Air flow meter detection

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How to detect if the air flow sensor is broken? The damage of the air flow sensor can be determined by detecting the grounding wire, power wire, and signal wire. Tools such as a multimeter and probe need to be used. The specific operation is as follows: check the grounding wire with a multimeter and calibrate it to ensure accurate measurement. Pull off the plug of the air flow meter. Set the multimeter to the beep mode, connect the black probe to the vehicle body, and measure the 5 terminals with the red probe in sequence. If a terminal path has a resistance value below 1 Ω, the wire connected to that terminal is a grounding wire. Power cord detection for 12V power cord: Turn on the ignition switch and set the multimeter to 60V. Connect the black probe to a known grounding wire, and measure the other four terminals with the red probe. If there is a 12V voltage, then this wire is the 12V power supply wire from the oil pump relay. 5V reference voltage detection: Connect the black probe to a known grounding wire, and measure the other three terminals with the red probe. If there is a 5V voltage, then this line is the 5V reference voltage line provided by the ECU. Insert the signal line back into the air flow meter control plug and start the engine to operate. Insert the probe into the control dust plug, connect the black probe to the known grounding wire of the key stove through the probe, and measure the last two wires with the red probe. Observing signal voltage: When the engine is idling, the signal voltage between the signal line and the ground is about 1.5V; as the amplitude of the accelerator pedal increases and the intake flow rate increases, the voltage also increases, and should reach 3.5V-4.5V during rapid acceleration. If there is an intake temperature signal, the voltage will increase as the temperature rises. If the measured value does not match the standard, there may be a problem with the signal line. Attention should be paid to the following items during testing: turn off the ignition switch when measuring resistance to prevent damage to the multimeter. Ensure safety when starting the engine to avoid accidents. When using a probe for detection, prevent two needles from touching each other and causing a short circuit.

2. 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.

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 ineffec

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