What does ECU internal fault mean?

[DianaLee]

ECU internal fault refers to a problem with the vehicle's computer. The causes of ECU internal faults include: 1. ECU self-failure, where the ECU's working area is damaged or malfunctions due to abnormal flashing, severe vibration, excessive temperature, etc., which may trigger an ECU internal fault; 2. Abnormal ECU working state, such as ECU overload caused by abnormal crankshaft signal leading to recovery lock, which will cause corresponding internal faults; 3. ECU internal faults caused by abnormal sensors or actuators, as the power supply for the sensors and actuators of the common rail system is provided by the ECU; 4. If there is a short circuit in the wiring harness or a short circuit to ground during power supply, the ECU will cut off this power supply for self-protection, thus reporting a sensor power supply voltage fault or actuator power supply fault.