How Air Flow Sensor Works?

Learn how to does air flow sensor works in your car, Its really really help full to every one who have car even you have no idea about technical but reading and reading a booklet about it someday you can tell ah.ah.ah.ah.ah.ah.ah.ah.ah.ah its easy. all car especially electronic today built in a airflow sensor.

How air flow sensor works and how to check it?

Air flow sensor (AFS)

MAF uses the features of sensor heater, after HOT FILM units calculate the intake air quantity, then send the signal to ECU. ECU decides the fuel quantity and ignition timing, and recognizes up hills and helps fuel quantity and over run air conditioner compensation , idle speed actuator MAF might be combined to measure the intake air temperature.

HOT FILM AFS OUTPUT FEATURES

Mass air flow (kg/h)                                                   Output voltage(V)
            10                                                                        1.2226~1.2398
            15                                                                        1.3552~1.3778
            30                                                                        1.6783~1.7146
            60                                                                        2.1619~2.2057
          120                                                                        2.7215~2.7762
          250                                                                        3.4388~3.5037
          370                                                                        3.8796~3.9511
          480                                                                        4.1945~4.2683
          640                                                                        4.5667~4.6469

TROUBLE SHOOTING HINT

1. When ignition switch is turned on, if AFS output voltage is not 0(Engine stops), inspect the malfunction of AFS and ECU.
2. Even though AFS output voltage is abnormal, if engine is at idle, inspect the following condition.  
   1) Heck the poor attachment of airflow, cut the air duct, and air cleaner filter branched from AFS.
   2) Bad combustion in the cylinder or fault injector.
3. Even if no AFS malfunction occurs , check the mounting direction of AFS.
   
   Note:
   = Use correct voltmeter.
   = Before inspection, warming up the engine till the engine coolant temperature is up to 80 ~90*c

trouble study