APRILIA scarabeo 125 i.e. Service Station Manual page 150

Injection
Separate the lower part of the pump support as
shown in the photograph.
Remove the filter from the pump support
Zeroing the throttle
Throttle valve position signal reset (TPS reset)
The MIU control unit is supplied with throttle valve position sensor and is pre-calibrated.
Pre-calibration entails regulating the minimum opening of the throttle valve to obtain a specific air flow
under pre-set reference conditions.
Pre-calibration ensures optimal air flow for the control of the idle speed.
This regulation must not be tampered with in any way whatsoever.
The injection system will complete the management of the idling through the Stepper and the variation
of the ignition advance.
After the pre-calibration the throttle body has an open valve with a variable angle depending on the
tolerances of the machining of the pipe and the valve itself.
The valve position sensor can also have various fitting positions. For these reasons the mVs of the
sensor with the valve at idle can vary from one throttle body to another.
To obtain the optimum carburetion, especially at small openings of the throttle valve, it is essential to
match the throttle body with the control unit following the procedure known as TPS resetting.
With this operation we inform the control unit, as a starting point, of the mV value corresponding to the
pre-calibrated position.
To reset, proceed as follows.
Connect the Axone following the specific instructions.
Shift to «ON».
INJEC - 150
SCARABEO 125 i.e. - 200 i.e.