APRILIA Atlantic 300 Service Station Manual page 188

Injection
Install the electronic control unit interface wiring.
Start the engine and warm it up until the electric
fan switches on.
Use an analogue multimeter with a direct voltage
scale measuring down to 2V.
Place the multimeter probes between pins 4 (-)
and 11 (+)
With the engine running at idle speed, check that
the voltage oscillates between 0V and 1V
With the throttle valve fully open, the voltage is ~
1V.
During the closing phase, the voltage is ~ 0V.
If the voltage remains constant, the sensor may be
damaged. Remove the sensor and check that
there are no oil or carbon deposits in it.
INJEC - 188
ATLANTIC 300 i.e.