Engine coolant temperature (ECT) gauge
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
The engine control module (ECM), (4/46) processes the value from the coolant temperature sensor (7/16). The processed value is then transmitted to the central electronic module (4/56) on the high speed section of the Control Area Network (CAN). The central electronic module receives the signal and generates a corresponding signal on the low speed section of the Control Area Network (CAN). The driver information module (5/1) reads the signal from the low speed section of the Control Area Network (CAN). The driver receives information about the temperature from the engine coolant temperature gauge in the combined instrument panel. If the value is too high a red lamp lights and a text message is displayed outlining the fault.