PIAGGIO 500 cc Service Manual page 198

Fuel injection
Measure the tension between terminals 1 and
22 of the special tool.
1-22 = 5±0.2 V
YES
Connect the TPS connector.
Repeat tension measurement between
terminals
1 and 22 of the special tool.
1-22 = 5±0.2 V
YES
Measure the tension between terminals 11 and 22. Gradually open the throttle valve and
As an indication, the tension limits can vary from a minimum ~700mV to more
The possible variations in value limits are generated by the mounting
YES
9 - 86
check that tension value increases gradually.
11-22 = V (gradual variation)
NOTE
than 4V maximum.
tolerances of the sensor.
Check the control unit connection.
If necessary proceed with replacement of the control unit.
NO
Replace the throttle body complete with sensors and stepper.
(see Chapter. 7-THERMAL UNIT AND TIMING SYSTEM)
NO
NO