Gilera Nexus 500 Workshop Manual page 255

Nexus 500
3 - Check for any short circuits on the instrument
unit power supply line, check that the instrument
unit has not short-circuited
YES go to 5
4 - Check whether the LED comes on when pin No.
2 of the decoder connector is connected to ground
(yellow/grey cable).
YES go to 6 NO go to 7
5 - Restore
YES go to 2
6 - Replace the decoder and reprogram.
7 - Check for continuity on the yellow/grey cable,
measuring between the decoder connector and
the 8 pin connector of the instrument panel
YES go to 8 NO go to 10
8 - Check for positive battery voltage on the red/
black cable of the 8-way connector of the instru-
ment panel.
YES go to 9 NO go to 10
9 - Faulty led, replace the instrument panel.
10 - Repair or replace the wiring.
11 - If the injection light does not come on, continue with the check of the supply circuit to the decoder
and of the central control unit.
Tachometer
Electric characteristic
TERMINAL: 7 - 12
CONDITIONS : Start up engine speed
STANDARD: approx. 0.8 - 4.5 V
Injection
INJEC - 63