PIAGGIO MSS X9 EVOLUTION 250 - HV Coil Secondary Check

HV coil secondary check
Disconnect the spark plug cap from the HV cable and measure the resistance between the HV cable
terminal and the HV coil negative terminal (see figure). If non-conforming values are measured, replace
the HV coil. To carry out a more complete diagnosis, check the peak voltage with the multimeter adaptor.
Electric characteristic
High voltage coil secondary resistance value
High voltage coil secondary resistance value: ~ 3000 ± 300 Ohm
- Pick-Up.
- Disconnect the control unit connector and con-
nect the positive terminal to connector No. 2 and
the negative terminal to connector No. 8 (see fig-
ure).
Use the start-up system to run the engine and
measure the voltage produced by the Pick-Up.
Replace Pick-Up if non-conforming values are
measured.
Electric characteristic
Pick-Up voltage value
Pick-Up voltage value: > 2 Volt
- HV coil
With the control unit and HV coil connected, meas-
ure the voltage of the coil primary during the start-
up test with the voltage peak adaptor and con-
necting the positive terminal to the ground one and
the negative to the coil positive connector.
If non-conforming values are measured, replace
the control unit.
N.B.
THE PLASTIC CAP OF THE POSITIVE TERMINAL ON THE
HV COIL PRIMARY IS BLACK AND THE NEGATIVE TER-
MINAL ONE IS GREEN.
Electric characteristic
MSS X9 Evolution 250 Electrical system
ELE SYS - 65