Component Tests and General Diagnostics
Engine Coolant Temp. Meter1. 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/BI" 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.