PIAGGIO 500 cc - Fuel Injection - Air Intake Sensor Resistance and Connection Checks

Fuel injection
9 - 80
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.
NO
YES
RESISTANCE TEMPERATURE
16.6 KΩ -10° C
9.75 KΩ 0
5.97 KΩ +10° C
3.74 KΩ +20° C
2.41 KΩ +30° C
Proceed with sensor replacement.
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.
NO
YES
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)
Repair or replace the harness.