John Deere 524105.02 – ACU / AIC: SCV II Control Lever Switch/Sensor Circuit Conflict

There is a discrepancy between the physical position of the Selective Control Valve II (SCV II) control lever switch and the voltage readings coming from its sensor, causing the System Control Computer (SCC) to disable SCV II to prevent unintended hydraulic operations.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7630
• 7730
• 7830
• 7930
• 7720
• 7820
• 7920
• 7185J
• 7195J
• 7205J
• 7210J
• 7225J
• 8130
• 8230
• 8330
• 8430
• 8530
• 8310RT
• 8335RT
• 8360RT
• 9230
• 9330
• 9430
• 9530
• 9630

1. 1

   Attempt system recovery by setting the SCV II lever to the neutral position, cycling the PTO switch, and restarting the engine to see if the system recovers.

2. 2

   Conduct a visual inspection of the SCV II control lever switch and the corresponding sensor for mechanical wear, physical damage, or misalignments.

3. 3

   Check all wiring and connections related to the SCV II switch and sensor for loose connections, corrosion, or damaged wires that could impact signal integrity.

4. 4

   Utilize diagnostic tools to measure and record voltage levels when the SCV II lever is moved through various positions to verify whether the sensor accurately tracks the switch's movements.

1. 1

   Recalibrate the System

   If the wiring is intact, attempt to recalibrate or adjust the sensor and switch to align their outputs. Ensure both components are properly synchronized according to the manufacturer's specifications.

2. 2

   Replace Faulty Components

   If recalibration fails or the sensor/switch is physically worn out, remove the armrest console panel to access the SCV control module and replace the faulty SCV II switch/lever assembly.

3. 3

   System Reset

   After installing the new component, reset the control system to clear any fault states.

4. 4

   Functional Testing

   Perform a comprehensive test to ensure that SCV II is functioning correctly and that the mechanical positions of the lever accurately match the sensor outputs.