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『Testing of Air Flow Meter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. How to judge the quality of a car air flow meter
1. Detection of wing type air flow meters There are two types of wing type air flow meters: 5-wire and 7-wire. The 5-wire wing type air flow meter does not have an oil pump switch inside, while the 7-wire wing type air flow meter has an oil pump switch inside. Names and functions of each terminal.
2、 The detection of hot film air flow meter: Hot film air flow meter has low manufacturing cost, long service life, and is widely used. Santana Era Superman, SGM Buick and other cars all use this type of air flow meter. Symptoms of a broken car air flow meter include shaking at idle, high fuel consumption, weak performance at high speeds, and black smoke from the exhaust pipe. Inspection and analysis: After testing with a fault diagnosis instrument, it was found that the data block of the engine air flow meter exceeded the standard severely. The reason for the damage of the air flow meter was often due to the use of inferior air filters or the failure to regularly and carefully grind and replace the air filters, which caused dust to stay on the hot wire of the air flow meter bucket for too long, resulting in inaccurate or ineffective changes in its resistance value. In addition, dust can cause the throttle body to be too dirty.
2. How to detect an air flow meter
The methods for detecting an air flow meter mainly include the following two points: ruler clearance resistance test: Purpose: Resistance test is mainly used as an auxiliary test to detect the conductivity of the air flow meter harness.
. Process: By measuring the resistance value of the wiring harness, confirm whether the wiring harness is unobstructed, without any open or sh
3. Function and detection method of engine air flow meter
The function of engine air flow meter is mainly to measure the amount of air entering the engine, and convert this information into an electrical signal to transmit to the electronic control unit.
. The ECU determines the fuel injection amount of the engine based on this signal, ensuring efficient operation of the engine. There are several main detection methods: voltage measurement method: using a multimeter to measure the output voltage of the air flow meter, by comparing it with the standard voltage range, it can be determined whether its operation is normal. Frequency measurement method: For air flow meters that use frequency signal output, an oscilloscope can be used to measure their output frequency to determine their working status. Data flow reading method: Use a car diagnostic instrument to read the air flow meter data in the engine control unit