VESPA 946 E4 EMEA 2021 Manual page 95

Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)
2. Previously unused control unit - transpond-
er absent or cannot be used: the LED is on
permanently. In this condition no operations are
possible including the start up of the vehicle.
3. Programmed control unit - the service key in
(normal condition of use): a single 0.7-second
flash is displayed, after which the LED remains off
steadily. The engine can be started.
4. Programmed control unit - Master key in: a
0.7-sec flash is displayed followed by the LED re-
maining off for 2 sec and then by short 0.46-sec
flashes, the same number of times as there are
keys stored in the memory including the Master
key. When the diagnosis has been completed, the
LED remains permanently OFF. The engine can
be started.
5. Programmed control unit - fault detected: a light code is displayed according to the fault detected,
after which the LED remains on steadily. The engine cannot be started. The codes that can be trans-
mitted are:
•
1-flash code
•
2-flash code
•
3-flash code
Diagnostic code - 1 flash
DIAGNOSIS CODE 1 FLASH This error is identi-
fied as a serial failure. (damaged or shorted to
ground). With this code proceed with the following
checks:
- Antenna power supply: On pin 1 and 2 there must
be battery voltage with the key turned to «ON».
(Pin 1 positive, pin 2 negative). Test the continuity
and the insulations of the serial line. Check the
continuity between pin 3 of the antenna and the
corresponding pin on the control unit pin 14.
Carefully check that the connections are free of
oxidation. A more detailed control can be per-
formed by detecting the voltage relative to the
Electrical system
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