Civic Hatchback L4-1.5L SOHC (16 valve) (1995)
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Temperature Gauge: Description and Operation
When the ignition switch is in ON (II) or START (III), battery voltage is supplied through fuse 15 to the gauges in the gauge assembly.
The Engine Coolant Temperature (ECT) gauge has two intersecting coils wound around a permanent magnet rotor. Voltage applied to the coils, through
fuse 15, generates a magnetic field. The magnetic field, controlled by the coolant temperature sending unit, causes the rotor to rotate and the gauge
needle to move. As the resistance in the sending unit varies, current through the gauge coils changes. The gauge needle moves toward the coil with the
strongest magnetic field. The fuel gauge works the same way.
The engine coolant temperature (ECT) sending unit's resistance varies from about 137 ohms at low engine temperature to between 30-46 ohms at high
temperature (radiator fan running).
The fuel gauge sending unit's resistance varies from about 2-5 ohms at full, to about 110 ohms at empty. When you turn the ignition switch OFF, the
gauge remains at the last reading until you turn the ignition switch to ON (II) or START (III) again.
