John Deere 523893.04 – Rear Chassis Module (SCC): E-SCV 4 Stepper Motor, Temperature Too Low

The internal temperature sensor of the E-SCV 4 stepper motor registers a temperature that is below the valid operating threshold, indicating an open circuit, a wiring fault, or a failed internal thermistor inside the stepper motor.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230
• 6330
• 6430
• 6230R
• 6250R
• 6090M
• 6100M
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 5090R
• 5100R
• 5115R
• 5125R

1. 1

   Use John Deere Service ADVISOR or the tractor's CommandCenter display to monitor the live temperature reading of the E-SCV 4 stepper motor. An impossibly low number confirms a sensor/circuit failure.

2. 2

   Inspect the wiring harness and connector at the E-SCV 4 motor (A39) at the rear valve block. Look for corrosion, backed-out pins, moisture intrusion, or broken wires that would cause an open circuit.

3. 3

   Perform an operational check of the E-SCV 4 Stepper Motor via the CommandCenter diagnostic menu.

4. 4

   To isolate whether the issue is in the tractor's wiring harness or the motor itself, swap the electrical connector of the E-SCV 4 motor with an adjacent, known-good motor (like E-SCV 3). If the fault code changes to the SCV 3 circuit, the wiring/module is at fault. If the fault stays with the SCV 4 motor, the stepper motor itself has failed internally.

1. 1

   Preparation

   Park the tractor on a level surface, turn off the engine, and relieve all hydraulic system pressure by cycling the SCV levers/controls.

2. 2

   Locate the Valve

   Access the rear hydraulic SCV stack on the back of the chassis and identify the #4 valve block.

3. 3

   Disconnect

   Unplug the electrical harness connector from the E-SCV 4 stepper motor.

4. 4

   Removal

   Remove the retaining hex screws/bolts that secure the stepper motor to the hydraulic valve body. Carefully pull the stepper motor straight back to remove it.

5. 5

   Installation

   Clean the mating surface on the valve body. Install the new E-SCV stepper motor and torque the mounting hardware to OEM specifications.

6. 6

   Reconnection

   Plug the electrical harness back into the new stepper motor.

7. 7

   Calibration

   Turn the tractor's key to the ON position. You must calibrate the new E-SCV stepper motor using the John Deere Service ADVISOR tool or through the CommandCenter display's hydraulic setup menu so the SCC module can learn the new motor's end-stops and neutral positions. Clear the stored 523893.04 fault code.