FUEL SYSTEM
VALVE>
Inspection of
Components
ENGINE COOLANT TEMPERATURE SENSOR
Coolant temperature
Harness
Component side
Engine coolant temperature sensor
connector
connector
I
I I
Engine
control
module
OPERATION
l
The engine coolant temperature sensor func-
tions to convert the barometric pressure to vol-
tage, and to input that voltage (as signals) to the
engine control module.
The engine control module, based upon those
signals, regulates the amount ot fuel injection
and the fast-idling speed when the engine is
cold.
l
The
power supply within the engine control
module is supplied, by way of the resistance
within the unit, to the engine coolant tempera-
ture sensor; it passes through the engine
coolant temperature sensor, which is a type of
resistor, and is grounded at the engine control
module.
TROUBLESHOOTING HINTS
if, during engine warm-up, the fast-idling speed is
not correct, or black smoke is emitted the problem
is usually a malfunction of the engine coolant tem-
perature sensor.
Note that the resistance of the engine coolant
temperature sensor decreases when the tem-
perature of the coolant increases.
l
The
engine
coolant temperature sensor terminal
voltage becomes higher when the resistance of
the engine coolant temperature sensor in-
creases, and becomes lower when the resist-
ance decreases. Consequently, the engine
coolant temperature sensor terminal voltage va-
ries in accordance with the temperature of the
coolant, becoming lower when the temperature
of the coolant increases.
TSB Revision
Summary of Contents for 1989 Galant
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