Description:

Error code ECU 002659.03 is triggered when the EGR (Exhaust Gas Recirculation) flow signal exceeds the upper limit of its normal range, which suggests a short to 12 volts. This electrical fault can cause the ECU to receive inaccurately high EGR flow readings, potentially affecting the engine’s emission control and efficiency.

Reaction:

The ECU may adjust engine settings based on incorrect data, which can lead to inefficiencies, increased emissions, or other operational issues.

Recommendations:

• Inspect EGR System Wiring: Check for any signs of damage, wear, or improper connections in the wiring to the EGR flow sensor that could cause a short to power.
• Measure Voltage at Sensor: Use a multimeter to confirm if the voltage at the EGR flow sensor is indeed higher than specified, indicative of a short.
• Replace Faulty Wiring/Sensor: Repair or replace any faulty wiring or the sensor itself to resolve the issue of incorrect signal voltage.
• Test EGR System Operation: After repairs, thoroughly test the EGR system under various conditions to ensure the flow readings are accurate and within the expected range.
• Reset ECU: Clear any error codes and reset the ECU to ensure all changes are correctly implemented and the system is recalibrated.

Note:

Regular maintenance of the EGR system, including wiring and sensors, is critical to ensuring accurate monitoring and control of exhaust gas recirculation, which is vital for meeting emission standards and maintaining engine performance.