APRILIA SR MAX 125 ie Service Station Manual page 70

Electrical system
- HV primary coil check
Disconnect the connector of the HV coil and 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
~ 1 ohm
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 diagno-
sis, check the peak voltage with the multimeter
adaptor.
Electric characteristic
High voltage coil secondary resistance value
~ 8,000 ± 300 ohm
Pick-Up.
- Disconnect the control unit connector and con-
nect the positive terminal to connector No. 13 and
the negative terminal to connector No. 15 (see fig-
ure).
- The multimeter end of a scale should be 200V.
Use the start-up system to run the engine and
measure the voltage produced by the Pick-Up.
- Replace the Pick-Up if non-conforming values
are measured.
NOTE
THE MULTIMETER MUST BE SELECTED TO DETECT
CONTINUOUS VOLTAGE.
Specific tooling
020409Y Multimeter adaptor - Peak voltage de-
tection
Electric characteristic
ELE SYS - 70
SR MAX 125 ie