IGNITION SYSTEM
NS
8D - 1
IGNITION SYSTEM
TABLE OF CONTENTS
page
page
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . 1
2.4L ENGINE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.0L ENGINE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3/3.8L ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . 19
IGNITION SWITCH AND LOCK CYLINDER . . . . . . 26
GENERAL INFORMATION
TABLE OF CONTENTS
page
DESCRIPTION AND OPERATION
IGNITION SYSTEM . . . . . . . . . .
SPARK PLUGS RESISTER. . . . .
SPARK PLUGS PLATINUM. . . . .
SPARK PLUG CABLE. . . . . . . . .
IGNITION COIL . . . . . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.1
.1
.1
.2
.3
page
AUTOMATIC SHUTDOWN (ASD) RELAY
CRANKSHAFT POSITION SENSOR . . . .
CAMSHAFT POSITION SENSOR . . . . . .
KNOCK SENSOR. . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION
SPARK PLUG SERVICE . . . . . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.3
.4
.4
.5
........6
IGNITION SYSTEM
from crankshaft position. For a description of both
sensors, refer to Camshaft Position Sensor and
Crankshaft Position Sensor in this section.
DESCRIPTION
SPARK PLUGS RESISTER
NOTE: The 2.4, 3.0, and 3.3/3.8L engines use a
fixed ignition timing system. Basic ignition timing is
not adjustable. All spark advance is determined by
the Powertrain Control Module (PCM).
DESCRIPTION
DESCRIPTION AND OPERATION
The distributorless ignition system used on 2.4 and
3.3/3.8L engines is referred to as the Direct Ignition
System (DIS). The system’s three main components
are the coil pack, crankshaft position sensor, and
camshaft position sensor.
The 3.0L engine uses a distributor, crankshaft sensor and ignition coil. The system’s main components
are the distributor, distributor pickup, camshaft signal, crankshaft signal and ignition coil.
OPERATION
The crankshaft position sensor and camshaft position sensor are hall effect devices. The camshaft position sensor and crankshaft position sensor generate
pulses that are inputs to the PCM. The PCM determines crankshaft position from these sensors. The
PCM calculates injector sequence and ignition timing
All engines use resistor spark plugs. They have
resistance values ranging from 6,000 to 20,000 ohms
when checked with at least a 1000 volt spark plug
tester.
Do not use an ohm meter to check the resistance of the spark plugs. This will give an inaccurate reading.
Refer to the Specifications section for gap and type
of spark plug.
SPARK PLUGS PLATINUM
DESCRIPTION
The engine utilize platinum spark plugs. Refer to
the maintenance schedule.
All engines use resistor spark plugs. They have
resistance values ranging from 6,000 to 20,000 ohms
when checked with at least a 1000 volt spark plug
tester.
8D - 2
IGNITION SYSTEM
NS
DESCRIPTION AND OPERATION (Continued)
Do not use an ohm meter to check the resistance of the spark plugs. This will give an inaccurate reading.
The spark plugs are double platinum and have a
recommended service life of 100,000 miles for normal
driving conditions per schedule A in this manual. The
spark plugs have a recommended service life of
75,000 miles for severe driving conditions per schedule B in this manual. A thin platinum pad is welded
to both electrode ends as show in (Fig. 1). Extreme
care must be used to prevent spark plug cross
threading, mis-gaping and ceramic insulator damage
during plug removal and installation.
Fig. 2 Setting Spark Plug Electrode Gap
1 – TAPER GAUGE
Clean Spark Plug cables with a cloth moistened
with a non-flammable solvent. Wipe the cables dry.
Check for brittle or cracked insulation.
Fig. 1 Platinum Pads
1 – APPLY ANTI-SEIZE COMPOUND HERE ONLY
2 – PLATINUM SPARK SURFACE
CAUTION: Cleaning of the platinum plug may damage the platinum tip.
SPARK PLUG CABLE
DESCRIPTION
Spark Plug cables are sometimes referred to as
secondary ignition wires. The wires transfer electrical current from the ignition coil pack, distributor
(3.0L), to individual spark plugs at each cylinder. The
resistive spark plug cables are of nonmetallic construction. The cables provide suppression of radio frequency emissions from the ignition system.
Check the spark plug cable connections for good
contact at the coil, distributor cap towers (3.0L), and
spark plugs. Terminals should be fully seated. The
insulators should be in good condition and should fit
tightly on the coil, distributor (3.0L) and spark plugs.
Spark plug cables with insulators that are cracked or
torn must be replaced.
SPARK PLUG CABLES—3.3/3.8L
The spark plug cables and spark plug boots are
made from high temperature silicone materials. The
spark plug boots utilize metal heat shields for thermal protection from the exhaust manifold. The heat
shields slide over the spark plug boots. The notches
on the heat shields ensure the spark plug boot and
shield twist together during spark plug boot removal.
They also identify proper heat shield installation on
the boot for service. Refer to 3.3/3.8L Spark Plug
Cable removal and installation. All spark plug
cable leads are properly identified with cylinder numbers. The inside of the spark plug boot is coated with
a special high temperature silicone grease for greater
sealing and to minimize boot bonding to the spark
plug insulator. The convoluted tubing on the rear
plug cables are made of a high temperature plastic
material. Under normal driving conditions, the spark
plug cables have a recommended service life of a
100,000 miles. The spark plugs have a recommended
service life of 75,000 miles for severe driving conditions per schedule B in this manual.
