D Group 28 Design and Function Engine Coolant Temperature (ECT) Sensor The Engine Coolant Temperature Sensor is located at the front of the engine. The sensor will indicate a high coolant temperature caused by problems like radiator blockage, thermostat failure, heavy load, or high ambient temperatures. This sensor is also used for cold start enhancement and for fan clutch engagement. Engine Oil Pressure (EOP) Sensor The Engine Oil Pressure Sensor contains a pressure sensitive diaphragm and a electrical amplifier. Mechanical pressure applied to the diaphragm causes the diaphragm to deflect and the amplifier to produce an electrical signal proportional to the deflection.
The Engine Oil Pressure Sensor is located on the oil filter assembly. The sensor monitors engine oil pressure to warn of lubrication system failure. Engine Oil Level (EOL) Sensor The Engine Oil Level Sensor is located in the oil pan. Engine Oil Temperature (EOT) Sensor The Engine Oil Temperature Sensor is a thermistor whose resistance varies inversely to temperature. The sensor has a negative temperature coefficient, which means the sensor resistance will decrease as the engine oil temperature increases. The Engine Oil Temperature Sensor is located in the oil pan.
Exhaust Temperature Sensor (DPF Sensors) The exhaust gas temperature sensor detects exhaust gas temperature for DPF protection as well as DPF regeneration control. The sensor modifies a voltage signal from the control unit. The modified signal returns to the control unit as the exhaust temperature at that specific location of the exhaust. The sensor uses a thermistor that is sensitive to the change in temperature. The Exhaust Temperature Sensors are located in the DPF assembly. Fuel Pressure Sensor The fuel pressure sensor contains a diaphragm that senses fuel pressure. A pressure change causes the diaphragm to flex, inducing a stress or strain in the diaphragm.
The resistor values in the sensor change in proportion to the stress applied to the diaphragm and produces an electrical output. The Fuel Pressure Sensor is located on top of the fuel filter housing. 5