D Group 28 Design and Function The EMS is a microprocessor based controller programmed to perform fuel injection quantity and timing control, diagnostic fault logging, and to broadcast data to other modules. The fuel quantity and injection timing to each cylinder is precisely controlled to obtain optimal fuel economy and reduced exhaust emissions in all driving situations.
Engine Coolant Level (ECL) Sensor Engine Coolant Temperature (ECT) Sensor Engine Oil Pressure (EOP) Sensor Engine Oil Level (EOL) Sensor Engine Oil Temperature (EOT) Sensor Exhaust Temperature Sensor (DPF Sensors) Fuel Pressure Sensor Intake Air Temperature And Humidity (IATH) Sensor Intake Manifold (Boost) Temperature Sensor Throttle Position (TP) Sensor Turbo Speed Sensor Variable Geometry Turbocharger (VGT) Position Sensor The EMS controls the operation of the Electronic Unit Injectors (EUIs), engine brake solenoid, EGR valve, turbocharger nozzle position, and cooling fan clutch based on input information it receives over the serial data lines and from the following sensors:
Ambient Air Temperature Sensor Ambient Pressure sensor Boost Air Pressure (BAP) Sensor Camshaft Position (Engine Position) Sensor Cooling Fan Speed (CFS) Sensor Crankshaft Position (Engine Speed) Sensor Differential Pressure DPF Sensor EGR Differential Pressure Sensor EGR Temperature Sensor The Vehicle Electronic Control Unit (VECU) and Engine Management System (EMS) Module are dependent on each other to perform their specific control functions. In addition to switch and sensor data the broadcast of data between modules also includes various calculations and conclusions each module has developed, based on the input information it has received. 2