The major components of the system consist of the electronic control module and the various system sensors. The purpose of the sensors is to provide information to the ECM regarding various engine performance characteristics. The information sent to the ECM is used to instantaneously regulate engine and vehicle performance.
The Camshaft Position Sensor (CMP) is a Hall effect sensor stacked in front of a magnet with a signal conditioning integrated circuit. It responds to a rotating actuator positioned on the camshaft gear. The camshaft actuator has twenty-four (24) stamped windows. This produces a rectangular wave pulse for each tooth as the actuator rotates past the sensor. The pulses are used to indicate engine speed and camshaft position for control of fuel quantity, injection timing and overspeed shutdown. It is located on the engine front cover, right-hand side above the water pump pulley; see Figure 31294 .
Camshaft Position Sensor
The Engine Coolant Temperature Sensor (CTS) is a thermistor type sensor which senses changes in engine coolant temperature. It is located on the front right-hand side of the cylinder head, below the thermostat; see Figure 31295 .
Engine Coolant Temperature Sensor
The Engine Oil Temperature Sensor (OTS) is a thermistor type sensor which senses engine oil temperature. It is located on the back left-hand side of the front cover above the high pressure pump housing. This sensor is used to provide engine temperature signal to the ECM which uses the information for fuel rate and timing adjustments; see Figure 31295 .
Engine Oil Temperature Sensor
The Engine Oil Pressure Sensor (EOP) is a ceramic diaphragm sensor used to indicate low engine oil pressure via a signal from the ECM. It is located on the left-hand side of the crankcase, below the fuel filter; see Figure 31296 .
Engine Oil Pressure Sensor
The Injection Control Pressure Sensor (ICP) is a ceramic diaphragm sensor used to measure injection control/rail pressure. It is located on the left-hand side of the engine. The sensor is mounted in the middle of the supply manifold, for engines equipped with the engine mounted ECM. This sensor provides injection control pressure feedback to the ECM for closed loop control of injector oil pressure; see Figure 31291 .
Injection Control Pressure Sensor
The Injection Pressure Regulator Valve (IPR) achieves injection control pressure regulation. It is located on the left-hand side of the high pressure pump. The IPR is a pulse width modulated valve which controls injector oil pressure via a signal from the ECM; see Figure 31292 .
Injection Pressure Regulator Valve
The Manifold Absolute Pressure (MAP) sensor is a ceramic diaphragm sensor that indicates manifold boost pressure or vacuum via a signal from the ECM. It is located on top of the valve cover/intake manifold; see Figure 31293 .
Manifold Absolute Pressure Sensor