Zeroing The Throttle - VESPA GTS 250 I.E. Workshop Manual

Injection
With the control unit side connector disconnected
and coolant temperature sensor connector dis-
connected, check the continuity between pin 9 of
the interface wiring and the light blue-green cable
of the connector and between pin 19 of the inter-
face wiring and the grey-green cable of the con-
nector.
Specific tooling
020481Y Control unit interface wiring
020331Y Digital multimeter

Zeroing the throttle

Resetting the throttle valve position signal (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 certain flow of
air under pre-set reference conditions.
Pre-calibration ensures optimal air flow for the control of the idling.
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.
The throttle body after the pre-calibration has an opened valve with angle that can vary depending on
the tolerances of the machining of the pipe and the valve itself.
The valve position sensor can also assume various fitting positions. For these reasons the mVs of the
sensor with the valve at minimum can vary from one throttle body to another.
To obtain the optimum fuel preparation, 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 the starting point, of the mV value corresponding to
the pre-calibrated position.
To reset, proceed as follows.
INJEC - 44
Vespa GTS 250 I.E.