John Deere 002028.09 – XSC: StarFire Receiver Messages Missing

A fault has been detected in the communication of the CAN BUS message related to the Steering Module (XSC). The XSC is not receiving the expected data messages over the CAN bus from the StarFire™ GPS receiver, indicating a potential issue with data transmission or reception within the steering module's communication system. This communication failure directly affects the machine's guidance and auto-steering functions.

• 6145J
• 6165J
• 6180J
• 6205J

1. 1

   Visually inspect the wiring harness and connectors between the StarFire™ receiver, main vehicle harness, and XSC module for damage, corrosion, or loose connections

2. 2

   Check for any active fault codes on the StarFire™ receiver itself, as an internal fault can prevent communication

3. 3

   Perform a 'cold boot' power cycle by turning the machine completely off, waiting a few minutes, and restarting to see if the error clears

4. 4

   With the key ON, measure CAN bus voltages: CAN High (Yellow wire) to Ground should be 2.5V to 3.0V, and CAN Low (Green wire) to Ground should be 2.0V to 2.5V

5. 5

   With the key OFF, measure resistance between CAN High and CAN Low wires. It should be approximately 60 Ohms (120 Ohms indicates a missing or faulty terminating resistor)

6. 6

   Check CAN bus utilization percentage in the diagnostic display. A working receiver adds a 5-7% load; a load over 45% can cause controllers to drop messages

1. 1

   Verify the Fault

   Confirm that the fault code 002028.09 is active.

2. 2

   Perform Pre-Checks

   Complete all the diagnostic checks listed above. A significant number of CAN bus faults are resolved at this stage by fixing a wiring or connection issue.

3. 3

   Isolate the Issue: Check StarFire™ Receiver

   If possible, test the machine with a known-good StarFire™ receiver. If the fault code disappears, the original receiver is likely faulty.

4. 4

   Isolate the Issue: Check Harness Integrity

   Disconnect the harness from both the StarFire receiver and the XSC module. Check for continuity on the CAN High and CAN Low wires from end to end, and check for any shorts between the CAN wires and power or ground.

5. 5

   Component Replacement

   If the problem is isolated to a specific component, replace it. Replace the StarFire™ receiver if it is determined to be faulty. If the XSC module is determined to be faulty, replace it.

6. 6

   Clear Codes and Re-test

   After any repair or replacement, clear all diagnostic trouble codes and operate the machine to ensure the fault does not return.