John Deere 002166.09 – SCC: Loss of Communication with SCV 6

A communication failure has occurred on the CAN bus, indicating the Selective Control Valve Controller (SCC) is not receiving the expected message from the sixth Selective Control Valve (SCV 6). The '.09' extension signifies a loss of communication, which disables control of SCV 6 and may affect the operation of other SCVs.

• 9230
• 9330
• 9430
• 9530
• 9630
• Early model 9R Series
• 9R 390
• 9R 440

1. 1

   Cycle the main power switch off and on to see if the code clears

2. 2

   Verify the fault code is active when attempting to operate SCV 6

3. 3

   Check for a stable power supply and solid ground connection at the SCV 6 electrical connector

4. 4

   Determine if another SCV in the same power group (e.g., SCV 5) is also inoperative, which strongly suggests a shared power supply problem

5. 5

   Visually inspect the wiring harness and connectors between the SCC controller and SCV 6 (especially on the frame behind the SCV) for corrosion, damage, or loose connections

6. 6

   Perform continuity checks from the SCV connector to the frame connector, and from the frame connector to the middle connector of the Rear Chassis Controller

7. 7

   With the battery disconnected, measure CAN bus resistance between pins C and D of the diagnostic connector (60 ohms is normal; 120 ohms indicates a faulty or disconnected terminating resistor)

1. 1

   Clean and repair connectors

   If corrosion is found in any connectors, clean them thoroughly. If a simple power or ground issue is identified, repair the specific wire.

2. 2

   Apply temporary field workaround

   In a field-critical situation, temporarily jump power from an unused SCV connector to SCV 6, or run a temporary ground wire from the SCV connector to a clean point on the tractor's frame. Note: This is not a permanent solution.

3. 3

   Repair or replace wiring harness

   If continuity checks reveal a break in the chassis harness, replace the harness or run a new wire to bypass the break. Replacing the entire harness is the most reliable long-term solution.

4. 4

   Replace Selective Control Valve

   In the less likely event that the wiring and CAN bus are fully intact but the fault persists, replace the SCV 6 unit itself.