Normal functioning
If the engine has the correct temperature, the I.A.W. unit calculates the timings, the injection time and the advance, by comparing the stored map values, in accordance with the RPM and throttle angle. The quantity of fuel set in this way is fed in one single sequential delivery to the two cylinders. The moment for starting the delivery, for each cylinder, is established by a map in accordance with the RPM.
Start stage
When the ignition switch is turned ON, the I.A. W. unit feeds the fuel pump for a few moments and receives the throttle opening angle and engine temperature signals. When the engine is started, the unit receives the engine RPM and timing signals which allow it to proceed with injection and ignition. To facilitate start up, the rider uses the choke control and there is also an enrichment in the basic dose in accordance with the coolant temperature. During starting, the ignition advance is fixed (CP) until the engine starts. When the engine starts, the unit starts the advance control.
Acceleration/deceleration
During acceleration, the system increases the quantity of fuel delivered to optimise drive ability. This condition is recognised when the variation of the throttle angle is high and the enrichment factor is proportional to the engine load variation and the coolant temperature. Similarly, when there is a negative variation in the throttle opening angle, it is interpreted as the desire to decelerate: the system reduces the quantity of fuel delivered.