What does it mean when the small yellow engine light on the car dashboard is on?

[DeFrancisco]

There are two scenarios when the yellow engine light on the car dashboard is illuminated: 1. When the car's power is turned on, the vehicle performs a self-check. During this time, not only the yellow engine light but also other warning lights will illuminate simultaneously before turning off together. This is a normal phenomenon. 2. If the yellow engine warning light remains on after the car is started, this indicates the ECU is alerting you to an engine malfunction, which is an abnormal condition. Here is additional relevant information: 1. The engine fault signal on the car dashboard is emitted by the ECU (Engine Control Unit), which controls all electronic components of the engine, including the electronic throttle, fuel injectors, alternator, fuel pump, etc. It covers various systems such as intake, exhaust, fuel, ignition, and timing. 2. An engine is a machine that converts other forms of energy into mechanical energy. Originating in the UK, it can refer either to the power generation device alone or to the entire machine including the power unit (such as gasoline engines or aircraft engines).