Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 02. FUEL INJECTION (FUEL SYSTEM) 02. Air Line
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W1860BE.book Page 3 Tuesday, January 28, 2003 11:01 PM
AIR LINE
FUEL INJECTION (FUEL SYSTEM)
2. Air Line
A: GENERAL
The air filtered by the air cleaner enters the throttle body where it is regulated in the volume by the
throttle valve and then enters the intake manifold. It is then distributed to each cylinder where the
air is mixed with fuel injected by the injector. During idling operation, air flows into the cylinder
through the idle air control solenoid valve, bypassing the throttle valve. This enables controlling the
engine idling speed properly.
B: MANIFOLD ABSOLUTE PRESSURE SENSOR
The manifold absolute pressure sensor is mounted on the top of the throttle body and measures the
absolute air pressure in the intake manifold.
The measured pressure is converted into an electrical signal and sent to the ECM. The ECM uses
these signals to control injection and ignition timing as well as the fuel injection amount.
(1) (2)
(3)
(A)
(B)
FU-01033
(1) Pressure detection area (A) Output voltage
(2) Connector (B) Input pressure
(3) Terminal
FU(H4SO)-3
W1860BE.book Page 4 Tuesday, January 28, 2003 11:01 PM
AIR LINE
FUEL INJECTION (FUEL SYSTEM)
C: INTAKE AIR TEMPERATURE SENSOR
The intake air temperature sensor is located in the air cleaner case and detects the temperature of
the intake air introduced through the air intake duct. The ECM uses the resistance signal from the
sensor to correct the fuel injection amount.
(1)
(4)
(A)
(3)
(2)
(B)
FU-00214
(1) Terminal (3) Thermistor (A) Resistance ()
(2) Connector (4) Housing (B) Intake air temperature (◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo