ECU 002791.31 – Exhaust Gas Recirculation (EGR) Calibration Error. John Deere System Advisory.

ECU 002791.31 (ECU 2791.31)

Code: 002791.31

Shortcode: 2791.31

Description:

This diagnostic trouble code occurs when the ECU detects that the exhaust gas recirculation (EGR) valve cannot reach or maintain the desired position, suggesting a calibration error. Such an issue can arise from mechanical restrictions, sensor inaccuracies, or faulty control algorithms.

Reaction:

The ECU may limit engine output or modify operational parameters to avoid potential damage or excessive emissions due to improper EGR valve function.

Recommendations:

  • Inspect EGR Valve and Components: Check the EGR valve for mechanical freedom of movement and signs of wear or damage.
  • Test Position Sensors: Ensure the accuracy of sensors that report the valve’s position to the ECU.
  • Perform EGR System Calibration: Recalibrate the EGR system using appropriate diagnostic tools to align the valve’s operation with ECU control strategies.
  • Replace Faulty Parts: If recalibration does not resolve the issue, replace faulty sensors or the valve itself.
  • Verify System Operation: After repair or recalibration, thoroughly test the EGR system to ensure it operates within specifications under all conditions.

Note:

Maintaining accurate calibration of the EGR system is critical for engine efficiency, emission control, and compliance with environmental regulations.


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