GEAR-BEVEL 1117538 - Caterpillar

The CID 246 - FMI 9 diagnostic code is used by the Implement ECM to indicate that the proprietary CAN data link has an abnormal condition. This proprietary CAN data link is also referred to as the AccuGrade CAN data link. The possible causes of this diagnostic code are:
Poor electrical connection in the machine harness (likely between the three sensors and the Implement ECM)
The CAN data link circuit in the machine harness is open.
A terminal resister is faulty.
A circuit in the AccuGrade CAN data link is shorted to ground.*
The CAN data link circuit in the machine harness is shorted to the +battery circuit.*Note: * This condition would most likely cause other CAN data link faults to be activated. System Response:Machine components that directly communicate on the AccuGrade CAN Data Link will be unavailable. Before troubleshooting, cycle the power to the system. Use the monitor display or Caterpillar Electronic Technician (Cat® ET) to see that all the required components are shown as "Connected" and that the 246-9 diagnostic code is still active. Perform the following procedure only when the 246-9 diagnostic code is active. Note: Ensure that the correct software (ECM flash file) is being used. Test Step 1. Inspect the harness connectors on the AccuGrade CAN Data Link
Turn the key start switch and the disconnect switch to the OFF position.
Refer to the complete machine Electrical System Schematic for your machine. Inspect the connections that are involved in the CAN data link circuit. Concentrate on the AccuGrade sensor connectors.
Ensure that all connections are clean, secure and in good condition. Note: Suspect the datalink connections from the Implement #1 ECM to the Blade Slope, Main Fall, and Rotation sensors first. Note: Refer to Testing and Adjusting, "Electrical Connector - Inspect" in this manual. Expected Result:The machine harness connections are correct. Results:
OK - The machine harness connections are correct. Proceed to Test Step 3.
NOT OK - One or more of the machine harness connections are not correct. Repair: Repair or replace any bad contacts, connectors, or wires that are not in good condition in the machine harness. STOPTest Step 2. Check for an Open AccuGrade CAN Harness
The key start switch and the disconnect switch remain in the OFF position.
All related control modules remain disconnected from the machine harness.
At the machine harness connector J2 for the Implement ECM, measure the resistance from all AccuGrade CAN data link Implement ECM contacts (high and low) to the corresponding connections at each of the AccuGrade components. Expected Result:The resistance measurements for each of the AccuGrade CAN circuits (high and low) are less than 5 ohms. Results:
OK - The resistance measurements for each of the CAN circuits (high and low) are less than 5 ohms. Repair: The CAN data link circuit in the machine harness is correct. Proceed to Test Step 8.
NOT OK - The resistance measurements for one or more of the AccuGrade CAN circuits (high and low) are greater than 5000 ohms. Repair: The AccuGrade CAN circuit is open in the harness or the