Engine coolant temperature gauge (Instruments)

Engine coolant temperature gauge

The engine coolant temperature gauge is an analogue gauge with three sections: cold temperature; normal operating temperature; high temperature. Under normal engine operating temperatures the engine coolant temperature gauge will display in the centre of the gauge. When the engine is cold e.g. from first start-up, the coolant temperature gauge will display in the cold band. When the engine is over heating the temperature gauge will display in the high temperature band. If the engine coolant temperature gauge receives no input or the input is out of range the temperature gauge will read cold and the high coolant temperature warning lamp will be illuminated.

The input signal is a PWM signal from the engine coolant temperature sensor via the ECM. The power input for the high coolant temperature warning lamp is supplied by the instrument pack via fuse 27. The ECM controls the earth path to illuminate the high coolant temperature warning lamp.