ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [G6]

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Note
•  Perform the following inspection only when directed.

ECT Sensor Resistance Inspection

1.  Drain the engine coolant, (See ENGINE COOLANT REPLACEMENT [G6].)

2.  Remove the ECT sensor.

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

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

•  If not as specified, replace the ECT sensor.
•  If the ECT sensor is okay, but PID valve is out of specification, inspect for the following:
Open circuit
―  ECT signal circuit (ECT sensor connector terminal A and PCM connector terminal 2Q through common connector)
―  GND circuit (ECT sensor connector terminal B and PCM connector terminal 2D through common connector)
Short circuit
―  ECT signal circuit (ECT sensor connector terminal A and PCM connector terminal 2Q through common connector to GND)
―  GND circuit (ECT sensor connector terminal B and PCM connector terminal 2D through common connector to GND)

Specification

Water temperature

(°C {°F})

Resistance (kilohm)
20 {68}
2.0—2.9
80 {176}
0.27—0.38

5.  Repair or replace faulty areas.

6.  Install the ETC sensor.

7.  Refill the engine coolant. (See ENGINE COOLANT REPLACEMENT [G6].)