217K views · 65 reactions | An engine coolant temperature sensor measures the temperature of your engine coolant, in order to tell the engine fuel unit (ECU) when to adjust the fuel injection and ignition timing. The coolant temperature sensor works within your vehicle's ECU, by sending regulated voltage to the sensor. #fblifestyle | Abdullah auto electrician | Facebook

Under ERP 2.0, the current in-vehicle unit (IU) will be replaced with the on-board unit (OBU). Unlike the IU, which is only activated when passing through an ERP gantry, the processing unit is like a mini-computer which is processing information when the car engine is switched on. Hence, the processing unit generates more heat than the IU. LTA has measured the temperature at different locations within a car and commercial vehicle. Due to greenhouse effect within an enclosed space, temperatures a