PIAGGIO MP3 500 i.e. SPORT Service Station Manual page 292

MP3 500 i.e. SPORT Business_LT_ ABS-ASR_EU_USA (2015)
Injection
PIN PIN
22 23
With the connector on the control unit side disconnected and the coolant temperature sensor connector
connected, check that the resistance values between pins 22 and 23 correspond to the engine tem-
perature, as shown in the table.
With the connector on the control unit disconnected and the coolant temperature connector discon-
nected, check the insulation between the light blue-green cable and ground lead.
With the connector on the control unit disconnec-
ted and the coolant temperature connector dis-
connected, check the continuity between pin 22 of
the control unit connector and the light blue-green
cable of the sensor connector.
Specific tooling
020331Y Digital multimeter
Zeroing the throttle
Throttle valve position signal reset (TPS reset)
The RIU 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 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 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 TPS resetting procedure.
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 indicated in the following.
INJEC - 292
PIN RELATIONSHIP
Component
Engine temperature sensor
Reference value
1965 to 2500 Ohm at 20°C; 561.1 to 590.5
Ohm at 60°C; 227.3 ÷ 235.1 mm at 90°C