ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

Note

• Perform the following test only when directed.

Resistance Inspection

1. Drain the engine coolant.

2. Remove the ECT sensor.

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

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

• If not as specified, replace the ECT sensor.

• If the ECT sensor is okay, but PID value is out of specification, perform the "Circuit Open/Short Inspection".

Specification

Water temperature (°C {°F})	Resistance (kilohms)
20 {68}	2.2-2.8
80 {176}	0.29-0.4

Circuit Open/Short Inspection

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

2. Inspect the following wiring harness 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 41

- ECT sensor terminal B and PCM terminal 20

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