Rio L4-1.5L (2001)
The coolant temperature gauge pointer is moved by the magnetic field of two coils at right angles to each other. Battery voltage is applied to the "C" coil
from the "METER (10 A)" fuse. The circuit then divides into two. One path continues through the H coil and then to ground.
The other path goes through the variable resistance of engine coolant temperature sensor and then to ground. When the coolant temperature is high, the
resistance of the engine coolant temperature sensor is low and less current flows through the "H" coil pushing the pointer toward "H" indicator. When the
coolant temperature is low, the resistance of the engine coolant temperature sensor is high and more current flows through the "H" coil pushing the
pointer toward "C" indicator.
