Ignition Circuit; No Spark Plug - PIAGGIO XEVO 125 Euro 3 Service Station Manual

XEVO 125 Euro 3
- If the failure persists, it means that the MASTER
key and the control unit are not linked; in this case,
replace the control unit and then encode the keys.
The immobilizer system is efficient when, after
switching over to "ON", only a 0.7-second flash is
detected (see diagram).
In this case, the engine can be started.
Example with programmed control unit, trans-
ponder, programmed key and aerial working prop-
erly.
Ignition is enabled (regular conditions of use)

Ignition circuit

Once the immobilizer system is enabled, the HV coil and the signals from the Pick-Up will produce a
spark in the spark plug.
The battery provides the basic power supply. The system is adjusted so that the start-up system im-
mediately detects an eventual battery voltage drop, but this is practically irrelevant for the ignition
system.
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
that the cable between terminal No. 8 (Green) and
terminal No. 6 (Black) is not interrupted. 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 detected, replace the Pick-Up, otherwise check the cable har-
Electrical system
ELE SYS - 13