Van or flap air flow sensor/meter (AFM)

The Van Air Flow Meter provides the ECM with an accurate measure of the load, placed on the engine .
The ECM uses it to calculate basic injection duration and basic ignition advance angle.
Van Air Flow Meter consists of following components:

• Measuring plate.
• Compensation plate.
• Returning spring.
• By pass Air passage.
• Idle adjustment screw.
• Fuel pump.
• Intake air temperature sensor.

The Potentiometer inside the AFV provides a variable voltage signal to the ECU.

VAN ANGLE	VOLTAGE OUT
0 degree	5.8V
20 degree	3.8V
35 degree	2.90V
50 degree	2.20V
60 degree	1.83V
75degree	1.69V

Now plot your result on the graph.

Are your results within the manufacturers specifications why or why not?

Yes it has matched with manufacturer specification .
Van angle close specification 1.6 volts+- 0.5 volt.
Test 0.5 volt
At 90 degree specification 2_4 volts
Test result is 5.8 volts.

Explain it is internal operation and why your voltage change ?

This sensor converts the air flow meter van opening angle to a voltage and send it to the ECU.
This signal allows the ECU to determine the volume of air that is entering to the engine.