If different values are measured (<1; >20KΩ), replace the shielded cap.
N.B.
A SHIELDLESS CAP OR SPARK PLUG CAN ADVERSELY AFFECT THE INJECTION SYSTEM.
FOR INFORMATION ON THE SPARK PLUG, SEE THE «SPECIFICATIONS» AND «MAINTE-
NANCE» CHAPTERS.
Spark advance
The ignition advance is determined electronically on the basis of parameters known by the control unit.
For this reason it is not possible to declare the reference values based on the engine rpm.
The ignition timing value is detectable any time using the diagnostic tester.
It is possible to check whether the ignition advance determined by the system does in fact correspond
with the value actually activated on the engine, by means of the stroboscopic light.
Specific tooling
020460Y Scooter diagnosis and tester
020330Y Stroboscopic light for timing control
Proceed as follows:
- Remove the transmission compartment cover as
described in the "automatic transmission" chapter.
- Remove the TDC reference inspection cap be-
tween flywheel and crankcase cover. See the "fly-
wheel cover" chapter
Injection MP3 400 i.e.
INJEC - 40
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