ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION

Resistance Inspection

Note

• Perform the following inspection according to the DATA MONITOR function (indicated by monitor item from here onwards).

1. Disconnect the negative battery cable.

2. Disconnect the ECT sensor connector.

3. Remove the ECT sensor.

4. Place the ECT sensor in the water and while increasing water temperature, measure the resistance between terminals A and B.

• If not within the specification, replace the ECT sensor.

• If the monitor item condition/specification (reference) is within the specification, even though the resistance is within the specification, carry out the "Circuit Open/Short Inspection".

Resistance

Water temperature (°C {°F})	Resistance (kilohm)
20 {68}	2.212.69
80 {176}	0.290.35

Circuit Open/Short Inspection

1. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)

Open circuit

• If there is no continuity, the circuit is open. Repair or replace the wiring harness.

- ECT sensor terminal A and PCM terminal 2J

- ECT sensor terminal B and PCM terminal 2AX

Short circuit

• If there is continuity, the circuit is shorted. Repair or replace the wiring harness.

- ECT sensor terminal A and power supply

- ECT sensor terminal A and body GND

- ECT sensor terminal B and power supply