Temperature Sensor (Gauge): Testing and Inspection

ENGINE COOLANT TEMP (ECT) METER AND ECT SENSOR




METER INSPECTION
1. Disconnect P/B lead wire going to ECT sensor.
2. Turn ignition switch ON, and check that ECT meter indicates COOL.
3. Turn ignition switch OFF.
4. Ground P/B lead wire through a 3.4 W test bulb (1) as illustrated.
5. Turn ignition switch ON, and check that bulb light up and pointer (2) moves to hot side.
6. If ECT meter shows no operation, repair or replace defective parts.




ECT SENSOR INSPECTION
1. Warm up ECT sensor (1) observing resistance between sensor terminal (2) and sensor unit (1). Resistance should be decreased with increase of its temperature.




2. Check resistance between sensor terminal (2) and sensor unit (1). If check result is not as specified, replace sensor.