80-JB400-1 Rev. D 9-9
MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION
Vehicle Data Bus Connections Making the Connection
Making the Connection
1. Start the vehicle and verify that the truck is in good working order and displays no dash
faults.
2. Turn OFF the truck and ensure that no dash lights are on.
3. Measure the J1939 bus resistance at the diagnostic connector. It should read 60 ohms.
Note
Some trucks may have activity on the J1939 bus with the door open or if an accessory
is active. This can cause a faulty resistance reading on the CAN bus.
4. Locate the OEM J1939 stub connector and the CAN mating connector on the MCP110
accessory cable. These are usually located either in the truck’s B pillar or in the center
of the dash.
5. Connect the two J1939 connectors. If a stub does not exist, splice directly into the
J1939 backbone. Locate a connector point and Ohm out (0 Ohms) CAN + and CAN -
wires to Pin C (CAN high) and Pin D (CAN low) on the diagnostic connector.
6. Measure the J1939 bus resistance at the diagnostic connector. It should read 60 ohms.
7. Start the vehicle and verify that the truck is in good working order and displays no dash
faults.
8. Verify that the J1939 data is being passed to the MAS110 from the data bus by
monitoring the VDS screen on the MAS110. (Refer to Verifying Data Source
Connectivity on page 9-12.)
9. Stow and secure any loose wires, making sure to keep the wires clear of sharp edges
and away from panels and moving parts.
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