John Deere 000924.03 – SCO: High Voltage On Front SCV Valves 10,11

The Secondary Hydraulic Control Unit (SCO) has detected a voltage above normal (FMI 03) in the circuit for the front Selective Control Valves (SCVs), specifically identified as valves 10 and 11. This indicates that the control unit is reading a voltage higher than the expected operational range, which can be caused by a short to power in the wiring harness, a failed solenoid, or an internal fault within the SCO controller itself.

• 7R Series
• 8R Series
• 8RT Series
• 8RX Series
• 9R Series

1. 1

   Visually inspect the electrical system around the batteries and alternator for any signs of damage, corrosion, or loose connections causing system-wide high voltage

2. 2

   Check fuses associated with the hydraulic control modules (specifically look for fuses F29 or F30 depending on the model)

3. 3

   Carefully examine the wiring harness leading to the front SCV solenoids and the SCO controller for physical damage, chafing, pinching, or corrosion that could cause a short to a power source

4. 4

   Restart the tractor to determine if the issue is a transient electrical fault that clears upon reboot

1. 1

   Test solenoid resistance

   Using a multimeter, test the resistance of the solenoids on the front SCV valve block. An out-of-spec reading indicates a failed solenoid.

2. 2

   Swap solenoids for diagnosis

   If accessible and similar, swap the suspect solenoid with a known good one from an adjacent SCV. If the fault code follows the solenoid to the new position, the solenoid is faulty and requires replacement.

3. 3

   Check voltage at the controller

   If the solenoids and wiring appear to be in good condition, use a breakout harness to check the voltage output from the SCO controller to the SCV circuit to determine if the controller is sending an incorrect voltage.

4. 4

   Replace faulty components

   Based on diagnostic findings, replace the faulty SCV solenoid, repair or replace the affected section of the wiring harness, or replace the SCO controller if it is outputting incorrect voltage.