GF07.07-P-4118-02G Hot Film Mass Air Flow Sensor, Function

GF07.07-P-4118-02G Hot Film Mass Air Flow Sensor, Function
- with CODE (494) USA version
- with CODE (807) Model year 1997
- with CODE (808) Model year 1998
- with CODE (498) as of Model Year 97 Japan Version






The electronics in the hot film mass air flow sensor controls the temperature of the heating resistor (RH) by means of a variable voltage so that its temperature is 160 degrees C above the intake air temperature detected by the temperature resistor (RL).

The temperature of the heating resistor (RH) is detected by the sensor resistor (RS). If a temperature change occurs as a result of an increased or reduced air flow, the electronics adapts the voltage at the heating resistor (RH) until the temperature difference is again achieved.

This control voltage is used by the engine control unit as a measure for the metered air mass.

The intake air temperature is detected by an additional NTC resistor.