Mitsubishi Eclipse. Technical Information Manual (1994) — part 24
1-74
ENGINE <TURBO> Control System
ACTUATORS AND CONTROL
FAN MOTOR RELAY (RADIATOR AIR CONDITIONING CONDENSER)
This relay controls the radiator fan and air
control module.
ing
fan based on signals from the engine
GENERATOR G TERMINAL
N71
The engine control module limits the generator
put current by duty control of the continuity between
generator terminal G and the ground.
Trio diode
- - - - - - - -
c o i l
.
Field
I
coil
I
I I
I
L
Voltage regulator
Generator
terminal voltage: 14.4 V or more
Engine control module
When there is no continuity between generator
minal G and the ground (let this be 100% duty),
transistor No. 1
stays in the always ON state.
When the voltage at generator terminal S reaches
14.4 V, the power transistor is forced to OFF to
adjust the generator output voltage to 14.4 V. This
operation is the same as that of the conventional
generator.
ENGINE <TURBO> Control System
Voltage regulator
Generator
S terminal voltage: 12.3 V or more
Engine control module
When generator terminal G is short-circuited to the
ground (let this be 0% duty), the
stays in the
always OFF state. In this case, when the voltage
at generator terminal S reaches 12.3 V, the power
transistor is forced to OFF to adjust the output
age to 12.3 Since the voltage is lower than
charged battery voltage, practically no current flows
from the generator.
ENGINE
Control Svstem
COOLING FAN CONTROL
This sytem is similar to the one introduced on the
1994
Two transistors inside the engine control module
control the radiator fan and the air conditioning con-
denser fan motor according to the engine coolant
temperature and the vehicle speed. When the air
conditioning switch and air conditioning pressure
switch are ON, the fan motor rotate at high speed
regardless of the engine coolant temperature and
vehicle speed.
l
When the engine coolant temperature is faulty,
the fan motors (radiator and condenser) are
driven at high speed.
The engine control module also controls the
fan suitable to the various driving conditions
cruising, accelerating and decelerating, etc.
Ignition switch
Battery
Radiator
fan motor
relay
Radiator
fan motor
relay
relay
,
(Low speed
transistor)
(High speed
transistor)
ECM
Engine coolant
Sensor
.
Throttle position sensor
.
Closed throttle position switch
.
Crankshaft position sensor
.
Vehicle speed sensor
.
Air conditioning switch
.
Air conditioning pressure switch
.
ENGINE <TURBO> Control System
1-77
GENERATOR CURRENT CONTROL
During the period the engine is in operation, the
engine ECM achieves duty control of the continuity
between generator terminal G and the ground. (In
this case, the OFF duty of terminal G is controlled
to equal the ON duty of the power transistor in the
voltage regulator.)
Operation of the headlights causes a sudden in-
crease in current consumption, but the engine ECM
suppresses a sudden increase in the generator out-
put current, thereby preventing the sudden in-
creases in electric load from abruptly reducing the
engine speed while the engine is running at idle.
(During the period before the generator generates
enough power, the battery current is additionally
supplied to the headlights, etc.) During the period
of approximately 0.5 seconds after the power steer-
ing pressure switch has been set to ON and also
during the period of approximately 0.5 seconds after
the selector lever has been changed over from the
N range to the D range, the engine ECM controls
generator terminal G in terms of 30% OFF duty
to suppress generation of power by the generator.
ECM
Engine coolant temperature sensor
Crankshaft position sensor
D
Air conditioning switch
D
Power steering pressure switch
D
Ignition switch-ST
D
Under the following conditions, however, this control
is not achieved.
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High engine speed
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Engine coolant ternperature 50°C or lower
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Air conditioner
ON
l
More than 0.5 seconds after the power steering
pressure switch has been set to ON
More than 0.5 seconds after the selector lever
has been changed over from “N” to “D”
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Three seconds or less after the engine has been
started
When a high signal at generator terminal FR lasting
for more than 20 seconds is input to the engine
ECM during operation of the engine, the engine
ECM determines that the generator terminal FR
circuit has been open-ciircuited and stores diagnostic
trouble code (No.
in memory, and places
generator terminal G the always OFF state.
Generator G terminal
Generator FR terminal
FR G
Generator
1
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