John Deere 523934.05 – SCU: SCV II Extend Solenoid Circuit Current Low

The Selective Control Unit (SCU) has detected that the electrical current in the Selective Control Valve (SCV) II extend solenoid circuit is below the expected level when commanded to extend. This indicates a low current problem, which is typically caused by a poor electrical connection, a damaged wire in the harness, or a failing solenoid coil.

• 7720
• 7820
• 7920
• 7630
• 7730
• 7830
• 7930
• 9230
• 9330
• 9430
• 9530
• 9630

1. 1

   Visually inspect the wiring harness and connectors leading to the SCV II extend solenoid for chafing, corrosion, or loose connections

2. 2

   Inspect the area around the batteries and alternator for visible damage or debris affecting the electrical system

3. 3

   Check fuse F30 (specifically on 9030 series tractors), which supplies power to the SCV I and II solenoids

4. 4

   Verify that all hydraulic hoses are correctly and securely connected

5. 5

   Restart the tractor to determine if the fault is intermittent

6. 6

   Perform the 'SCU – SCV II Extend Solenoid Circuit Test' (for 9430, 9530, and 9630 tractors) using a multimeter to check for proper voltage and resistance at the solenoid and through the wiring harness

1. 1

   Isolate the fault

   Perform the 'SCU – SCV II Extend Solenoid Circuit Test' to determine if the issue lies with the solenoid itself, the wiring, or the SCU.

2. 2

   Repair the wiring

   If the wiring is found to be faulty, repair the damaged section or replace the harness.

3. 3

   Replace the solenoid

   If the solenoid is identified as the problem, relieve hydraulic pressure, disconnect the electrical connector, and physically remove and replace the solenoid valve or coil.

4. 4

   Replace the SCU

   In the rare case that the SCU itself is faulty, replace it and have it reprogrammed by a certified technician.