PIAGGIO 500 cc Service Manual page 192

Fuel injection
Disconnect the air intake temperature
sensor connector.
Measure the resistance between the
sensor terminals.
Check that the resistance corresponds to the values
stated on the basis of temperature.
RESISTANCE
16.6 KΩ
9.75 KΩ
5.97 KΩ
3.74 KΩ
2.41 KΩ
YES
Connect the sensor connector and repeat
resistance control on terminals 18 and 22.
18-22 = Resistance equal to the value given
directly to the sensor.
On revealing slightly higher resistance
values, check the connectors.
On revealing infinite resistance (>1MΩ)
check continuity of the two wires with
connectors disconnected.
Grey-white-18 = 0 Ω (continuity)
Light blue-green-22 = 0 Ω (continuity)
YES
9 - 80
TEMPERATURE
-10° C
0
+10° C
+20° C
+30° C
Proceed with sensor replacement.
NO
Repair or replace the harness.
NO