PIAGGIO 500 cc, Service Manual

Page: 193 / 239

Fuel injection
9 - 81
9
Check that the sensor circuit is isolated from
the earth.
18-23 =
Ω
infinity (
>
1M
Ω
)
22-23 =
Ω
infinity (
>
1M
Ω
)
Reset or replace the harness.
Check the coolant temp. lines and throttle position.
NO
YES
Measure the tension at terminals 18 and 22.
18-22 = V as per table.
TENSION TEMPERATURE
XXX V -10° C
XXX V 0
XXX V +10° C
XXX V +20° C
XXX V +30° C
Connect the special tool 020481Y to the control unit.
Set ignition to "ON" with switch on "RUN" and side stand raised.
NO NO
YES
Measured value = 5±0.2V
Repeat continuity
controls of the sensor and
harness.
Measured value = 0 V
Repeat control of
earthing isolation of the
sensor circuit.
NO YES
Reset or replace the
harness.
Check the connection to
the control unit.
Check the control unit feeds If
necessary replace the control unit.
Start the engine and check that the tension reduces progressively according to temperature
increase in the air filter box.
NOTE
In a temperate climate it is quite easy to reach 30°C after a few minutes of parking with the engine idling.
YES