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A 2010 Chevrolet Chevrolet km sport utility vehicle with a mileage of about 60 thousand and carrying a 3.2 engine. User reflection: the car engine failed to light. Inspection and analysis: maintenance personnel detect engine control unit and find fault code P0101 - air flow meter fault. When the engine idling, check the air flow rate, 2.7 g/s, normal. At this point, the engine runs smoothly, and no obvious anomalies can be seen from other data for the time being. Careful observation, finally found the problem. The throttle opening at this time is 15%. Under such a large throttle opening, the intake volume is only 2.7 g/s, which is obviously abnormal. Normally, the intake volume of this valve should be at least 10 g/s. According to the unreasonable relationship between the 2 data, the engine control unit judges the malfunction of the air flowmeter. Troubleshooting: cleaning throttle body, re observe throttle opening, 2.3, normal. Repeat the test to confirm the troubleshooting.