After the fault display lamp goes out, the engine warm-up cycle is about 40 times, and the fault code will be automatically cleared from the memory. If the fault no longer exists, the monitor will instruct the fault display light to go out after it has not received the relevant signal for 3 consecutive times. When the car is in normal operation, the input and output signals (voltage or current) of the electronic control system of the car will change regularly within a certain range when the signal of the electronic control system circuit is abnormal and exceeds the normal variation range, And this abnormal phenomenon will not disappear within a certain period of time (3 consecutive strokes), the ECU judges that this part is faulty, the fault indicator lights up, and the monitor stores the fault in the internal RAM in the form of a code ( Random Access Memory: Random Access Memory), the stored fault code can be read by fault display light or OBD II scanner during maintenance.
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