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Toyota COMPUTER-CONTROLLED SYSTEM

Toyota COMPUTER-CONTROLLED SYSTEM
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a
AIR INDUCTION SYSTEM
EFI - Air Induction Syste
m
This system supplies the air necessary for
combustion to the cylinders
. Air passes through
the air cleaner, then through the air flow meter
(in L-type EFI only), the throttle body, the air
intake chamber, and the intake manifold, then is
fed into each cylinder
. In an EFI engine,
releasing the accelerator pedal closes the
throttle valve fully, so during idling or fast
idling, air bypasses the throttle valve and is
taken directly into the cylinders via the bypass
passage in the throttle body or ISC valve
.
AIR
CLEANER
AIR FLOW
METER
(L-type EFI)
THROTTLE
BOD
Y
AIR VALVE
and/o
r
ISC VALV
E
Air cleane
r
N
When the coolant temperature is low, the air
valve opens and air passes through it (in
addition to passing through the throttle body as
usual) and enters the air intake chamber
. This
extra air raises the idle speed to aid in engine
warm-up
.
In engines equipped with some types of ISC
valves, the above is performed not by an air
valve, but by the ISC valve
. Please refer to the
section on the ISC system (see page 99)
.
AIR INTAKE
CHAMBER
INTAKE
MANIFOL
D
Thro
tt
le bod
y
Bypass passage Idle speed adjusting scre
w
Air valv
e
D -
TYPE
EFI (engine without ISC valve
)
Air flow mete
r
N
Air
intake
chambe
r
4
r
OHP 5
2
CYLINDER
S
Idle speed adjusting screw
(Some models only
)
L -TYPE EFI (
engine
with ISC valve)
OHP 52
64

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