CL L4-2156cc 2.2L SOHC F22B1 MFI (1997)
Temperature Gauge: Description and Operation
When the ignition switch is in ON (II) or START (III), battery voltage is supplied through fuse 1 to the gauges in the gauge assembly. The gauge circuit
is grounded at G404.
The engine coolant temperature gauge has two intersecting coils wound around a permanent magnet rotor. Voltage applied to the coils, through fuse 1,
generates a magnetic field. The magnetic field, controlled by the engine 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, pulling the gauge needle toward the coil with the stronger
magnetic field. The fuel gauge works the same way.
The resistance of the sending unit for the engine coolant temperature gauge varies from about 137 ohms at low engine temperature to between 30-46
ohms at high temperature (radiator fan running).
