John Deere 002169.09 – SCC: CAN BUS Message Fault for SCV 9, Rear Chassis

The Selective Control Center (SCC) has lost communication with the ninth Selective Control Valve (SCV) over the Controller Area Network (CAN) bus. This 'SV IX Message Missing' fault indicates a communication failure within the affected circuit, preventing the SCC from exchanging information with SCV 9.

• 9470RT
• 9520RT
• 9570RT
• 9R Series
• 9RT Series

1. 1

   Visually inspect the wiring harness and connectors associated with SCV 9 for chafing, corrosion, loose connections, or pinched routing.

2. 2

   Verify proper power (red wire, 12V) and ground (black wire) at the SCV 9 electrical connector.

3. 3

   Check if an adjacent SCV is also malfunctioning, which could indicate a shared power supply issue.

4. 4

   With the key on, measure CAN bus voltages at the SCV 9 connector: CAN High (yellow) should be 2.5-3.3V, and CAN Low (green) should be 1.8-2.5V.

5. 5

   Perform a wiggle test on the wiring harness and connectors between the SCC and SCV 9 while monitoring voltages or fault status for intermittent drops.

1. 1

   Address basic electrical issues

   Check battery voltage and fuses. Restart the engine to see if the communication fault clears on its own.

2. 2

   Repair wiring and connectors

   Repair or replace any damaged wiring sections found during inspection. Inspect the 9-pin electrical connector assembly (RE58827) and replace if necessary. Ensure all connections are clean and secure.

3. 3

   Isolate power and ground faults

   Jump power from a known good SCV connector to SCV 9 to test for a power supply issue. Provide a temporary direct ground from the tractor frame to the SCV 9 connector to rule out a grounding issue.

4. 4

   Repair or replace chassis harness

   Perform a continuity check between the SCC controller (often located under a panel behind the cab) and the SCV 9 connector. Repair or replace the chassis harness if a break is found.

5. 5

   Replace SCV controller

   If all wiring, power, ground, and CAN voltages are confirmed good, the electronic controller on SCV 9 has likely failed and must be replaced.