Yanmar
®
600 Control Panel Operation and Troubleshooting
463-3000-09 Initial - 16-May-2008 29
Testing a Warning or Shutdown
Shutdown simulation with ECU controlled engines requires using the ECU diagnostic tool. Refer to the
diagnostic tool documentation to simulate a warning or shutdown.
Testing CANbus
Most information provided to the CANplus display is sent by the ECU via the CANbus. CANbus is an
international data bus used to support SAE J1939. If this connection is broken or improperly terminated, the
CANplus display cannot show ECU parameters such as engine hours, oil pressure and diagnostic codes.
This test procedure helps identify the problem location.
1. Disconnect the battery.
Warning
This test should be completed with the battery disconnected!
Failure to disconnect the battery may cause ECU, panel or test equipment damage!
2. Identify the engine diagnostic plug. Connect an ohmmeter across the CANbus pins of the diagnostic
plug.
3. A reading of 60Ωindicates both ends of the bus are terminated and the bus is intact.
4. A reading of 120Ωindicates only one end of the bus is terminated. Identify the CANbus terminator
on the engine harness and remove it.
a. An ohmmeter reading of 120Ω indicates the bus to the terminator in the panel is complete
and the problem is between the panel and the engine terminator.
b. An open circuit ohmmeter reading indicates the bus to the engine terminator is complete
and the problem is between the panel and the diagnostic plug.
5. Reinstall the terminator resistor and reconnect the battery.
a. If the ECU diagnostic tool is available, use it to verify the ECU is transmitting CANbus data.
Refer to ECU documentation to identify and correct the error.
b. If another panel is available for testing, replace the panel to determine if the error is in the
panel.
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