Temperature Gauge: Description and Operation

The temperature gauge is connected to the engine coolant temperature sensor on the G20 circuit. The engine coolant temperature sensor for the gauge is a combination unit. One side of the unit is used for the Powertrain Control Module (PCM), and the other side for the cluster. The sending unit is case grounded to the engine.

The gauge uses two coils, and the current passing through the coils creates a magnetic field. Movement of the needle is determined by the amount of current passing through the coils to ground at the engine coolant temperature sending unit.