ACU 524104.02 – SCV III Lever Switch and Sensor Voltage Mismatch

ACU 524104.02 (ACU )

Code: 524104.02



This error code, ACU 524104.02, occurs when there is a conflict between the position of the SCV III (Selective Control Valve III) control lever switch and the voltage readings from its sensor. This discrepancy suggests a misalignment in signal transmission or a fault within the switch or sensor that could affect hydraulic operations.


Due to the potential for incorrect hydraulic actions resulting from this conflict, the System Control Computer (SCC) has disabled the SCV III to prevent unintended machinery movements and ensure operational safety.


  • Inspect the SCV III control lever switch and the corresponding sensor for any signs of physical damage, wear, or electrical malfunction that could be causing the voltage mismatch.
  • Measure the voltage outputs when the SCV III lever is in various positions to verify whether the sensor accurately reflects the switch’s settings.
  • Check all wiring and connections related to the SCV III switch and sensor for any issues such as loose connections, corrosion, or damaged wires that could be impacting signal integrity.
  • Recalibrate or adjust the sensor and switch to align their outputs. Ensure both components are properly synchronized according to the manufacturer’s specifications.
  • If recalibration does not resolve the issue, consider replacing the faulty switch or sensor to restore proper function. Make sure any new components are correctly installed and integrated into the control system.


Proper synchronization between mechanical switches and electrical sensors is crucial for the accurate operation of hydraulic controls. Regular maintenance and diagnostics are recommended to detect and correct any discrepancies early, thus maintaining the reliability and efficiency of the machinery’s hydraulic system.