Section 07 ELECTRICAL SYSTEM
Subsection 01 (IGNITION SYSTEM)
NOTE: If the generating coil tests good, discon-
nect the primary wires of the ignition coil. Crank
engine and check voltage at primary wires. It
should be at least 20 Vac. If there is insufficient
or no voltage, either the MPEM or wiring harness
is defective.
MULTI-PURPOSE ELECTRONIC
MODULE (MPEM)
It is not possible to accurately check the MPEM
condition without specialized tools.
However, the ignition output voltage can be veri-
fied. There should be at least 12 V on the WHITE
wire that power the primary winding of the igni-
tion coil when starting engine.
Ifthereisnovoltage,replaceMPEM.
NOTE: Before replacing the MPEM, make sure
all connectors are properly secured and there is
no water in connectors. Check the grounds and
the signal and power contacts in the AMP plug
connectors. See WIRING DIAGRAMS.
Rev Limiter
To check engine rev limiter, connect an induction
tachometer (P/N 529 014 500), start engine and
check its maximum speed.
MODEL RPM LIMITER SETTING
717
7100 ± 50
IGNITION COIL
Static Test
NOTE: An ignition coil with good resistance mea-
surement can still be faulty. Voltage leak can oc-
cur at high voltage level which is not detectable
with an ohmmeter.
Primary Winding
3
1
F17H04A
2
3
1. Primary side
2. Secondary side
3. Ground plate
Disconnect the wire connectors on primary side
of the ignition coil.
Using a multimeter, check the resistance between
the primary side connectors of the coil.
Theresistanceshouldbe0.34to0.62 at 20°C.
If not within specification, replace the ignition coil.
Secondary Winding
The spark plug caps must be removed from high
tension cables, because they are resistor caps.
The cap resistance is 4.48 k
.
A00E0QA
1
2
1. Resistor cap
2. High-tension cable
Using a multimeter, check the resistance between
the two high tension leads with the spark plug
caps removed.
Theresistanceshouldbe12±3k
at 20°C.
NOTE: A short circuit will read 0 ohm (or close to)
on ohmmeter.
Dynamic Test
Use an ignition coil tester, available from
after-market tool/equipment suppliers.
smr2005-057 151
To Next Page
Loading...
Need help?
General
