PIAGGIO NRG POWER PUREJET, Руководство по ремонту, Страница: 173 / 248

and get rid of the fuel aged by boiling within the
injector support. Subsequent management of the
pump is combined with the presence of the rpm
timing signal. This guarantees the safety of the ve-
hicle in the event of an accident. The ECU auto-
diagnosis also checks the pump electrical circuit.
A fault is recognised in the event of an interrupted
circuit or short. The fault is recognised with a pri-
ority level of 3, this means registered by the auto-
diagnosis but not signalled by turning on the
injection lamp. Naturally, this fault causes the en-
gine to fail and is easily recognisable on an acous-
tic level due to the failure of the pump to rotate.
- The footrest needs to be removed to access the
fuel pump.
- In order to gain access to the fuel pump it is nec-
essary to remove the foot rest board
- A connection is present at the pump entrance
with with the derivation of two tubes, respectively:
A: fuel arrival tube
B: fuel drainage tube
In the case of replacement, do not invert the order
of the two tubes during reassembly.
1- Switch to the «ON» position. Listen for activation of the pump for 4-5 seconds
YES point 3 NO point 2
2 - Proceed with the auto-diagnostic and control circuit checks.
3 - Check whether the pump activation starts up again when trying to start the engine.
YES point 4 NO point 5
4- The pump control circuit is efficient.
5- Check the auto-diagnostic and the phase - rpm signal.
6- Connect the scooter diagnostic tester Select the «active diagnostic» function
GO TO point 7
Specific tooling
020460Y Scooter diagnosis and tester
7- Check that the tank is adequately topped up and proceed with the activation of the «fuel pump»
diagnostic. Listen for 10 consecutive activations of around 4 seconds of the fuel pump. Check the
outcome on the diagnostic tester.
YES point 8 NO point 9 NO point 10
NRG Power Purejet
pure jet injection
INJ PJ - 57