The air flow sensor is the main component of the flowmeter, which affects the service life of the flowmeter. Therefore, when the airflow sensor fails, the following two points should be noted: 1. Blocking the air without measuring the access route. : The intake pipe is broken, the vacuum hose is loose, and the intake manifold and the cylinder head are not tightly sealed. If the above situation exists. Part of the air will enter the cylinder without passing through the metering of the air flow sensor, eventually resulting in engine misalignment. 2. Replacement problem after the flow sensor is damaged The air flow sensor is a faulty multi-component. After the air flow sensor is damaged, if the original parts are not found at the moment, the common interchange problem of the parts is faced. If the engine is equipped with different types of air flow sensors, the fuel injection control will be inaccurate. In the open-loop control phase, the fuel consumption of the engine may increase, and the temperature of the three-way catalytic converter is too high. In the closed-loop control phase, the oxygen sensor continuously corrects the concentration of the mixed vapor, so that the air-fuel ratio frequently changes, eventually leading to the engine. Unstable work. The faults of the air flow sensor are divided into two categories. One is that the signal is out of the specified range, indicating that the air flow sensor has failed. Modern electronically controlled vehicles have fail-safe function. When the signal of a certain sensor fails, the electronic control unit (ECU) flow-meters.cn will be replaced by a fixed value, or the signal of the other sensor will be substituted for the signal of the faulty sensor. . After the air flow sensor fails. The ECU replaces it with the signal from the throttle position sensor. The other type is signal inaccuracy (ie, performance drift). The inaccuracy of the air flow sensor signal may be more harmful than the absence of the signal. This is because. Since the signal does not exceed the specified range.
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