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Home >> Plymouth >> 1981 >> Reliant Base, 2D Sedan, 2.2L Eng VIN B, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Hall Effect Electronic Spark Control System >> Testing >> Poor Performance Tests >> Coolant Sensor

Coolant Sensor

Turn ignition switch off and disconnect wire connector from sensor. Connect ohmmeter leads to sensor terminals. With engine cold and ambient temperature below 90°F, resistance should read 500-1000 ohms. With a hot engine, resistance should be greater than 1300 ohms.

NOTE: The coolant sensor resistance will continually change with changes in engine temperature. It is not a switch.
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