Technical data

Aprilia Consumer Service Spa

Technical Service and Training

Release 4 july 99

This material is didactic and

may be changed following the technical

development of the product

The control unit software switches between the DJ map and the alpha/n map on the basis of the

engine running conditions. The injection volume also depends on the other factors provided by the

compensation devices, illustrated later on.

The switch from D/J to alpha/n occurs gradually (See down figure) :

As shown in the above figure, the D/J map is almost 100% active in low load running conditions

(e.g. engine in neutral).

The alpha/N curve becomes predominant in power delivery conditions.

Remember that the control unit is connected electrically to the instrument panel, and that there is

also the self-diagnosis function. When in the diagnosis option, the panel displays the fault codes

that act as a guide in the servicing.

/ n

Injection Volume

Throttle angle