ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION[L3]

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Note
•  Perform the following inspection only when directed.

ECT Sensor Resistance Inspection

1.  Drain the engine coolant. (See COOLING SYSTEM SERVICE WARNINGS[L3].)

2.  Remove the ECT sensor (located above the starter).

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

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

•  If not as specified, replace the ECT sensor.
•  If the ECT sensor is okay, but ECT PID value is out of specification, perform the “Circuit Open/Short Inspection”.

Specification

Water temperature (°C {°F})

Resistance (kilohms)
20 {68}
35.48—39.20
70 {158}
5.07—5.60
80 {176}
3.65—4.02


Circuit Open/Short Inspection

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1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION[L3].)

2.  Inspect the following wiring harnesses for open or short. (Continuity check)


Open circuit

•  If there is no continuity, the circuit is open. Repair or replace the harness.
―  ECT sensor terminal A and PCM terminal 2AK
―  ECT sensor terminal B and PCM terminal 2BA


Short circuit

•  If there is continuity, the circuit is shorted. Repair or replace the harness.
―  ECT sensor terminal A and power supply
―  ECT sensor terminal A and body ground
―  ECT sensor terminal B and power supply