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OUTLINE OF
TCCS - System Descriptio
n
1
. FUNCTIONS OF ENGINE CONTROL SYSTE
M
EFI (ELECTRONIC FUEL INJECTION
)
An electric fuel pump supplies sufficient fuel,
under a constant pressure, to the injectors
.
These injectors inject a metered quantity of fuel
into the intake manifold in accordance with
signals from the Engine ECU
.
The Engine ECU receives signals from various
sensors indicating changing engine operating
conditions such as
:
• Manifold pressure (PIM) or
intake air volume
(VS, KS or VG
)
• Crankshaft angle (G)
• Engine speed (NE
)
• Acceleration/deceleration (VTA)
• Coolant
temperature (THW
)
• Intake air
temperature (THA)
etc
.
ESA (ELECTRONIC SPARK ADVANCE
)
The Engine ECU is programmed with data that
will ensure optimal ignition timing under any
and all operating conditions . Based on this data,
and on data provided by the sensors that
monitor various engine operating conditions,
such as those shown below, the Engine ECU
sends IGT (ignition timing) signals to the igniter
to trigger the spark at precisely the right instant
.
• Crankshaft angle (G
)
• Engine speed (NE
)
• Manifold pressure
(
PIM) or intake air volume
(VS, KS or VG
)
• Coolant temperature (THW)
etc
.
Igniter and ignition coi
l
These signals are utilized by the Engine ECU to
determine the injection duration necessary for
the optimal air-fuel ratio to suit the present
engine running conditions
.
Fue
l
+
Engine
EC
U
Sensor
s
OHP 3
Sensor
s
OHP
3
8
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