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.