Detection method of automobile air flow sensor

1. By measuring the output voltage data when the engine is running, it can be judged that the standard voltage of the letter signal terminal of the plug and the engine at idle speed is 0.8-1.4v; When accelerating to full load, the voltage signal can be close to 4V. If it is not within this range, it may be that the air flow sensor itself is damaged, or it may be caused by dirty things. Just clean it.

2. It can be judged by measuring the output voltage of the sensor: use a multimeter to detect, the general voltage value is 5V, and use a blower to blow air into the sensor. It is normal if the voltage changes with the amount of intake air; If there is no change or little change, the flowmeter is faulty and needs to be replaced.