John Deere 523894 – Rear Chassis Module (SCC): High Voltage On Rear SCV Valves 4

The control system is detecting a voltage on the circuit for the #4 Electronic Selective Control Valve (E-SCV) stepper motor that exceeds the expected maximum threshold. This condition is typically caused by a short to power in the wiring harness or an internal electrical short within the stepper motor itself.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230R
• 6250R
• 6090M
• 6100M
• 6110M
• 6120M
• 6130M
• 6140M
• 6155M
• 6175M
• 6195M
• 5090R
• 5100R
• 5115R
• 5125R
• 6230
• 6330
• 6430

1. 1

   Park the machine on a level surface, lower all implements to the ground, turn off the engine, remove the key, and relieve all hydraulic pressure

2. 2

   Locate the E-SCV 4 stepper motor (A39) on the rear hydraulic valve stack, disconnect the electrical connector, and inspect the pins for corrosion, moisture, or bent terminals

3. 3

   Using a multimeter, perform a circuit test on the wiring harness running from the E-SCV 4 connector back to the Rear Chassis Module (SCC) to check for a short to power on the supply voltage lines

4. 4

   If the wiring harness tests within normal parameters and shows no shorts or damage, the fault is isolated to an internal failure of the E-SCV 4 stepper motor itself

1. 1

   Ensure the tractor is powered off, the hydraulic system is depressurized, and the area around the rear SCV valve stack is thoroughly cleaned to prevent dirt from entering the hydraulic system.

   Ensure the tractor is powered off, the hydraulic system is depressurized, and the area around the rear SCV valve stack is thoroughly cleaned to prevent dirt from entering the hydraulic system.

2. 2

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

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

3. 3

   Unbolt and carefully remove the defective stepper motor from the SCV valve body.

   Unbolt and carefully remove the defective stepper motor from the SCV valve body.

4. 4

   Install the new E-SCV stepper motor and tighten the mounting hardware to the OEM specified torque.

   Install the new E-SCV stepper motor and tighten the mounting hardware to the OEM specified torque.

5. 5

   Reconnect the electrical harness to the new motor.

   Reconnect the electrical harness to the new motor.

6. 6

   Power on the tractor and clear the stored 523894.00 fault code.

   Power on the tractor and clear the stored 523894.00 fault code.

7. 7

   Perform the E-SCV calibration procedure through the tractor's CommandARM display or using the John Deere Service ADVISOR diagnostic tool.

   Perform the E-SCV calibration procedure through the tractor's CommandARM display or using the John Deere Service ADVISOR diagnostic tool.

8. 8

   Test the operation of the #4 rear SCV to ensure proper functionality and verify the code does not return.

   Test the operation of the #4 rear SCV to ensure proper functionality and verify the code does not return.