Buick Excelle Air Flow Meter | Malfunction Symptoms of Buick Excelle Air Flow Meter

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What is the data from the Buick Excelle air flow sensor? The air flow sensor data of Buick Excelle is usually in the range of 10 to 12. Automobile air flow sensor, also known as air head and flow meter, is one of the key sensors in electronic fuel injection engines and plays a crucial role in the operation of automobiles. The working principle of an air flow sensor is to convert the intake air flow into an electrical signal, and then send it to the engines electronic control unit (ECU). This signal is one of the basic criteria for determining the fuel injection quantity, therefore the air flow sensor has a significant impact on the performance and economy of the engine. In order to ensure the normal operation and optimal performance of the engine, the air flow sensor must provide accurate and reliable signals. If the sensor malfunctions or inaccurate data is provided, it may lead to a decrease in engine performance, poorer fuel economy, and even other issues. Therefore, for Buick Excelle owners, regular inspection and maintenance of the air flow sensor is very important. If abnormal sensor data or malfunction symptoms are found, timely maintenance or replacement should be carried out to ensure the normal operation of the engine and the good performance of the vehicle.

2. Fault phenomenon of Buick Excelle air flow meter

The mass air flow sensor used in the car is a hot wire air flow meter (MAF).

. The hot wire MAF sensor uses a hot wire resistor element, which, together with a temperature compensation resistor, a precision resistor, a bridge resistor, and an ambient temperature sensor, forms a Wheatstone bridge. The hot wire resistor element is heated above the ambient temperature, and when the air e Buick Excelle air flow meter

ntering the throttle body flows through the MAF sensor, some of the heat is taken away. The larger the air flow rate, the more heat is taken away. In order to maintain a constant temperature between the hot wire resistor element of the MAF sensor and the ambient temperature, additional resistance is required to heat the hot wire resistor element. The MAF sensor determines the magnitude of air flow by measuring the voltage drop of the current. Due to the conversion of the output signal of the air flow meter into frequency, the MAF sensor signal received by PCM has high resolution and good performance. The hot wire MAF sensor is a three wire type, and the control circuit is shown in Figure 2, installed in the intake manifold. The MAF sensor measures the amount of air entering the engine cylinder through the MAF sensor within a given time. PCM uses air quality flow information to monitor the operating status of the engine. A low air quality entering the engine indicates that the vehicle is in a deceleration or idle state due to fiber deficiency. The frequency signal provided by the MAF sensor can be monitored using instruments such as TECH-2. The frequency variation range is from around 2000Hz at idle to around 8000Hz at maximum engine load. When the difference between the air flow rate represented by the signal from the MAF sensor and the predicted value based on atmospheric pressure, throttle position, and engine speed reaches 6-30g/s, PCM will set fault code P0101 (poor performance of the MAF sensor); When the frequency of the MAF sensor signal is less than 1200Hz for more than 0.5s, PCM sets fault code P0102 (MAF sensor circuit low frequency); When the reading time of the MAF sensor signal frequency>11500Hz reaches 12 s

Buick Excelle Air Flow Meter | Malfunction Symptoms of Buick Excelle Air Flow Meter

2. Fault phenomenon of Buick Excelle air flow meter

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