Subaru 2002 Impreza Service Manual page 56

AIR LINE
Fuel Injection (Fuel System)
F: MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR
The mass air flow and the intake air temperature sensors are integrated into a single unit. The unit
is mounted on the air cleaner case and measures the amount as well as the temperature of the
intake air.
The measured amount and temperature are converted into electrical signals and sent to the ECM.
The ECM uses these signals to control injection and ignition timing as well as the fuel injection
amount.
(1) Mass air flow and the intake air temperature
sensor unit
(2) Mass air flow sensor
(3) Intake air temperature sensor
NF0321
A: Air
FU-6