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2008 - MX-5 - Engine

ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [LF]

NOTE:

Resistance Inspection

1. Remove the battery cover.
2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].)
3. Disconnect the ECT sensor connector.
4. Remove the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [LF].)
5. Place the ECT sensor in the water and while increasing the water temperature, measure the resistance between ECT sensor terminals A and B.
Standard

Water temperature

(°C {°F})

Resistance (kilohm)

20 {68}

35.48—39.20

80 {176}

3.65—4.02


Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [LF].)
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
Open circuit
Short circuit


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