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20-4
IGNITION SYSTEM
(Refer to Section 201 for photographs.)
Component
Photo No.
Fuse Block-Underhood
Left side of engine compartment
3
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Ignition Coil 1 (4.2L)
Top of engine
16
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Ignition Coil 1 (5.3L)
Top left side of engine
23
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Ignition Coil 2 (4.2L)
Top of engine
16
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Ignition Coil 2 (5.3L)
Top right side of engine
20
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Ignition Coil 3 (4.2L)
Top of engine
16
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Ignition Coil 3 (5.3L)
Top left side of engine
23
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Ignition Coil 4 (4.2L)
Top of engine
16
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Ignition Coil 4 (5.3L)
Top right side of engine
20
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Ignition Coil 5 (4.2L)
Top of engine
16
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Ignition Coil 5 (5.3L)
Top left side of engine
23
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Ignition Coil 6 (4.2L)
Top of engine
16
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Ignition Coil 6 (5.3L)
Top right side of engine
20
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Ignition Coil 7 (5.3L)
Top left side of engine
23
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Ignition Coil 8 (5.3L)
Top right side of engine
20
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Powertrain Control Module
(PCM) (4.2L)
Left front of engine
5
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Powertrain Control Module
(PCM) (5.3L)
Left front of engine compartment
25
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Connector
C108 (5.3L) (8-LT GRY)
Top right side of engine
20
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C109 (5.3L) (8-LT GRY)
Top left side of engine
23
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Ground
G109 (4.2L)
Lower left side of engine
37
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G109 (5.3L)
Lower left side of engine
38
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Component Location Index
STARTING SYSTEM
Fuse Block-Underhood
Ignition Switch
Park/Neutral Position (PNP) Switch
Powertrain Control Module (PCM) (4.2L)
Powertrain Control Module (PCM) (5.3L)
Starter (4.2L)
Starter (5.3L)
Starter Relay 47
Component Index
21-0
STARTING SYSTEM
PNK
0.35
YEL
0.35
PPL
0.35
RED
19
RED
3
PPL
5
BATTERY
+
t
M
See Power
Distribution,
page 10-4.
B
STARTER
Connector
STARTER
MOTOR
STARTER
SOLENOID
Pull-in
Coil
Hold-in
Coil
G110
IGN A
Fuse 34
40A
C1
A8
STARTER
RELAY 47
1
2
3
D
P
R
N
PARK/
NEUTRAL
POSITION
(PNP)
SWITCH
Connector
C2
E
C2
G
POWERTRAIN CONTROL
MODULE (PCM)
(4.2L
(5.3L)
Connector 4.2L
Connector5.3L
Crank
voltage
See Power
Distribution,
page 10-4.
STAR
T
RUN
ACC
LOCK
IGNITION
SWITCH
Connector
Starter
enable
relay
control
HOT IN RUN AND START
IGN E
Fuse 22
10A
FUSE
BLOCK-
UNDER-
HOOD
Connector
A5
See Power
Distribution,
page 10-13.
C2
F11
FUSE
BLOCK-
UNDER-
HOOD
Connector
C1
A10
F8
YEL
3
YEL/BLK
0.35
RED
19
F6
CRANK
Fuse 17
10A
C2
F7
C2
C1
B5
C201
Connector
BLK
8
BLK
19
BLK
19
BLK
8
G106
G101
*48
**39
C1*
*31
C2**
**59
* 4.2L
** 5.3L
C1
C201
Connector
Crank
request
signal
C1
*29
C2
F10
DK GRN
0.35
D
YEL
3
F
RED
3
S
See Power
Distribution,
page 10.
RED
19
4.2L
**18
C2
Circuit Schematic
21-1
STARTING SYSTEM
120Ć3
The PG-260L is a non-repairable starter motor. It has
pole pieces that are arranged around the armature
within the starter housing. When the solenoid windings
are energized, the pull-in winding circuit is completed to
ground through the starter motor. The hold-in winding
circuit is completed to ground through the solenoid. The
windings work together magnetically to pull in and hold
in the plunger. The plunger moves the shift lever. This
action causes the starter drive assembly to rotate on
the armature shaft spline as it engages with the
flywheel ring gear on the engine. At the same time, the
plunger closes the solenoid switch contacts in the
starter solenoid. Full battery voltage is then applied
directly to the starter motor and it cranks the engine.
As soon as the solenoid switch contacts close, current
stops flowing thorough the pull-in winding as battery
voltage is now applied to both ends of the windings. The
hold-in winding remains energized; its magnetic field is
strong enough to hold the plunger, shift lever, starter
drive assembly, and solenoid switch contacts in place
to continue cranking the engine. When the engine
starts, the pinion gear overrun sprag protects the
armature from excessive speed until the switch is
opened.
When the ignition switch is released from the CRANK
position, voltage is removed from the starter solenoid S
terminal. Current flows from the motor contacts through
both windings to ground at the end of the hold-in
winding. However, the direction of the current flow
through the pull-in winding is now in the opposite
direction of the current flow when the winding was first
energized.
The magnetic fields of the pull-in and hold-in windings
now oppose one another. This action of the windings,
along with the help of the return spring, cause the
starter drive assembly to disengage and the solenoid
switch contacts to open simultaneously. As soon as the
contacts open, the starter motor is turned off.
Circuit Operation
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