIU (Driver
Interface Unit)
1944
A(+)
B(‐)
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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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
Allison WTEC 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 ‐ Electronic Gauge Cluster
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TSB/Document ID: IK0800080
Replacement Service Bulletin Number:
MFR Communication Date: 2014-10-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:ELECTRICAL
MFR Component System:
MFR Component Subsystem:
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