AirMan PDS400S-6C3, Service Manual

Page: 75 / 102

3. Electric System
3-37
3.18.7 Injector
The injector is installed onto cylinder head section and
is conrtolled by ECM to inject fuel. The ECM raises the
voltage for operating injectors internally, energizes to
injector, and regulates period of electric conduction of
injector to control fuel injection amount and injection
timing.
3.18.8 Engine coolant temperature (ECT)
sensor
The engine coolant temperature (ECT) sensor is
installed onto cylinder head, and the thermistor changes
the resistance according to the temperature. Resistance
is low at high engine coolant temperature and high at
low engine coolant temperature. The ECM energizes the
voltage 5V to the ECT sensor through pull up resistance,
and calculates engine coolant temperature based on
change of voltage to use for various controls such as fuel
injection and emergency stop decision etc. If the
resistance is low (temperature is high), the voltage
becomes low; if the resistance is high (temperature is
low), the voltage becomes high.
When coolant temperature rises higher than 221°F
(105
℃
), warning lamp is made to light on to bring
engine to emergency stop.
Removeal
Disconnect the connector and remove it with 0.75in.
(19mm) wrench.
Installation
Apply Loctite 572 before installing it.
：
173
－
260lbf
･
in (19.6
－
29.4N
･
m)
[200
－
300kgf
･
cm]
ISUZU part number:898156-6480
※
Engine coolant temperature sensor Hokuetsu
Industries be ordered. Used in abnormal / alarm lamp and temperature display. Refer to 3.10
Discharge Air Temperature
･
Separator Air Temperature
･
Engine Coolant Temperature Sensor.
SG09058
SG09059-1E
PC13071E
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