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03-078-2
Ignition, Electronic-4.6L (2V)
03-078-2
DESCRIPTION AND OPERATION (Continued)
Ignition Coil
The ignition coils ( 1 2029) contain two separate
ignition coils. Each coil is controlled by the ignition
control module (ICMX 12K072) through two coil leads.
Each ignition coil activates two spark plugs ( 1 2405)
simultaneously:
•
one spark plug on the compression stroke; this
spark plug use the majority of the ignition coil stored
energy.
•
one spark plug on the exhaust stroke; this spark
plug uses very little of the ignition coil stored energy.
•
These two spark plugs are connected in series.
- The firing voltage of one spark plug will be
negative with respect to ground.
- The voltage of the other spark plug will be
positive with respect to ground.
Refer to the Powertrain Control
I
Emissions Diagnosis
Manual1 for additional information on spark plug
polarity.
The ignition coils are mounted on ignition coil brackets
retained to the engine front cover (60 19). There are
two cylinder numbers on each ignition coil terminal to
allow the ignition coil to be interchangeable.
1
Can be purchased as a separate item.
NOTE: The numbers on the ignition coil tower
terminals shown in the illustration are engine cylinder
numbers. These numbers are shown for information
only and are not shown on ignition coil towers. Actual
identification labels are shown in View A. The ignition
wire connected to a particular ignition coil tower
should be connected at the other end to the spark plug
for the same numbered cylinder.
(·)
7/6
(+) 4/1
VIEW A
DIAGNOSIS AND TESTING
Ignition
HIGH VOLTAGE
TOWERS
COIL2
PINS-LH IGNITION
COIL 12029
1 -COIL4
2-BATTERY
POSITIVE
VOLTAGE (B+)
IN START/RUN
3-COIL3
213 (+)
8/5 (·)
Refer to the Powertrain Control
I
Emissions Diagnosis
Manual1•
REMOVAL AND INSTALLATION
Crankshaft Position (CKP) Sensor
Removal
1 . Disconnect battery ground cable ( 14301 ). Refer
to Section 14·0 1 .
2. Remove serpentine drive belt (8620). Refer to
Section 03-Q5.
1997
Thunderbird, Cougar July
1 996
Содержание Thunderbird
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