Fuel Injection Control

Fully sequential fuel injection is used on the MS41.1 system. Operation is the same as the [1][2]DME M5.x system, with the Crankshaft Position sensor and air mass sensor inputs used as the primary signals to determine the basic injector opening time.

This value is then modified based on the input values such as:
- Engine Coolant and Intake Air temperature
- Exhaust O2 content
- Throttle position

The Camshaft position sensor input is used to initiate the correct injector firing order. If the camshaft sensor input fails the control module will maintain full-sequential injection until the engine is switched off. On the next restart, the control module will trigger the fuel injectors in parallel.

The fuel injector final stages are monitored for OBD II requirements. Faults with an injector or the control circuits will be stored in memory. When the criteria for OBD II monitoring is satisfied, the check engine lamp will also illuminate.