MASS AIR FLOW (MAF) SENSOR CONSTRUCTION/OPERATION


BHE014013215T02

• Installed on the air hose.

1
MAF/IAT sensor
2
Illustration shows 13B-MSP (High power)

• Built into the IAT sensor.

1
Intake air
2
Air thermometer
3
Hot wire

• Converts the mass intake airflow amount into a voltage.

• When the heating element is placed in the air, the heat is dissipated by the air cooling the heating element. If there is a large volume of air circulating around the heating element, the amount of heat that is dissipated increases. This heat transfer utilizes the voltage which is changed by the heat transfer phenomenon.

1
B+
2
Air thermometer
3
Control circuit
4
Voltage
5
MAF sensor
6
Current
7
Hot wire
8
PCM
9
CPU
10
MAF sensor output voltage characteristic
11
High
12
Voltage
13
Low
14
Low
15
Intake air amount
16
High