T.p.s.=Throttle Position Sensor - PIAGGIO 500 cc Service Manual

T.P.S.=THROTTLE POSITION SENSOR

Terminals Conditions
1-22 Ignition set to "ON"
11-22 Opening the throttle gradually
progressive
CIRCUIT DIAGRAM
1
CONTROL UNIT
2
THROTTLE POSITION SENSOR
The TPS is set on the throttle body and is of the fixed type.
This sensor receives a 5V feed from the control unit and sends it a gradually increasing tension as the throttle opening
increases. The control unit converts this tension into an angular position of the throttle.
The number of engine revolutions and the TPS are the two basic signals for management of the engine.
Damage to this circuit causes the fuel injection indicator to light up and activation of protection. Under these
conditions the engine can function even if not on optimum, always safeguarding the integrity of catalyctic converter.
The TPS is particularly important in correspondence with the small openings in the throttle. These are also the areas
where the sensor works most often and therefore to be controlled more often.
To control the sensor and related circuit proceed as follows.
Connect the diagnosis tester 020460Y.
See page 9-17
Ignition set to "ON" with switch on "RUN"
and side stand raised.
Select the "ERRORS" function from the tester menu
Check if the control unit has revealed anomalies
Concerning the TPS.
Standard
5V
Volt=
progressive increase
A1
A2
B1
4
B2
3
2
3
4
NO
22
4
18
11
1
1
AIR TEMPERATURE SENSOR
COOLANT TEMPERATURE SENSOR
YES
Fuel injection
9
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