Section 06 ELECTRICAL SYSTEM
Subsection 01 (IGNITION SYSTEM)
GENERAL
NOTE: The EMS controls the ignition system.
For more information, refer to ENGINE MANAGE-
MENT.
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1. Ignition coil
NOTE: The MPEM energizes the primary side of
each ignition coil individually while the ECM com-
pletes the circuit by switching it to the ground at
the right moment. The ECM can detect open and
short circuit in the primary winding but it does not
check the secondary winding.
WARNING
Never check for engine ignition spark from
an open coil and/or spark plug in the engine
compartment as spark may cause potential
fuel vapor to ignite.
CAUTION: Do not remove the ignition coil be-
fore disconnecting the connector, or the wires
will be damaged. Do not pry up ignition coil
with a screwdriver to avoid damage.
QUICK TEST WITH B.U.D.S.
Using the vehicle communication kit (VCK) with
the B.U.D.S. software, energize the ignition coil.
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You should hear the spark occurring. In doubt, use
an inductive spark tester or a sealed tester - avail-
able from tool suppliers to prevent spark occurring
in the bilge. If there is no spark, perform the fol-
lowing checks.
NOTE: Keep in mind that even if there is a spark
during this static test, voltage requirement is high-
er to produce a spark in the combustion chamber
when engine is running. Ignition coil could be not
working in real operation. Replacing ignition coil
may be necessary as a test.
VOLTAGE TEST
Disconnect the connector from the ignition coil
and check the voltage supplied by the MPEM.
Install safety lanyard on the DESS post. Read volt-
age.
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