John Deere 523871.18 – SCO / SIC: Stepper Motor for E-SCV XIII, Hydraulic Oil Temperature and Supply Voltage Too Low

The system has detected that the supply voltage at the stepper motor for Electronic Selective Control Valve (E-SCV) 13 has dropped too low (typically between 9-11 volts) while the hydraulic oil temperature is also extremely cold (between -25°C and -15°C). Because cold, thick hydraulic oil requires more electrical current to actuate the valve, the low voltage condition prevents the stepper motor from operating safely, resulting in an 'ICV/SCV inoperative' state.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230
• 6330
• 6430
• 7430
• 7530

1. 1

   Warm up the machine until the hydraulic oil reaches normal operating temperature

2. 2

   Check system voltage (battery and alternator output must be above 11 volts)

3. 3

   Inspect the front chassis harness and measure voltage directly at the E-SCV XIII stepper motor connector for voltage drops, corroded pins, or loose grounds

1. 1

   Warm up hydraulic oil

   Start the tractor and allow it to idle until the hydraulic oil temperature is above freezing and reaches normal operating parameters. Clear the codes.

2. 2

   Verify charging system voltage

   If the code remains active after the oil is warm, use a multimeter to verify that the tractor's charging system is delivering a steady 12-14V to the SCO/SIC module.

3. 3

   Clean electrical contacts

   Disconnect the electrical connector at the E-SCV XIII stepper motor. Clean the contacts with electrical contact cleaner and apply dielectric grease.

4. 4

   Check wiring harness

   Check the wiring harness leading from the Front Chassis Module (SCO) to the SCV 13 valve for chafing or breaks. Repair any damaged wires.

5. 5

   Replace stepper motor

   If the voltage at the connector is correct, the oil is warm, and the code persists, the E-SCV stepper motor itself has likely failed internally and must be replaced.

6. 6

   Calibrate stepper motor

   After replacing the stepper motor, use a John Deere Service ADVISOR tool to calibrate the new SCV stepper motor.