Honda LEAD 110 2009 Service Manual page 51

TECHNICAL FEATURES
ECT SENSOR
• ECT sensor detects engine coolant temperature.
• ECT sensor consists of a thermistor that varies its resistance value according to changes of temperature.
• ECT sensor detects the changes of engine coolant temperature by converting them into the changes of thermistor's
resistance values. ECM receives the output signal from the sensor as variable voltages.
• Output voltage into ECM is high when engine coolant temperature is low. The voltage becomes lower as temperature
increases.
• Depending on output voltage, ECM corrects discharge duration corresponding with engine coolant temperature.
ECT SENSOR
from WATER TEMPERATURE METER
OUTPUT
VOLTAGE
4.54V
0.43V
° °
-20 -20 C C
2-14
ECM
5V
OUTPUT
VOLTAGE
THERMISTOR for ECM
ENGINE
COOLANT
TEMPERATURE
°
100 C
ECT SENSOR
THERMISTOR for WATER TEMPERATURE METER