3-20 ENGINE CONTROL SYSTEM
Throttle
valve
CTP switch
Linkage lever
Throttle lever
IAC valve silencer
Throttle body
IAC valve
(Plunger)
Silencer cover
Flame arrester
Silencer
MAP sensor
By-pass air screw
By-pass air passage
(Surge tank)
Intake manifold
IAC passage
AIR FLOW
AIR INTAKE COMPONENTS
Air, after entering through the silencer, passes through the throttle body and flows into the surge tank where
it is then distributed to the cylinder intake manifold.
Intake manifold pressure, monitored by the MAP sensor, is an indirect measure of the intake air amount.
When the throttle is fully closed, the main supply of intake manifold air necessary to sustain the engine idle
passes through the by-pass air passage.
To maintain the engine idle speed at the specification, the ECM controlled the IAC valve supplies a regulated
amount of additional air through the IAC (idle air control) passage.
THROTTLE BODY
The throttle body adjusts the intake air amount with the throttle
valve which is connected to the throttle / linkage lever. The CTP
(closed throttle position) switch is installed on the bottom of the
throttle body. The CTP switch informs of a throttle valve position.
NOTE:
Do not try to adjust or remove any of the throttle body compo-
nent parts (CTP switch, throttle valve, throttle / linkage lever, etc.).
These components have been factory adjusted to precise speci-
fications.
To Next Page
Loading...
Need help?
General
