John Deere 524104.04 – ACU: SCV III Control Lever Sensor Circuit Voltage Low

The voltage in the Selective Control Valve (SCV) III Control Lever Sensor circuit has dropped below 0.5V. When this occurs, the SCV III function is typically disabled by the control unit as a safety precaution.

• 7185J
• 7195J
• 7205J
• 7210J
• 7225J
• 7630
• 7720
• 7730
• 7810
• 7820
• 7830
• 7920
• 7930
• 8130
• 8230
• 8330
• 8430
• 8530
• 8225R
• 8235R
• 8245R
• 8260R
• 8270R
• 8285R
• 8295R
• 8310R
• 8310RT
• 8320R
• 8335R
• 8335RT
• 8345R
• 8360R
• 8360RT
• 8400R
• 9230
• 9330
• 9430
• 9530
• 9630

1. 1

   Perform a neutral reset by setting the SCV III control lever to the neutral position to attempt a system recovery

2. 2

   Power cycle the tractor by placing it in park, shutting off the engine, and restarting it to reset communication messages. Verify if the active diagnostic trouble code reappears.

3. 3

   Visually inspect the wiring harness and connectors around the SCV III control lever in the armrest for any visual signs of damage, pinched wires, or loose connections

4. 4

   Check the ACU sensor supply voltage to ensure the sensor is receiving proper power and that the circuit is not shorted to ground

1. 1

   Disconnect battery

   Turn off the tractor, place it in park, and disconnect the battery to prevent electrical shorts.

2. 2

   Remove armrest cover

   Remove the fastening screws securing the CommandARM / armrest console cover to access the internal Armrest Control Unit (ACU) components.

3. 3

   Locate SCV III assembly

   Locate the SCV III control lever assembly and its attached potentiometer/sensor.

4. 4

   Disconnect wiring harness

   Carefully disconnect the electrical wiring harness connector from the SCV III lever sensor.

5. 5

   Remove mounting hardware

   Remove the mounting hardware (screws/brackets) securing the SCV III control lever or the individual sensor to the armrest frame.

6. 6

   Install replacement part

   Install the replacement sensor or complete SCV lever assembly and secure it with the mounting hardware.

7. 7

   Reconnect wiring

   Reconnect the electrical harness to the new sensor.

8. 8

   Reassemble console

   Reassemble the armrest console and reconnect the battery.

9. 9

   Clear codes and calibrate

   Start the tractor. Navigate through the CommandCenter display to clear the stored codes and, if required by the specific model, perform a calibration test for the new SCV lever.