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What brand of gas flowmeter is good?
2. How to detect and solve hot wire and hot film air flow meters
Hot wire and hot film air flow meters have similar structural characteristics, that is, there is a hot wire or hot film in each intake channel. The working principle of these two sensors is also very similar, and they both need to be able to work under the condition of power supply.. Both of them convert the intake volume into the output voltage, so the detection methods of these two air flow meters are basically the same. They can be detected during engine operation or after being removed and connected to the power supply according to their working requirements. The requirements for the working power supply, wiring harness socket form, and testing standards of various models of hot wire or hot film air flow meters are not completely the same. Taking the Nissan MAXIMA sedan VG30E engine as an example, this article introduces the inspection method of the hot wire air flow meter. The hot wire and hot film air flow meters of other vehicle models can be tested using Sun Youkaos method. 1. To test the air flow meter with a multimeter, the measurement method is as follows: (1) Unplug the wiring harness plug of the air flow meter and remove it. Connect the battery voltage to the D and E terminals in the flowmeter socket (note that the power polarity should be correct), and then use a multimeter to measure the voltage between the B and D terminals in the socket. The normal voltage should be 1.6 ± 0.5 V (3). Use a nozzle or electric fan to blow air into the inlet of the air flow meter, and measure the voltage between terminals B and D. When blowing, the voltage should rise to 2-4V (Figure 3-21b) - If the
2. Use an oscilloscope to test the hot wire or hot film air flow meter. The measurement method is: (1) With the air flow meter and its harness plug installed properly, connect the oscilloscope probe to the wire connected to the B end of the harness. (2) Let the engine run, start the mountain idle state, gradually step on the accelerator pedal, increase the engine speed to medium high speed, and observe the waveform of the air flow meter output signal on the oscilloscope. The waveform of a normal hot wire or hot film air flow meter is similar to that of a wing plate air flow meter, with a diagonal line (Figure 3-19). If there is abnormal shaking, it indicates that the air flow meter is faulty.
3. How to detect air flow meters
The methods for detecting air flow meters mainly include resistance testing and voltage testing.
.1. Resistance Test Resistance test is mainly used to check the conductivity of the air flow meter harness, ensure that the harness is not open or short circuited, and that the connector is securely connected.
. Specific operation process: Disconnect power supply: Before conducting resistance testing, it is necessary to first disconnect the power supply of the air flow meter to avoid damage to the circuit during the testing process. Using a multimeter: Use the resistance range of the multimeter to measure the resistance values between each pin of the air flow meter. These resistance values should match the specifications provided by the manufacturer or fluctuate within a certain range. Check the wiring harness: If Kaipaiguo finds abnormal resistance value, further check whethe
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