What does it mean when the ECU light is on?

[MacLouis]

The ECU light being on indicates a code error prompt from the vehicle's onboard computer. The ECU generally has self-diagnosis and protection functions. When a system failure occurs, it automatically records the fault code in RAM and adopts protective measures to read substitute programs from the aforementioned inherent programs to maintain engine operation. At the same time, these fault messages will be displayed on the dashboard and remain lit, allowing the owner to detect the problem in time and drive the car to the repair shop. Additional information: 1. Content 1: The operating voltage range of the ECU is generally 6.5-16V (with a voltage regulator device at key internal points), the operating current is 0.015-0.1A, and the operating temperature is -40℃ to 80℃. It can withstand vibrations below 1000Hz. 2. Content 2: The probability of ECU damage is very small. In the ECU, the CPU is the core component, which has the function of calculation and control. When the engine is running, it collects signals from various sensors, performs calculations, and converts the calculation results into control signals to control the operation of the controlled objects.