VESPA 946 E4 EMEA 2021 Manual page 207

Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)
Switch to «ON» and check that, with the injector
disconnected and the control unit connected, there
is a voltage present between the Black-Green ca-
ble of the injector connector and earth.
With injector disconnected and the injector load relay disconnected, check the continuity of the Black-
Green cable between the injector connector and relay base.
Inspecting the injector hydraulics
- Remove the engine from the vehicle as described in the corresponding chapter.
- Remove the injector by unscrewing the screw fixing the injector to the head.
Install the specific tool to check the fuel pressure
and position the manifold on a graduated container
of at least 100 cm³.
Connect the injector to the wire supplied with the
injection tester.
Connect the clamps of the cable to an auxiliary
battery.
Activate the fuel pump with the active diagnosis.
Check that, within fifteen seconds, approximately
40 cm³ of fuel is dispensed with an adjustment
pressure of approximately 2.5 Bar.
Specific tooling
020480Y Fuel pressure measurement kit
Tachometer
Disconnect the fuel pipe connector. Start up the engine and wait for it to stop. With the wiring connected
to the control unit and system try to start up the engine and check that the voltage between pin 20 and
29 is around 2.8 V
- Check the continuity between pin 29 of the injection control unit and the red cable of the engine speed
sensor.
- Check the continuity between pin 20 of the injection control unit and the brown cable of the engine
speed sensor.
Injection
INJEC - 207