The mass air flow sensor is installed between the air filter and the throttle body
In different versions of fuel injection systems, two types of mass air flow sensors can be used.
They differ in design and in the nature of the output signal, which can be frequency or analog.
In the first case, the signal frequency changes depending on the air flow, and in the second case, the voltage changes.
The ECU uses information from the mass air flow sensor to determine the duration of the injector opening pulse.
Based on the sensor signal, the ECU calculates the amount of air entering the engine cylinders.
If the mass air flow sensor malfunctions, the electronic control unit switches the system to backup mode.
If the mass air flow sensor malfunctions, there is an increase in fuel consumption, a significant deterioration in dynamics, jerks and dips, and problems with starting the engine.
Removing and installing the mass air flow sensor
You will need: a 10mm wrench, a screwdriver.
Disconnect the wire block from the sensor
Loosen the clamp securing the left side of the air supply pipe to the sensor and disconnect it from the sensor.
Using a 10mm socket, unscrew the two bolts securing the sensor housing to the air filter cover
Remove the housing with the sensor assembly
Before installing the sensor with the housing, remove the sealing sleeve from the hole in the air filter cover
Place it all the way onto the sensor body pipe
Installing the sensor and housing assembly in reverse order
If you need to remove it without the housing, then disconnect the wire block from the sensor connector
Use a Torx T20 wrench to unscrew the two screws securing the sensor to its body
Removing the mass air flow sensor
You can verify the serviceability or malfunction of the sensor only by replacing it with a known-good sensor.
Installing the sensor in reverse order