Ignition Circuit - Derbi GP1 125-250 c.c. Workshop Manual

I I
GNITION CIRCUIT GNITION CIRCUIT
Ignition system
Once the ¡mmobilizer system has been enabled, it is possible
to have the spark at the spark plug by the H.V. coil and the
signáis coming from the Pick-Up.
The basic power supply comes from the battery, the system is
calibrated in such a way that any drops of voltage of the bat-
tery are perceived by the start up system but are unimportant
for the start up system.
The Pick-Up is connected to the control unit by a single wire,
thus for the earth circuit the Pick-Up is connected to the con-
trol unit by the chassis and the engine earth cable.
To prevent troubles to the start up system during start up,
it is very important to have a good efficiency ofthe engine-
chassis earth connection.
S S
PARK PLUG PARK PLUG
Finding the lack of current to the signaling candle with led
ignition possible to proceed like of continuation:
-Control Pick-Up.
Disconnect the connector from the central unit and check
that there is a circuit between terminal A (white/green) and
terminal B (yellow/green). The pick-up check is carried out
on the pick-up and its power feed line:
Electric characteristic
Resistance value pick-up
105 ÷ 124 ohm
If the circuit is interrupted, repeat the check between the
flywheel connector and the and the engine earth (see en-
gine manual). If the measured values are not as specified,
replace the pick-up, otherwise repair the wiring.
If, on the other hand, the values are as specified, try repla-
cing the control unit (without programming it) and ensure
that the problem has been solved by checking that a spark is
produced at the plug.
Then proceed to program the control unit.
- Checking the HV coil primary circuit
Disconnect the connector from the central unit and check
that there is a circuit between terminal A (green/black) and
terminal B (yellow/green).
If the resistance is not as specified, repeat the check directly on
the positive and negative terminals of the HV coil primary cir-
cuit. If the resistance is as specified, proceed to repair the wiring
or restore the connections, otherwise replace the HV coil.
Electric characteristic
Resistance value H.V. coil primary check
0,4 ÷ 0,5 ohm
226