ACU 524103.02 – SCV IV Lever Switch and Sensor Voltage Conflict

ACU 524103.02 (ACU )

Code: 524103.02



This error code, ACU 524103.02, arises when there is a discrepancy between the SCV IV (Selective Control Valve IV) control lever switch position and the sensor voltage readings. Such a conflict indicates that the electrical signals do not align with the mechanical position of the lever, potentially due to issues in the switch, sensor, or associated wiring.


As a measure to prevent incorrect hydraulic operations that could arise from this sensor-switch mismatch, the System Control Computer (SCC) has disabled the SCV IV function.


  • Inspect the SCV IV control lever switch and the corresponding sensor to ensure they are functioning correctly. Look for any signs of physical damage, wear, or electrical faults.
  • Test the voltage output at various positions of the control lever to determine if the sensor accurately reflects the lever’s position. Utilize diagnostic tools to measure and record these voltage levels.
  • Check all related wiring and connections for damage or loose contacts that could be causing incorrect voltage readings or signal interference.
  • Recalibrate or adjust the sensor and switch settings to ensure they synchronize accurately with the lever’s physical positions.
  • If the conflict persists after these corrective measures, consider replacing the faulty switch or sensor to resolve the issue. Ensure that any new parts are properly calibrated and integrated into the system.


Accurate coordination between control lever switches and their corresponding sensors is crucial for the precise operation of hydraulic controls. Regular checks and maintenance can help detect and correct discrepancies early, thereby ensuring the reliability and safety of machinery operations.