Coolant temperature sensor (G 62)

The coolant temperature sensor is a NTC thermistor and is installed in the thermostat housing. Each temperature of the coolant corresponds to a certain resistance value, transmitted to the control unit in the form of a voltage signal.

The coolant temperature information is used as a correction factor for many of the system functions that the VU handles (makes adjustments to the ignition timing and injection duration, to the idle speed of a cold engine). Some system functions are controlled based on coolant temperature (knock control, lambda control, ventilation via activated charcoal reservoir). In the absence of a signal, the control unit takes a signal from the air temperature sensor the next time the engine is started and this temperature rises further. The highest substituted temperature is 87°C.