S80 T6 L6-2.9L Turbo VIN 91 B6294T (2002)
The engine coolant temperature (ECT) sensor checks the temperature of the engine coolant. The temperature of the engine coolant is required so that the
engine control module (ECM) can regulate:
-
the injection period
-
the idle speed
-
the engine cooling fan (FC)
-
the ignition advance
-
engagement and disengagement of the A/C compressor
-
diagnostic functions.
The sensor is a negative temperature coefficient (NTC) type which is supplied with power from the control module (signal) and is grounded in the
control module.
The resistance in the sensor changes according to the temperature of the engine coolant. This provides the control module with a signal of between
0.1-4.9 V. The lower the temperature the higher the voltage (high resistance). A high temperature results in low voltage (low resistance).
The engine coolant temperature (ECT) sensor is located beside the thermostat.
The engine control module (ECM) can diagnose the engine coolant temperature sensor. The sensor value can be read off using VIDA.
Engine cooling fan (FC) / engine cooling fan (FC) control module
