E. C. C. S. DESCRIPTION
E.C.C.S. Corn
FUEL TEMPERATURE SENSOR
The fuel temperature sensor is built into the pres-
sure regulator, and senses fuel temperature When
the fuel temperature
IS higher than the specified
level, the
E C C S control unit enriches fuel inject-
ed
Pressure regulator
Fuel temprature $ens
SEF625B
Do not remove fuel temperature sensor from pres-
sure regulator. Always replace as
an assembly.
DETONATION SENSOR (VG30ET engine only)
The detonation sensor
is attached to the cylinder
block and senses engine knocking conditions
A knocking vibration from the cylinder block is
applied as pressure to the piezoelectric element
This vibrational pressure
IS then converted into a
voltage signal which is delivered as output
Reed plate ,, ,-Weight
rTerminal
-.
Piezoelectric element
SEFSZSB
/-
FUEL INJECTOR
The
fuel injector is a small, precision solenoid
valve As the
E C C S control unit outputs an in-
lnents (Cont’d)
jection signal to each fuel injector, the coil built
into the injector pulls the needle valve back, and
fuel
is injected through the nozzle to intake mani-
fold The amount of fuel injected
is controlled by
the
E C C S control unit as an injection pulse
duration
<-Nozzle
LNeedle valve
SEF627B
POWER TRANSISTOR
The ignition signal from the
E C C S control unit
is amplified by the power transistor, which con-
nects and disconnects the coil primary circuit to
induce the proper high voltage in the secondary
circuit
SEFSZBB
IGNITION COIL
The ignition coil
IS a mold type
EF & EC-17
EXHAUST EMISSION CONTROL SYSTEM
-Intake Manifold Vacuum Control-
The vacuum control valve is provided to reduce the
engine lubricating oil consumption when the intake
manifold vacuum increases to
a very high level
during deceleration
The vacuum control valve senses
the manifold
vacuum.
As the manifold vacuum increases beyond
the specified valve, the valve opens and
air IS
sucked into the intake manifold
,-intake collecior
\'I
vacuum COntiOl vaivel
A A C valve or de-up rolenoid valve housing
SEC303A
- Catalytic Converter
The exhaust gas contains unburned, harmful gases
While the mixture ratio
is maintained to the
stoichiometric point by the mixture ratio feedback
system, the three-way catalytic converter activates
to oxidize and reduce harmful
gases (HC, CO and
NO.<) into harmless gases (CO,, H, 0 and N2 1 In
this way, the catalytic converter cleans the exhaust
gas and emits CO,, H,O and N, into the at-
mosphere
E ( C S Control unit? yThree-way catalytic Converter
'h
Exhsurt gar renror,
Hydrocarbon Carbon monoxide nltrogen oxide
Carbon dioxide gar. nitrogen gas, water
SEC304A
EF & EC-75
