J1939 Pre-installation Check Out
Vehicle Data Bus Connections
11-4
MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION
80-J4866-2 Rev. G
J1939 Pre-installation Check Out
Prior to beginning any installation, start the vehicle and verify that the vehicle is in good
working order, has no faults, and no check engine lights display.
Resistance Test (to Verify that J1939 Is Present)
1.
Turn ignition OFF.
2.
Verify that J1939 is present on vehicle. Locate the 9-pin diagnostic (Deutsch) connector.
Note
If you have a 6-pin connector, you have J1708/J1587 only. See
3.
Using an ohmmeter, place the positive lead on pin C and the negative lead on pin D of
the diagnostic connector. Verify that the resistance is 55–65 ohms.
• If the resistance is not 55–65 ohms, there is a problem with your J1939 data bus. Fix
the problem.
Note
On some vehicles, open doors and/or cabin lights on may cause CAN/J1939 bus
activity which may interfere with diagnostic connector resistance measurements.
• Pin C CAN High (tractor bus) yellow
• Pin D CAN Low (tractor bus) green
Pin D
CAN Low
Pin C
CAN High
9-Pin Diagnostic Connector
Содержание MCP100
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