Derbi boulevard 125 4t Workshop Manual page 75

Electrical system
with the key switch set to "ON" check whether
there is battery voltage; if there is no voltage,
check the wiring connections to the key switch.
If battery potential is found, repeat the inspection
from the connector to the ECU.
After detaching the choke device, start the engine
and, while at idle, check for tension connecting the
positive terminal of the multimetre to terminal 5
(Orange) and the negative to terminal 7 (White/
Black) (see figure).
If no tension is found, replace the ECU; otherwise
check the wiring between the choke device and the
ECU.
Turn signals system check
- If the turn signal lights are faulty, proceed as fol-
lows:
- Detach the ECU connector and check for battery
tension between terminal 5 (Orange) and earth,
with the key-switch onto «ON».
- Check the same is present between terminals 5
(Orange) and 8 (Black).
If no tension is measured, check the wiring, other-
wise proceed as follows:
- Jumper terminals 1 (Black/Blue) and 5 (Orange),
see figure, and alternately operate the turn signal
switch towards left and right wit the key-switch on-
to «ON» and check the bulbs go off.
If this happens, replace the ECU, as faulty.
If this does not happen, check the wiring between
the ECU and the turn signal switch, hence repeat
the test.
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