Section 07 ELECTRICAL SYSTEM
Subsection 01 (IGNITION SYSTEM)
Vehicle Control Module (VCM)
The VCM energizes the primary side of each igni-
tion coil individually (positive voltage).
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1. VCM
Ignition Coil
Ignition coil induces voltage to a high level in sec-
ondary windings to produce a spark at spark plug.
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The digital inductive ignition system is used to
allow the spark plugs to spark independently on
each piston stroke.
CAUTION: Do not interchange spark plug ca-
bles. Reversed spark plug cables will not allow
the engine to run and will cause backfires.
ADJUSTMENT
IGNITION TIMING
Before checking ignition timing with a stroboscop-
ic timing light (dynamic test), it is mandatory to
scribe a timing mark on the PTO flywheel (static
test) corresponding to the specific engine.
Also, the timing mark scribed on the PTO flywheel
can be used to troubleshoot a broken magneto
woodruff key.
CAUTION: The relation between the PTO
flywheel mark and crankshaft position may
change as the PTO flywheel might move on
crankshaft when engine is ran. This will result
in false ignition timing readings. If timing mark
does not align with pointer tool when checking
the ignition timing with an appropriate timing
light (dynamic test), verify timing mark again
(static test) to ensure flywheel has not moved.
NOTE: Do not use the factory mark found on the
PTO flywheel to check ignition timing or trou-
bleshoot any problems.
Normally ignition timing adjustment should not be
required. It has been set at factory and it should
remain correctly adjusted since every part is fixed
and not adjustable. The only time the ignition tim-
ing might have to be changed would be when re-
placing the crankshaft, the magneto rotor the CPS
and the VCM or the ECM. If the ignition timing is
found incorrect, you should first check for proper
crankshaft alignment. This might be the indication
of a twisted crankshaft.
The fixed timing mode must be activated before
checking ignition timing. See FIXED TIMING
FUNCTION paragraph.
Scribing a Timing Mark (Static Test)
– Disconnect MAG side spark plug wire and
connect wire to grounding device then remove
spark plug.
CAUTION: Never crank engine with spark plugs
removed unless spark plug cables are connect-
ed to the grounding device.
– Remove PTO flywheel guard.
– Remove middle screw securing the engine to
the rear engine mount. Reinstall screw with
timing mark pointer tool (P/N 295 000 135).
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