On-Board Diagnostics - Siemens Ms43 Engine Management System: Introduction: Notes

The Freelander Petrol Engine Management System (EMS) for North American Specification vehicles consists of the Siemens MS43 ECM controlling the 2.5L KV6 engine. The Engine Control Module (ECM) uses the inputs from sensors to control engine performance and restrict emissions in line with Onboard Diagnostics II (OBDII). These sensors include a Mass Airflow (MAF) sensor, Throttle Position (TP) sensor, Engine Coolant Temperature (ECT) sensor and Oxygen (O2) sensors. The ECM also receives vehicle data, such as road speed from other control modules. The Central Processor Unit (CPU) within the ECM processes all of these inputs, applies correction factors, such as short and long term fuel trim, and issues commands to the engine actuators, injection valves and coils.