John Deere 639: CAN Bus Messages Not Received by Right Control Unit

The Right Control Unit is not receiving CAN Bus messages in a timely manner. This can result in no effect, slow response, or the machine becoming inoperable. Additional Diagnostic Trouble Codes may indicate the specific message that has been lost.

1. 1

   The communication link between the Right Control Unit and the CAN Bus

2. 2

   The integrity of the wiring and connections to the Right Control Unit

3. 3

   The functionality of the component sending the CAN Bus messages

1. 1

   Inspect

   Inspect the wiring and connections to the Right Control Unit for damage, corrosion, or loose connections.

2. 2

   Test

   Test the communication link between the Right Control Unit and the CAN Bus using diagnostic tools.

3. 3

   Verify

   Verify the functionality of the component responsible for sending the CAN Bus messages.