Gilera Runner RST Purejet, Руководство по обслуживанию, Страница: 137 / 235

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T.P.S. signal reset
The throttle body is supplied with gas valve and is precalibrated. Precalibration entails regulating the
minimum opening of the gas valve to obtain a certain flow of air under preset reference conditions.
Pre-calibration results in an optimum air capacity for the engine management during start up or during
idle running, and at any possible temperature during the use of the vehicle. This is allowed by the
electronic management of the engine and by its capacity to work with very lean air - fuel mixtures. In
fact, pre-calibration results in an air capacity which, with idle and hot engine, is much higher than the
actual requirements.
To achieve higher engine performance, increased rpm are not due to the gas valve opening increase,
but are enabled by the ECU.
When the ECU perceives a slight increase in the gas valve opening, it enables the engine to fast rotation
and excludes the idle and the CUT OFF management.
This result can be obtained by recovering the pre-calibration and keying tolerances of the TPS sensor
on the throttle body.
This occurs by resetting the signals TPS1 and TPS2, i.e., by reporting the voltage values TPS1 and
TPS2 corresponding to the pre-calibration position to the ECU.
These voltage values will be recognised as suitable by the ECU only if falling within the design default
ranges.
The throttle body pre-calibration register is sealed with paint and must not be tampered with.
The signals TPS1 and TPS2 may be reset as follows:
- Automatic reset
- Manual reset
Specific tooling
020460Y Scooter diagnosis and tester
automatic T.P.S. reset
AUTOMATIC RESET
Automatic reset already occurs at the end of the assembly line when the battery power is connected
and switched to «ON». In order to prevent resetting the signals TPS1 and TPS2 not corresponding to
the actual pre-calibration position of the throttle body, the ECU should only be powered after checking
that the valve command sector is correctly abutted against the register. A slight tensioning of the flexible
transmission commanding the throttle body may impair the reset precision and the injection control.
A greater tensioning causes signals TPS1 and TPS2 whose voltage is not as expected by the ECU,
which cancels the reset procedure.
To check that TPS signals are properly reset, use the following procedure:
Runner RST Purejet
pure jet injection
INJ PJ - 25