Section 05 ELECTRICAL SYSTEM
Subsection 03 (IGNITION SYSTEM)
IGNITION SYSTEM
SERVICE TOOLS
Description
Part Number
Page
ECM ADAPTER TOOL...................................................................
529 036 166 ......................................... 292
FLUKE 115 MULTIMETER ............................................................
529 035 868 ......................................... 291
SERVICE PRODUCTS
Description
Part Number
Page
DOW CORNING 111 .....................................................................
413 707 000 ......................................... 293
GENERAL
SYSTEM DESCRIPTION
The ignition system is a digital inductive type sys-
tem.
Ignition system parameters such as ignition tim-
ing, spark duration, and firing order, are controlled
by the ECM in order to meet engine operational
requirements.
Three separate ignition coils receive power from
three separate fuses.
When a ground signal is provided by the ECM to
an ignition coil primary winding, a high voltage is
induced in the coil secondary winding that is used
to produce a spark at the spark plug electrode.
smr2009-032-002_a
1. Ignition coils
Ignition Timing
Ignition timing is not adjustable.
The ECM is programmed with data (ignition map-
pings), which it uses along with data it receives
from a variety of sensors to establish optimum
ignition timing under all engine operating condi-
tions.
The firing of each spark plug is independent of the
others.
Knock Sensor
A knock sensor is mounted on the cylinder block
behind the intake manifold. It detects specific vi-
brations that would typically be generated by en-
gine detonation.
If detonation occurs, the knock sensor detects
it and the ECM goes into a specific operating
mode whereby it temporarily retards the ignition
advance until detonation stops.
The ECM is able to identify in which cylinder the
knocking occurs and modifies the ignition advance
on that cylinder only.
Refer to the
ELECTRONIC FUEL INJECTION
sec-
tion for testing and replacement procedures.
TROUBLESHOOTING
DIAGNOSTIC GUIDELINES
The following is provided to help in diagnosing the
probable source of troubles. It is a guideline and
it should not be assumed to list all possible prob-
lems.
smr2009-032
289
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