This is a negative temperature coefficient device ( NTC ) whose resistance decreases with increasing temperature. This acts as an air temperature sensor and forms part of the resistor chain that thus affects the output of the unit. There is also a thermistor ( temperature dependent resistor ) inserted into the air flow inlet. A bypass screw controls the air flow through a bypass passage when the vane is closed under idle conditions. This signal is used to control the volume of fuel injected by each fuel injector. Change in vane position displaces a potentiometer ( variable resistance ) and provides a voltage output, proportional to the volumetric air flow, to the ECU. The air flow into the inlet manifold pushes the vain against a return spring. The Bosch AFM is based on a vane obstructing the air flow. find method to measure wiper position and re-adjust factory wiper calibration. Here I will try to condense it to a more coherent account.ĭetermine whether the Bosch air flow meter ( AFM ) is defective restore functionality recalibrate rest position if moved during intervention or if recalibration is desired as a function of age, ie. The previous thread on this subject involved questions, discussions and the process of discovery of how the Bosch air flow meter ( AFM ) worked and interacts with electronic control unit ( ECU )
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January 2023
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