John Deere 523890.01 – SIC: A36 Stepper Motor ESCV 1, Supply Voltage Out of Valid Range Low

The system voltage (battery voltage) measured at the stepper motor of ESCV 1 drops below 9 volts, which can cause the stepper motor to not operate correctly due to insufficient power, leading to impaired performance or total loss of control of the associated hydraulic functions.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230
• 6330
• 6430
• 7230
• 7530
• 7830
• 7230R

1. 1

   Check the tractor's battery for proper charge and overall health, as a weak battery can cause system-wide low voltage.

2. 2

   Use a multimeter to measure the voltage directly at the A36 stepper motor for ESCV 1 to confirm if it is receiving less than 9 volts.

3. 3

   Inspect the wiring harness and connectors between the SIC control unit and the ESCV 1 stepper motor for damage, wear, corrosion, or loose connections.

4. 4

   Use John Deere diagnostic tools to test the A36 stepper motor to ensure it hasn't been internally damaged by the voltage irregularity.

1. 1

   Resolve Power Supply Issues

   If the battery or alternator is failing, repair or replace those components to restore stable system voltage (above 9 volts).

2. 2

   Repair the Harness

   If the multimeter test shows low voltage at the motor but good voltage at the source, repair or replace the damaged wiring or corroded connectors in the ESCV 1 circuit.

3. 3

   Replace the Stepper Motor

   If the power supply and wiring are verified to be in good condition but the code persists, or if the motor fails the diagnostic test, replace the A36 Stepper Motor.

4. 4

   Update Software

   Ensure the SIC control unit firmware and software are updated to the latest version to rule out software-related voltage monitoring glitches.

5. 5

   Clear and Test

   Clear the fault codes and operate the ESCV 1 hydraulic functions to confirm the repair.