Description:

Error code ECU 002791.04 is set when the EGR valve position signal falls below the minimum acceptable range, suggesting a potential fault in the valve’s position sensing mechanism or related circuitry.

Reaction:

The ECU may limit engine functionality to prevent potential damage or inefficiency caused by improper EGR valve operation.

Recommendations:

• Inspect EGR Valve and Sensor: Check the EGR valve and its position sensor for signs of mechanical failure, wear, or incorrect installation that might affect signal output.
• Test Electrical Connections: Ensure all electrical connections to the EGR valve sensor are secure and free from corrosion or damage.
• Calibrate or Replace Sensor: Calibrate the position sensor if possible; otherwise, replace it if it fails to meet specifications after testing.
• Reset ECU and Verify Operation: After making any necessary repairs or replacements, reset the ECU to clear the fault code and perform a system test to ensure the EGR valve is operating within the specified range.

Note:

Regular maintenance of the EGR valve and its sensor is critical to ensuring proper function and emission control. Addressing issues promptly can prevent more severe engine problems.