VESPA 946 E4 EMEA 2021 Manual page 193

Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)
Injection
4. For troubleshooting, use a multimeter with an internal resistance of more than 10KW/V. Improper
instruments may damage the control unit. The instruments to be preferred have a definition over 0.1V
and 0.5W and an accuracy over 2%.
1. Before repairing any part of the injection system, check if any faults have been stored. Do not dis-
connect the battery before checking for faults.
2. The supply system is pressurised at 250 kPa (2.5 BAR). Before disconnecting the fast-release fitting
of the fuel supply pipe, check that there are no naked flames. Do not smoke. Act with caution to avoid
spraying fuel to your eyes.
3. When repairing electric components, the battery must always be disconnected unless it is strictly
necessary for the battery to be connected.
4. When functional checks are performed, make sure that the battery voltage exceeds 12V.
5. Before attempting to start the vehicle, ensure that there are at least two litres of fuel in the tank.
Failure to respect this norm will damage the fuel pump.
6. If a long period is envisaged with the vehicle not in use, fill the tank to at least the halfway mark. This
will ensure the pump will be covered by fuel.
7. When washing the vehicle, do not spray excessive water on electric components and wiring har-
nesses.
8. In the event of ignition problems, begin troubleshooting from the battery and the injection system
connections.
9. Before disconnecting the ECU connector, perform the following steps in the order shown:
- Set the switch to «OFF»
- Disconnect the battery
Failure to respect this norm may damage the control unit.
10. Do not invert the poles when fitting the battery.
11. To avoid causing any damage, disconnect and reconnect the system connectors only if required.
Before reconnecting, check that the connectors are dry.
12. When carrying out electric inspections, do not force the tester probes into the connectors. Do not
take measurements not specifically foreseen by the manual.
13. At the end of every check performed with the diagnostic tester, remember to protect the system
connector with its cap. Failure to observe this precaution may damage the control unit.
14. Before reconnecting the quick couplers of the power supply system, check that the terminals are
perfectly clean.
INJEC - 193