ENGINE COOLANT TEMPERATURE (ECT) SENSOR CONSTRUCTION/OPERATION[LF, L3]


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am3zzn00000994

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ECT sensor
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Exhaust manifold

•  Installed on the water bypass tube (directly below the ignition coil).
•  The ECT is a thermistor type, the resistance changes according to the engine coolant temperature.
am3zzn00000995

1
ECT sensor
2
ECT sensor resistance characteristic
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Resistance
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Engine coolant temperature
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Large
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Small
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Low
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High

•  The resistance decreases if the engine coolant temperature increases, and increases if the engine coolant temperature decreases.