Vane or flap air flow sensor/meter (AFM)
VANE ANGLE | VOLTAGE OUT |
15 | 3.76V |
30 | 2.95V |
45 | 2.45V |
60 | 1.59V |
75 | 1.39V |
90 | 0.40V |
Explain its internal operation and why your voltage changes
A van airflow sensor controls the air flowing to the engine by a spring loaded mechanical flap. The flap has a wipe arm that is connected with the variable resistor, allowing resistance and output valtage to change accroding to airflow. The variable resistor is low and increase the voltage signal to ECU. The ECU calculate how much fuel is needed to inject into cylender port.
Are your results within the manufacturer’s specifications, why or why not?
The result is within the manufacture's sepecification because when the van closes the voltage get higher and when the van opens voltage get lower.
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