Chrysler Pacifica. Manual — part 498
IGNITION CONTROL
TABLE OF CONTENTS
page
page
IGNITION CONTROL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . . . . . . . . . . . . . . . . . . . . . . . 2
CAMSHAFT POSITION SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
IGNITION COIL
. . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
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IGNITION COIL CAPACITOR
. . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . 8
KNOCK SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
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SPARK PLUG
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
SPARK PLUG CABLE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
. . . . . . . . . . . . . . . . . . . . . . . . . 12
IGNITION SWITCH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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KEY/LOCK CYLINDER
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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IGNITION CONTROL
DESCRIPTION - IGNITION SYSTEM
NOTE: All engines use a fixed ignition timing sys-
tem. Basic ignition timing is not adjustable. All
spark advance is determined by the Powertrain
Control Module (PCM).
The ignition system used on these engines is
referred to as the Direct Ignition System (DIS). The
system’s four main components are the coils, crank-
shaft position sensor, spark plugs, and camshaft posi-
tion sensor. If equipped with the coil on plug ignition
system it utilizes an ignition coil for every cylinder
and is mounted directly over the each spark plug.
OPERATION - IGNITION SYSTEM
The crankshaft position sensor and camshaft posi-
tion sensor are hall effect devices. The camshaft posi-
tion sensor and crankshaft position sensor generate
pulses that are inputs to the PCM. The PCM deter-
mines engine position from these sensors. The PCM
calculates injector sequence and ignition timing from
crankshaft & camshaft position. For a description of
both sensors, refer to Camshaft Position Sensor and
Crankshaft Position Sensor.
CS
IGNITION CONTROL
8I - 1
SPECIFICATIONS
TORQUE
DESCRIPTION
N·m
Ft. Lbs.
In. Lbs.
SKREEM Module Screws
1.8
-
16
Ignition Switch Mounting
Nuts
3.4
-
30
Spark Plug 3.5l
28
20
-
Spark Plug 3.8L
17.5
13
-
Ignition Coils 3.5L
6.7
-
60
Ignition Coil Nuts 3.8L
11.8
-
105
Camshaft Position Sensor
Bolt 3.5L
12
-
106
Camshaft Position Sensor
Bolt 3.8L
14.1
-
125
Knock Sensor 3.5L
20
15.2
-
Knock Sensor 3.8L
10
7
-
SPARK PLUG
Engine
Spark Plug
Gap
Thread Size
3.5L
ZFR5LP-13G
0.048 TO 0.053
14mm (3/4 in.) reach
3.8L
re14PLP5
0.048 TO 0.053
14mm (3/4 in.) reach
SPARK PLUG CABLE RESISTANCE
3.8L
CABLE
Maximum Resistance
#1
22.5K ohms
#2
22.8K ohms
#3
19.3K ohms
#4
19.3K ohms
#5
13.6K ohms
#6
16.4K ohms
8I - 2
IGNITION CONTROL
CS
IGNITION CONTROL (Continued)
CAMSHAFT POSITION
SENSOR
OPERATION
The camshaft position sensor contains a hall effect
device that provides cylinder identification to the
Powertrain Control Module (PCM) (1) (Fig. 1) and
(Fig. 2). The sensor generates pulses as groups of
notches on the camshaft sprocket pass underneath it.
The PCM keeps track of crankshaft rotation and
identifies each cylinder by the pulses generated by
the notches on the camshaft sprocket.
When metal aligns with the sensor, voltage goes
low (less than 0.3 volts). When a notch aligns with
the sensor, voltage spikes high (5.0 volts). As a group
of notches pass under the sensor, the voltage
switches from low (metal) to high (notch) then back
to low. The number of notches determine the amount
of pulses. If available, an oscilloscope can display the
square wave patterns of each timing event.
REMOVAL
3.5L
(1) Disconnect the negative battery cable.
(2) Remove air cleaner box.
(3) Unlock the camshaft sensor electrical connector
(Fig. 3).
(4) Disconnect the electrical connectors to the cam-
shaft sensor.
(5) Remove the mounting bolts.
Fig. 1 Camshaft Position Sensor—3.5L
Fig. 2 CAMSHAFT POSITION SENSOR — 3.8L
Fig. 3 CAM SENSOR LOCATION
Fig. 4 CAM SENSOR REMOVED
CS
IGNITION CONTROL
8I - 3
(6) Remove camshaft sensor (Fig. 4).
3.8L
(1) Disconnect the negative battery cable.
(2) Unlock the camshaft sensor electrical connec-
tor.
(3) Disconnect the electrical connectors to the cam-
shaft sensor (Fig. 5).
(4) Loosen the mounting bolts (Fig. 6).
(5) Remove camshaft sensor (Fig. 7).
(6) Camshaft Position Sensor removed (Fig. 8).
Fig. 5 MOUNTING BOLT LOOSE
Fig. 6 CAMSHAFT POSITION SENSOR LOCATION
Fig. 7 SENSOR REMOVED
Fig. 8 CAMSHAFT POSITION SENSOR
8I - 4
IGNITION CONTROL
CS
CAMSHAFT POSITION SENSOR (Continued)
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