Description:

Error code ECU 000174.04 is triggered when the input voltage for the fuel temperature sensor falls below the specified minimum, indicating a possible short to ground. This fault can result in incorrect temperature readings, potentially affecting fuel system management and engine performance.

Reaction:

The engine’s fuel management system may not correctly adjust to actual fuel temperatures, leading to inefficiencies or potential engine damage.

Recommendations:

• Inspect Wiring and Connections: Check the fuel temperature sensor’s wiring for any signs of damage or grounding issues.
• Test Sensor and Circuit Voltage: Use a multimeter to measure the voltage at the sensor to confirm it is within the specified range.
• Repair or Replace Damaged Components: Fix or replace the sensor or wiring as necessary to restore proper voltage levels.
• Reset ECU and Recalibrate Sensor: After repairs, reset the ECU to ensure it accurately processes the corrected sensor signals.

Note:

Maintaining accurate sensor inputs is crucial for the optimal performance of the engine’s fuel management system. Regular checks can prevent misdiagnosis and ensure the longevity of engine components.