John Deere 002646.03 – SCC: High Voltage On Rear SCV Valves 1,2,5

The monitoring system has detected a high voltage condition in the electrical circuit for the rear Selective Control Valves (SCVs) at positions 1, 2, and 5. This indicates an electrical fault, such as a short circuit to a power source or an internal failure within an electrical component, rather than a hydraulic issue.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R

1. 1

   Visually inspect the wiring harnesses and connectors associated with SCV valves 1, 2, and 5 for pinched or frayed wires, corrosion, or loose connections.

2. 2

   Using a multimeter, test the signal wire for each affected SCV solenoid for a short circuit to a power source (voltage present when it should not be).

3. 3

   Disconnect the wiring harness from both the SCC and the SCV valves to check for continuity and shorts between wires in the harness.

4. 4

   Test the resistance of the solenoids for SCV valves 1, 2, and 5 to check for an out-of-specification reading indicating an internal short.

5. 5

   Swap the solenoid from one of the faulting SCVs with a known good SCV (e.g., SCV 3 or 4) to isolate the component. If the fault follows the solenoid, it is faulty.

1. 1

   Prepare machine and relieve pressure

   Park the tractor on a level surface, engage the parking brake, and turn off the engine. Relieve any residual hydraulic pressure by moving the SCV control levers back and forth several times.

2. 2

   Access rear SCV block

   Remove any necessary protective covers to access the rear SCV block and its electrical connectors.

3. 3

   Repair or replace wiring

   If diagnostic checks revealed a damaged wiring harness or connector, repair or replace the affected section (a conversion wiring harness may be available). Ensure all connections are clean and secure.

4. 4

   Replace faulty solenoid

   If a solenoid is identified as faulty, disconnect its electrical connector and remove it from the valve block. Install the new solenoid, ensuring seals or O-rings are correctly seated, and reconnect.

5. 5

   Replace SCV valve assembly

   If there is an internal failure within the valve block that cannot be repaired by replacing external components, replace the entire SCV valve assembly.

6. 6

   Clear fault codes

   Reconnect the battery, start the tractor, and use the tractor's diagnostic system or a compatible scan tool to clear the fault code.

7. 7

   Verify repair

   Operate the affected SCVs to ensure they are functioning correctly and that the fault code does not reappear.