ACU 524103.04 – Low Voltage in SCV IV Control Lever Sensor

ACU 524103.04 (ACU )

Code: 524103.04



This error code, ACU 524103.04, indicates that the voltage within the SCV IV (Selective Control Valve IV) control lever sensor circuit is registering below the expected threshold. Low voltage levels can signify issues such as a depleted power source, faulty wiring, or a malfunctioning sensor, which could impact the accuracy of the lever’s position readings.


Due to the critical nature of accurate sensor feedback for hydraulic control, the System Control Computer (SCC) has disabled the SCV IV to prevent incorrect operation and potential system failures.


  • Check the SCV IV control lever sensor and its associated circuitry for signs of electrical wear or damage that could be contributing to the low voltage readings.
  • Use a multimeter to measure the voltage output at the sensor to confirm that it falls below the normal operating range, and identify specific points of failure within the circuit.
  • Inspect all related wiring and electrical connections for looseness, corrosion, or breaks that could be affecting the voltage levels.
  • Evaluate the overall power supply to the sensor, including batteries and alternators (if applicable), to ensure they are delivering adequate power.
  • If necessary, replace the sensor or repair any defective electrical components discovered during the diagnostic checks. After replacing or repairing, recalibrate the system to ensure the new components function correctly within the overall hydraulic system.


Regular electrical maintenance and monitoring are essential to maintain the operational integrity of hydraulic controls. Addressing low voltage issues promptly helps ensure reliable machinery performance and prevents larger system malfunctions.