ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [WLT-1, WLT-2]

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Note
•  Perform the following test only when directed.

1.  Drain the engine coolant from the radiator. (See ENGINE COOLANT REPLACEMENT [WLT-1, WLT-2].)

2.  Disconnect the ECT sensor connector.

3.  Remove the ECT sensor.

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

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5.  Measure the resistance between the ECT sensor terminals A and B using an ohmmeter.

Specification

Engine coolant temperature (°C {°F})

Resistance

(kilohm)
20 {68}
2.27—2.73
80 {176}
0.29—0.34

6.  If not as specified, replace the ETC sensor.

7.  Refill the radiator with the specified engine coolant. (See ENGINE COOLANT REPLACEMENT [WLT-1, WLT-2].)

8.  Install the ECT sensor.

Tightening torque
16—23 N·m {1.6—2.4 kgf·m, 12—17 ft·lbf}

9.  If ECT sensor is normal, but PCM terminal E voltage is out of specification, inspect as follows:

Open circuit
•  Reference voltage circuit (ECT sensor connector terminal A and PCM connector terminal E through common connector)
•  Ground circuit (ECT sensor connector terminal B and PCM connector terminal B through common connector)
Short circuit
•  ECT sensor connector terminal A and PCM connector terminal E through common connector to ground

10.  Repair or replace faulty areas.

11.  Reconnect the ECT sensor connector.