RPT 000190.31 – Engine Speed Sensor, Malfunction

RPT 000190.31 (RPT 190.31)

Code: 000190.31

Shortcode: 190.31


This diagnostic trouble code, RPT 000190.31, is triggered when the ECU control software detects an open circuit to the engine speed sensor. A transmitted replacement value generates this diagnostic trouble code in the RPT control software. When active, this fault also generates a diagnostic trouble code in the ECU control software, which takes priority over the RPT code.


When this error is detected, the functionality of the control software is significantly limited or entirely non-functional. This affects the overall performance of the equipment, leading to reduced efficiency or operational capability.


Inspect Engine Speed Sensor Wiring:

  • Check the wiring to the engine speed sensor for signs of an open circuit.
  • Repair or replace any damaged wires or connectors.

Verify Sensor Connections:

  • Ensure all connections to the engine speed sensor are secure and free from corrosion or damage.
  • Reconnect any loose wires and clean any corroded connectors.

Test Sensor and Circuit:

  • Use diagnostic tools to test the engine speed sensor and the associated circuit for continuity and proper operation.
  • Replace the sensor if it is found to be faulty.

Update Control Software:

  • Ensure that both the ECU and RPT control software are updated to the latest versions.
  • Apply any available patches or updates that address sensor circuit issues.

Consult Technical Support:

  • If the issue remains unresolved, consult with technical support or the equipment manufacturer for further assistance.
  • Provide detailed diagnostic information to help identify the root cause.

Monitor System Performance:

  • After making the necessary repairs, monitor the system to ensure the fault does not recur.
  • Keep detailed logs of any further issues to aid in ongoing diagnostics.


The detection of an open circuit in the engine speed sensor circuit emphasizes the need for thorough inspections and maintenance. Ensuring all components and connections are in good condition can prevent such malfunctions.

Control Units: John Deere

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