John Deere 524102.04 – ACU: SCV Control Lever Sensor Voltage Low

This fault code indicates that the voltage in the Selective Control Valve (SCV) number 5 control lever sensor circuit is below the normal operational range or shorted to a low voltage source. This points to an electrical issue with the sensor, the wiring harness, or the Armrest Control Unit (ACU) power supply, which can prevent proper operation of the affected SCV.

• 7630
• 7730
• 7830
• 7930
• 7R Series
• 8R Series
• 9R Series
• 7200R
• 7215R

1. 1

   Visually inspect the wiring harness connected to the SCV control lever in the armrest for chafing, pinching, or corrosion on the connectors

2. 2

   Recycle tractor power to determine if the fault is a transient electrical issue that clears on restart

3. 3

   Check for other active fault codes related to sensor supply voltage, which could indicate a main power supply issue to the ACU rather than an isolated sensor fault

4. 4

   Back-probe the connector at the SCV lever sensor with a multimeter to measure circuit voltage (expected to be lower than manufacturer specification due to FMI 04)

5. 5

   Disconnect the SCV lever sensor and ACU connectors to check for continuity and shorts to ground on the signal wire, and inspect pins for damage

1. 1

   Isolate the fault

   Based on diagnostic checks, determine whether the fault originates from the SCV lever sensor, the wiring harness, or the Armrest Control Unit (ACU).

2. 2

   Access the components

   Partially disassemble the armrest control console to gain access to the SCV sensor and wiring harness.

3. 3

   Replace faulty components

   Replace the wiring harness if damaged. If the sensor is faulty, replace the sensor or the integrated lever assembly. If both are good, the ACU may require further diagnostics and replacement by a certified technician.

4. 4

   Clear codes and retest

   After replacing the faulty component, clear all diagnostic trouble codes and operate the SCV lever to verify the repair and ensure the fault does not return.