Reason:

(1) Abnormality of the duct.

(2) Dust has accumulated on the sensor attached to the relay duct.

(3) Failure of the air flow sensor.

Solution:

(1) If the duct is deformed or torn, it must be replaced.

　In case of blockage, remove dust and other foreign matter

　If disconnected, reconnect.

(2) Clean the sensor with a soft brush to remove dust.

　Be careful not to damage the sensor.

(3) The air flow sensor needs to be replaced.