Description:

ECU 000105.04 is activated when the input voltage at the exhaust gas recirculation (EGR) mixed air temperature sensor falls below the minimum specified level, typically indicating a short to ground. This fault can lead to inaccurate temperature readings, which are crucial for the ECU to manage the EGR system effectively.

Reaction:

The ECU may alter its responses based on inaccurate temperature data, potentially resulting in suboptimal combustion, increased emissions, or a drop in engine efficiency.

Recommendations:

• Inspect Wiring and Connections: Check the sensor’s wiring and connections for any signs of wear, damage, or corrosion that could lead to grounding issues.
• Test Sensor Voltage: Use a multimeter to measure the voltage at the sensor to confirm if it is below the expected range.
• Rectify Electrical Faults: Repair or replace any damaged wiring or connectors.
• Replace Faulty Sensor: If the sensor or wiring repairs do not resolve the issue, consider replacing the temperature sensor.
• Reset ECU and Clear Fault Codes: After repairs, reset the ECU and clear any fault codes to ensure the system functions correctly.

Note:

A thorough inspection of the EGR system’s electrical components is recommended to prevent recurrence. Regular maintenance helps catch such issues early, reducing the risk of engine performance problems.