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2016 – MX-5 – Engine

ENGINE COOLANT TEMPERATURE (ECT) SENSOR [SKYACTIV-G 2.0]

Outline

• Two ECT sensors have been adopted for the engine control and PCM on-board diagnostic.

  Two ECT sensors have been adopted for the system diagnosis of the engine cooling system by the engine control and PCM.

Purpose

• Detects the engine coolant temperature as basic information for mainly determining the fuel injection amount.

Function

• The detection accuracy of the following is improved by comparing each input signal from the ECT sensors positioned in the water outlet case and the lower radiator hose.

• ECT sensor malfunction

• Thermostat malfunction

ECT sensor characteristic

Construction

• ECT sensor is located on the water outlet case and lower radiator hose.

  

• A thermistor has been adopted for the detection part of the ECT sensor.

  

• A thermistor is a resistor element in which changes in the electrical resistance is large against temperature change. Using this characteristic, the sensor detects the engine coolant temperature as a resistance value.

Operation

1. The ECT sensor detects (1) the engine coolant temperature.

2. The PCM detects (2) the engine coolant temperature by the voltage from the ECT sensor.

Fail-safe

ECT sensor No.1

DTC No.	Fail-safe function
P0117:00	Fixes the water temperature for the engine control at 40 °C {104 °F}, and for the idling air control at 80 °C {176 °F}. Operates the cooling fan (high speed rotation). Inhibits the fuel cut control during shift change.
P0118:00	Fixes the water temperature for the engine control at 40 °C {104 °F}, and for the idling air control at 80 °C {176 °F}. Operates the cooling fan (high speed rotation). Inhibits the fuel cut control during shift change.

ECT sensor No.2 (U.S.A. and CANADA)

• Not applicable

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