ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR-CD (RF Turbo)]

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Note
•  Perform the following test only when directed.

Resistance Inspection

1.  Remove the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

2.  Place the ECT sensor in water with a thermometer, and heat the water gradually.

3.  Measure the resistance between the ECT sensor terminals using an ohmmeter.

•  If not as specified, replace the ECT sensor.
•  If ECT sensor is okay, perform the “Circuit Open/Short Inspection”.

Specification

Water temperature (°C {°F})

Resistance (kilohm)
20 {68}
2.21—2.69
80 {176}
0.29—0.34

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Circuit Open/Short Inspection

1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

2.  Inspect for open/short circuit in the following wiring harnesses.

•  If there is open/short circuit, repair or replace wiring harness.

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Open circuit

•  ECT sensor terminal A and PCM terminal 51
•  ECT sensor terminal B and PCM terminal 70


Short circuit

•  ECT sensor terminal A and power supply
•  ECT sensor terminal A and body ground
•  ECT sensor terminal B and power supply