John Deere 926.03 – SCO: Stepper Motor for E-SCV XIII, Supply Voltage Too High

The system has detected that the supply voltage (BAT) for the stepper motor of Electronic Selective Control Valve 13 (E-SCV XIII) has risen above 16 volts. Excessive voltage can damage the internal components of the valve. As a protective measure, the control software will limit or completely disable the function of the affected selective control valve.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230R
• 6250R
• 6090M
• 6100M
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 5090R
• 5100R
• 5115R
• 5125R
• 8R Series

1. 1

   Monitor voltage at the stepper motor input to confirm if it is actively spiking above 16 volts

2. 2

   Inspect the wiring harness and connections routing to the E-SCV XIII stepper motor for any signs of a short to power (chafed wires touching a higher voltage source)

3. 3

   Verify that the power supply from the SCO module to the stepper motor is stable and within the required voltage range

4. 4

   Inspect all electrical connectors at the valve and the SCO module for corrosion, looseness, or bent pins

1. 1

   Disconnect Power

   Turn off the machine and disconnect the battery to prevent further electrical damage during repair.

2. 2

   Repair Wiring

   If the diagnostic checks revealed a short to power in the harness, repair or replace the damaged section of the wiring.

3. 3

   Clean Connections

   Clean and secure any loose or corroded electrical connections at the E-SCV XIII and the SCO module.

4. 4

   Replace Faulty Power Supply/Module

   If the SCO module or voltage regulator is internally shorted and outputting excessive voltage to the valve, the module itself will need to be replaced.

5. 5

   Replace the Stepper Motor

   If the high voltage condition has burnt out the stepper motor, or if the motor has an internal short causing the fault, remove the faulty E-SCV stepper motor and install a replacement.

6. 6

   Recalibrate and Test

   Reconnect power, clear the fault codes, and cycle the SCV controls to ensure the voltage stays within the normal operating range and the valve functions properly.