Gilera 633721, Workshop Manual

Page: 276 / 407

The possible variations of the limit values are
caused by the sensor installation tolerances.
YES go to 15 NO go to 14
14 - Replace the throttle body along with sensors
and Stepper.
YES point 12
15 - Check that the voltage measured at pins 11
and 22 matches that indicated by the diagnostic
tester set to " PARAMETERS ".
YES go to 16 NO go to 17
16 - The throttle valve position sensor and relevant circuit are conforming.
17 - Replace the control unit.
Zeroing the throttle
Resetting the throttle valve position signal (TPS reset)
The throttle body 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 to control 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 motor and the
variation of the ignition advance.
The throttle body after the pre-calibration has an opened valve with an 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 mV of the
sensor with the valve at idle can vary from one throttle body to another.
To obtain the optimum fuel mixture, 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. The control unit will recognise such value as angle 5.24°.
To reset, proceed as follows:
Injection
Nexus 500 euro 3
INJEC - 276