Mass Air Flow sensor HOT FILM

Hot film type sensors only need to measure a ____________ of intake air flow to calculate the total air volume.

• small portion

• fixed portion

• large portion

• hot sample

A diffuser ensures that the air flow in the measuring tube is?

• separated

• hot

• cold

• unifiorm

Once the engine is started and running, the air sample in the serpentine tube flows over the ____ and hot film, which houses ____, the heating element and ____.

(select all that apply)

• IAT sensor

• diffuser

• thermistor 1

• thermistor 2

Hot film mass sensors have a serpentine channel formed as part of the sensor housing that the intake air must follow before measurement can take place.

• True

• False

The hot film sensor deflector lip causes a(n) ____ action in the serpentine channel.

• surging

• atmospheric

• high pressure

• venturi

It's essential for the intake air mass to be precisely measured to provide specific ____ .

• exhaust analysis

• Coolant temperature control

• fuel mixture control

• catalyst efficiency

Second generation hot film air mass sensors are able to recognise reverse air flow or the direction of intake air charge.

• True

• False

Return air flow through the sensor is caused by?

• combustion of air/fuel mixture

• exhaust pulsations

• shutting of intake valves

• shutting of exhaust valves

As air enters the sensor inlet, it is influenced by a ____ formed into the housing.

• Intake air temperature sensor

• deflector lip

• thermal element

• serpentine channel

Which components of the "Hot film sensor" are used to detect the reverse air flow?

select all that apply.

• Intake air temperature sensor

• Heating resistor

• Thermistor 1

• Thermistor 2