IFI Start Quantity Control Task/Design/Function

Design
Model 202 up to 11/94






Model 202 as of 12/94, model 210

Task
Controlling the start quantity in line with the operating state of the engine, irrespective of the position of the accelerator pedal.

Function
The crankshaft position and engine speed are detected by the IFI/DFI crankshaft position sensor (L5/6) and signaled to the IFI control module (N3/7). In addition, a signal for processing the required start quantity is passed via the coolant temperature sensor (B11/4) to the IFI control module (N3/7), which is then passed on to the fuel metering control (Y23/1), with the feedback of the fuel rack position sensor (Y23/1I1). The start quantity control is deactivated after the engine has started and engine speed is > 600 rpm.

The start quantity is controlled up to engine speed of 600 rpm by the start quantity control irrespective of the position of the accelerator pedal.
The engine speed can be varied from the accelerator pedal only after engine speed exceeds > 600 rpm (dependent on coolant temperature).
The higher the coolant temperature, the smaller the start quantity which is released by the IFI control module (N3/7).

Emergency start model 207 up to 11/94 only
If a fault message from the IFI/DFI crankshaft position sensor (L5/6) is received in the IFI control module (N3/7) after the last start, an rpm signal is required from the starter ring gear rpm sensor (L3) for the next start.