PIAGGIO Beverly 500 i.e., Workshop Manual

Page: 249 / 382

even though not in an optimum way, always safe-
guarding the catalytic converter integrity.
The throttle valve position signal is especially im-
portant at the small valve openings. These areas
are also where the sensor works more frequently,
and therefore they require more frequent checks
after a high number of kilometres run.
To check the sensor and related circuit, proceed
as follows:
1 - Connect the diagnostic tester.
Set the switch to " ON " with switch to " RUN " and
side stand raised.
Select the tester menu on the « ERRORS » func-
tion.
Check whether the control unit has detected any
failures relating to the throttle valve position signal.
YES go to 6 NO go to 2
Specific tooling
020680Y Diagnosis Tool
2 - Select the diagnostic tester menu on the " PA-
RAMETERS " function.
Check whether the control unit recognises the ex-
treme positions:
Throttle valve to minimum
Throttle valve to maximum
YES go to 4 NO go to 3
3 - Check the adjustment of the throttle valve control flexible transmissions. Fix or replace, if required.
YES go to 2
4 - Gradually open the throttle valve, check that the mV value increases progressively and proportionally
with the opening variation.
YES go to 5 NO go to 6
5 - The throttle valve position signal is conforming.
6 - Connect the special tool to the injection system.
Do not connect the tool to the control unit.
Disconnect the throttle valve position sensor connector.
Check the continuity between the connector's terminals and the relevant pins on the control unit.
Specific tooling
Beverly 500 i.e.
Injection
INJEC - 249