John Deere 000925.04 – SCC: Low Voltage On Rear SCV Valves 3, 4, 6

The system has detected a low voltage condition on the electrical circuits for the rear Selective Control Valves (SCVs) numbered 3, 4, and 6. This indicates an issue with the power supply or the wiring harness connected to these specific hydraulic valve solenoids, likely involving a shared power or ground circuit that has fallen below its specified voltage threshold.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8235R
• 8260R
• 8310R
• 8335R
• 8360R
• 8310RT
• 8335RT
• 8360RT
• 9120
• 9220
• 9320
• 9420
• 9520
• 9620
• 9470RT
• 9520RT
• 9570RT

1. 1

   Perform an initial system reset by cycling the tractor's power or performing a Hydraulic Option Connector Reset Procedure

2. 2

   Check battery and charging system voltage (should be at least 12.6V with engine off, and 13.5-14.5V while running). Reducing overall electrical load or increasing engine RPM can sometimes resolve temporary low voltage situations.

3. 3

   Inspect fuses related to the SCC, chassis controller, or hydraulic functions for blown fuses

4. 4

   Visually inspect the wiring harness running to the rear SCV block and connectors for valves 3, 4, and 6 for pinched, chafed, frayed, or corroded wires

5. 5

   Test voltage directly at the SCV solenoids (unplug connector, turn key on, activate SCV lever, and check for 12V)

1. 1

   Isolate the Faulty Component

   Based on the diagnostic checks, determine if the issue is in the wiring harness, the SCC module, or the valve solenoids.

2. 2

   Repair Wiring

   If a damaged section of the wiring harness is found, repair it by splicing in new wire and sealing against moisture. If damage is extensive or at a connector, replace the relevant section of the harness.

3. 3

   Check Solenoid Resistance

   Measure the resistance of the valve coils with a multimeter (typically around 7.2 ohms for John Deere). Replace any coil that is open (infinite resistance) or shorted (zero resistance).

4. 4

   Replace the SCV Controller (SCC)

   If the wiring and solenoids test good, the SCC module itself may be faulty and unable to supply the correct voltage. Replace the controller and perform the required calibration procedure.