Terex J1939 User manual

TEREX UTILITIES TECHNICAL SUPPORT TEAM
PHONE: 1-844-TEREX4U (1-844-837-3948) | EMAIL: [email protected]
MODEL(S): TOOLS NEEDED:SERVICE CALL:
NO.
TROUBLESHOOTING J1939
CONNECTOR
TEREX MODELS USING J1939
CONNECTORS
DIGITAL MULTIMETER
TROUBLESHOOTING J1939 CONNECTOR
87

DANGER
Failure to obey the instructions and safety
rules in the appropriate Operator’s Manual and
Service Manual for your machine will result in
death or serious injury.
Many of the hazards identied in the
Operator’s Manual are also safety hazards
when maintenance and repair procedures are
performed.
DO NOT PERFORM
MAINTENANCE UNLESS:
√You are trained and qualied to perform
maintenance on this machine.
√You read, understand and obey:
•manufacturer’s instructions and safety rules
•employer’s safety rules and worksite
regulations
•applicable governmental regulations
.
√You have the appropriate tools, lifting
equipment and a suitable workshop.
The information contained in this Tech Tip is a
supplement to the Service Manual. Consult the
appropriate Service Manual of your machine for
safety rules and hazards.
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TECH TIP 87 | RELEASED 09.21.2022 | VERSION 1.0
TECH TIP 87 | RELEASED 09.21.2022 | VERSION 1.0
©TEREX UTILITIES. ALL RIGHTS RESERVED

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CONTENTS
TECH TIP#87
TOC
4| J1939
INTRODUCTION
5| Troubleshooting
STEP 1
6| Voltage
STEP 2
TECH TIP 87 | RELEASED 09.21.2022 | VERSION 1.0

TECH TIP 87 | RELEASED 09.21.2022 | VERSION 1.0
INTRODUCTION
This Tech-tip will guide you through checking the resistance and voltage in the J1939 datalink. J1939
is a high-speed vehicle data link that can communicate at either 250kb/s or 500kb/s. The datalink
consists of three wires: yellow is CAN +, green is CAN - and Shield is connected to ground.
Note: Black connecter primary CAN is 250K, the green connector primary CAN is 500K. Figure 2
Two 120 Ω resistors are required to complete the J1939 network topology.
Note: It is important to use twisted pair wires to evenly distribute electrical static between CAN + and
CAN -.
FIGURE 1 FIGURE 2
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TECH TIP 87 | RELEASED 09.21.2022 | VERSION 1.0
STEP 1
Turn the ignition key off and disconnect the batteries. Set the multimeter to ohms and place the leads
between CAN + (Pin C) and CAN - (Pin D).
Use the table below to evaluate and troubleshoot the datalink as directed.
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TECH TIP 87 | RELEASED 09.21.2022 | VERSION 1.0
STEP 2
CAN + and CAN - will be tested separately. Turn the ignition key ON and put one test lead on ground
and the other lead on CAN + (Pin C) or CAN - (Pin D).
Use the following table to determine if CAN + and CAN - have the correct voltage.
If it is conrmed that the J1939 circuit is in fault, it must be taken to an authorized dealership for
repairs.
PAGE 6 OF 7

FOR FURTHER ASSISTANCE,
CONTACT THE TEREX UTILITIES TECHNICAL SUPPORT TEAM
PHONE: 1-844-TEREX4U (1-844-837-3948) | EMAIL: [email protected]