The Pick-Up is connected to the control unit by a single cable; then, for the ground circuit, the control
unit is connected to the Pick-Up by the chassis and the engine ground lead.
To avoid disturbances in the ignition system during start-up, it is very important that the engine-chassis
ground connection bonding is efficient.
No spark plug
Once the lack of power to the spark plug has been
detected and the LED indicates it can be ignited,
follow this procedure:
- Pick-Up check.
Disconnect the control unit connector and check
the resistance value between terminal No. 2
(Green) and terminal No. 8 (Black). Check the
Pick-Up and its power line:
Electric characteristic
Pick-up resistance value
Pick-up resistance value: 105 ÷ 124 Ohm
If a break in the circuit is found, check again the flywheel and the engine ground connectors (see engine
manual). If non-conforming values are measured, replace the Pick-Up; otherwise, repair the cable har-
ness.
In case conforming values are measured, try replacing the control unit (without programming) and make
sure the failure has been solved by checking sparks are produced in the spark plug; only then program
the control unit.
- HV primary coil check
Disconnect the control unit connector and check
that the cable between terminals No. 3 and No. 8
is not interrupted (see figure).
If non-conforming values are measured, check
again the HV primary coil directly on the positive
and negative terminals. If non-conforming values
are measured, repair the cable harness or else re-
place the HV coil.
Electric characteristic
High voltage coil primary resistance value
High voltage coil primary resistance value: 0.4 ÷
0.5 Ohm
B 125-250 Electrical system
ELE SYS - 89
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