Starting System: Description and Operation

Start quantity control
Fuel has to be injected additionally during the start operation, in line with the coolant temperature, in order to facilitate starting of a cold engine. The increased quantity of fuel injected is achieved by extending the injection time.

Battery voltage and voltage supply
The injected fuel quantity is determined by the opening times of the fuel injectors. This opening time is dependent on the battery voltage. If, for example the battery voltage is insufficient, the ME-SFI control module extends the injection time in order to achieve the specified injected quantity. No further engine start is possible at a voltage of less than approx. 7 V.

Post-start enrichment
Enrichment with additional fuel is necessary for a short time after starting the engine when cold. This enrichment compensates for the fuel which precipitates on the cylinder walls, and the engine runs smoothly.

Synchronizing fuel injection and firing order
The order is synchronized during the first revolutions of the engine in order to achieve the correct assignment of the fuel injection and firing order to the particular cylinder. The ME-SFI control module requires the signals from the camshaft Hall sensor and crankshaft position sensor for this purpose.

Ignition at engine start
When the engine is started and up to approx. 500 rpm, the ignition timing point is controlled only on the basis of the signals supplied by the camshaft Hall sensor. Only once the engine speed has reached approx. 600 rpm is a transition made from the fixed ignition timing point to the ignition timing point calculated in line with the momentary operating state.

Starter control
The solenoid switch of the starter (circuit 50) is actuated through the starter relay by the engine control module.


NOTE: The drive authorization system inhibits the engine management system. The starter rotates, but the engine does not start.


Electronic ignition switch (EIS) control module position/task/design/function
- Model 202, 208, 210

Transmission control module position/task/design/function
- Information on selector lever position P/N and gear engaged
- Model 202, 208, 210

Starter control function
- with manual transmission
- with automatic transmission
- with manual transmission (USA)