Characteristic curve of intake air
temperature sensor NTC resistor
Characteristic curve of
temperature sensor
Stepping motor of idle speed actuator
6. Intake air temperature sensor (4G18-3600090)
Intake air temperature sensor is a resistor with negative tem-
perature coefficient (NTC), resistance varies with intake air
temperature, and this sensor sends a voltage indicating change
of intake air temperature to controller.
Simple measuring method:
(Removing the joint) place digital universal meter at ohm gear,
and connect 2 terminals respectively to 1
#
pin and 2
#
pin of
sensor, and rated resistance at 5%, and
other corresponding resistance values could be measured ac-
cording to the characteristic curve in above drawing. Analog
method could also be applied in measurement. Use an elec-
tric blower to blow air into the sensor (pay attention not to
keep them too near), and observe the change of resistance,
which should decrease at the moment.
7. Stepping motor (4G18-3600070)
Schematic diagram and pins
Engine control system·- EFI system
Use digital universal meter to measure:
Resistance-temperature characteristics of temperature sensor
11
Temperature range(
Resistance at A and C
Resistance at B
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