John Deere 002161.09 – SCC: SV I Message Missing

The Selective Control Unit (SCC) is not receiving the required CAN bus messages from the first Selective Control Valve (SV I). This indicates a communication breakdown on the network between the main hydraulic controller and the electronic control module integrated into the first hydraulic valve, resulting in the inability to operate the hydraulic functions associated with that specific valve.

• 8225R
• 8235R
• 8245R
• 8260R
• 8270R
• 8285R
• 8295R
• 8310R
• 8320R
• 8335R
• 8345R
• 8360R
• 8430
• 8530
• 8310RT
• 8335RT
• 8360RT
• 9230
• 9330
• 9430
• 9530
• 9630
• 9470RT
• 9520RT
• 9570RT

1. 1

   Visually inspect the wiring harness and connectors between the SCC and the SV I valve for chafing, corrosion on pins, loose connections, or pinched wires.

2. 2

   Perform a CAN Bus Resistance Check with the battery disconnected. Measure resistance between CAN High (Yellow) and CAN Low (Green). Approximately 60 Ohms is normal; 120 Ohms indicates a missing terminating resistor or a break in the wire; near zero indicates a short circuit.

3. 3

   Perform a CAN Bus Voltage Check with the system powered on. CAN High should be 2.5V to 3.5V; CAN Low should be 2.5V to 1.5V. If both show around 2.5V, suspect a short between them. Voltages outside the expected range may point to a faulty controller pulling the bus voltage down.

4. 4

   Review active and stored diagnostic trouble codes for other communication faults (codes ending in .09) to help locate a broader network problem.

1. 1

   Isolate the faulty component

   Disconnect the electrical connector at the SV I valve and re-measure the CAN bus resistance. If the resistance returns to a normal value (e.g., from 120 Ohms or a short circuit back to 60 Ohms), it strongly suggests an internal failure within the electronic portion of the SV I valve.

2. 2

   Repair wiring harness

   If disconnecting the SV I valve does not resolve the incorrect resistance reading, the fault likely lies within the wiring harness between the SCC and the SV I. Repair or replace the damaged section of the harness and ensure all connections are clean and secure.

3. 3

   Replace SV I valve

   If the isolation test points to the SV I valve as the faulty component, replace the entire valve assembly, as the electronic controller is integrated into the valve.

4. 4

   Replace SCC module

   If the wiring is intact and the SV I valve is not the cause, the Selective Control Unit (SCC) itself may be faulty. Replace the SCC module only after all other possibilities have been exhausted.