What is the ECU malfunction indicator light?

[MariaLynn]

ECU has self-diagnosis and protection functions. The illuminated ECU light indicates a code error prompt from the vehicle's onboard computer. When the system malfunctions: 1. The ECU automatically records fault codes in RAM and implements protective measures by reading substitute programs from the aforementioned inherent programs to maintain engine operation. 2. These fault messages will be displayed on the dashboard and remain lit, allowing the owner to promptly identify issues and drive the car to a repair shop. Below is relevant information about the ECU: 1. The ECU's operating voltage range is generally 6.5-16V (with voltage stabilization devices at key internal points), operating current is 0.015-0.1A, and operating temperature is -40℃ to 80℃. It can withstand vibrations below 1000Hz. 2. In the ECU, the CPU is the core component, which has computing and control functions. While the engine is running, it collects signals from various sensors, performs calculations, and converts the calculation results into control signals to manage the operation of controlled components.