Integra (RS, LS) L4-1834cc 1.8L DOHC PFI (1995)
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Temperature Gauge: Description and Operation
When the Ignition Switch is 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 engine coolant temperature (ECT) gauge 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) gauge sending unit's resistance varies from about 137 ohms at low engine temperature to between 3O-40
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 to
LOCK (0), the gauge remains at the last reading until you turn the ignition switch to ON (II) or START (III) again.
