Description:

This error code, ECU 000412.03, occurs when the input voltage at the EGR exhaust temperature sensor exceeds the maximum specified limit, likely due to a short to 12 volts. This fault can result in inaccurate temperature readings from the sensor.

Reaction:

The ECU may respond to the erroneous data by altering EGR and engine operations, potentially affecting performance and emissions.

Recommendations:

• Inspect Sensor Wiring: Check for damaged wires or connections that might cause a short to voltage.
• Test Sensor Voltage: Measure the voltage at the sensor to confirm if it exceeds normal levels and identify the source of the problem.
• Replace or Repair Damaged Components: Repair any damaged wiring or replace the sensor if necessary.
• Reset ECU and Verify Functionality: After addressing the electrical issues, reset the ECU to ensure correct sensor operation and system functionality.

Note:

Proper sensor operation is essential for accurate monitoring and control of EGR temperatures. Electrical integrity should be maintained to prevent sensor voltage issues.