The spark plug heat shield can be reused if an
ignition cable is replaced due to failure. Never reuse
heat shield’s that have heat shield anti-twist, side or
spark plug attachment tabs bent or missing. Ensure
that the heat shield is properly attached to the spark
plug to avoid RFI problems. The bottom of the spark
NS
IGNITION SYSTEM
8D - 3
DESCRIPTION AND OPERATION (Continued)
plug heat shield must make contact with the spark
plug hex.
The front ignition cables must not make contact
with the oil dip stick tube and #5 cable must not
touch the coil mounting bolt to avoid abrasion/dielectric failures.
IGNITION COIL
WARNING: THE DIRECT IGNITION SYSTEM GENERATES APPROXIMATELY 40,000 VOLTS. PERSONAL INJURY COULD RESULT FROM CONTACT
WITH THIS SYSTEM.
DESCRIPTION
The ignition coil assembly consists of 3 independent coils molded together (Fig. 3). The coil assembly
is mounted on the intake manifold. Spark plug cables
route to each cylinder from the coil.
OPERATION
Fig. 3 Ignition Coil Pack
1 – IGNITION COILS FASTENERS
2 – IGNITION COILS ELECTRICAL CONNECTOR
The coil fires two spark plugs every power stroke.
One plug is the cylinder under compression, the
other cylinder fires on the exhaust stroke. The Powertrain Control Module (PCM) determines which of
the coils to charge and fire at the correct time.
Coil 1 fires cylinders 1 and 4, coil 2 fires cylinders
2 and 5, coil 3 fires cylinders 3 and 6.
The Auto Shutdown (ASD) relay provides battery
voltage to the ignition coil. The PCM provides a
ground contact (circuit) for energizing the coil. When
the PCM breaks the contact, the energy in the coil
primary transfers to the secondary causing the
spark. The PCM will de-energize the ASD relay if it
does not receive the crankshaft position sensor and
camshaft position sensor inputs. Refer to Auto Shutdown (ASD) Relay—PCM Output, in this section for
relay operation.
AUTOMATIC SHUTDOWN (ASD) RELAY
DESCRIPTION
The ASD relay is located in the Power Distribution
Center (PDC). The PDC is located on the driver’s
side inner fender well (Fig. 4). A label on the underside of the PDC cover identifies the relays and fuses
in the PDC.
Fig. 4 Power Distribution Center
1 – POWER DISTRIBUTION CENTER
2 – POWERTRAIN CONTROL MODULE
3 – DRIVER’S SIDE FENDER
OPERATION
The Powertrain Control Module (PCM) operates
the Auto Shutdown (ASD) relay by switching the
ground path on and off.
The ASD relay supplies battery voltage to the fuel
injectors, electronic ignition coil and the heating elements in the oxygen sensors.
The PCM controls the relay by switching the
ground path for the coil side of the relay on and off.
The PCM turns the ground path off when the ignition switch is in the Off position unless the 02
Heater Monitor test is being run. When the ignition
switch is in the On or Crank position, the PCM monitors the crankshaft position sensor and camshaft
8D - 4
IGNITION SYSTEM
NS
DESCRIPTION AND OPERATION (Continued)
position sensor signals to determine engine speed
and ignition timing (coil dwell). If the PCM does not
receive the crankshaft position sensor and camshaft
position sensor signals when the ignition switch is in
the Run position, it will de-energize the ASD relay.
CRANKSHAFT POSITION SENSOR
DESCRIPTION
The crankshaft sensor is located on the passengers
side of the transmission housing, above the differential housing (Fig. 5). The bottom of the sensor is positioned next to the drive plate.
Fig. 6 Crankshaft Position Sensor
1 – CRANKSHAFT POSITION SENSOR
2 – PAPER SPACER
Fig. 5 Crankshaft Position Sensor Location
1 – CRANKSHAFT POSITION SENSOR
2 – TRANSAXLE HOUSING
OPERATION
The crankshaft position sensor detects slots cut
into the transmission driveplate extension (Fig. 6).
There are 3 sets of slots. Each set contains 4 slots,
for a total of 12 slots (Fig. 7). Basic timing is set by
the position of the last slot in each group. Once the
Powertrain Control Module (PCM) senses the last
slot, it determines crankshaft position (which piston
will next be at TDC) from the camshaft position sensor input. The 4 pulses generated by the crankshaft
position sensor represent the 69°, 49°, 29°, and 9°
BTDC marks. It may take the PCM one engine revolution to determine crankshaft position.
The PCM uses crankshaft position reference to
determine injector sequence, ignition timing and the
presence of misfire. Once the PCM determines crankshaft position, it begins energizing the injectors in
sequence.
Fig. 7 Timing Slots
1 – TORQUE CONVERTER DRIVE PLATE
2 – SLOTS
CAMSHAFT POSITION SENSOR
DESCRIPTION
The camshaft position sensor is mounted in the
front of the timing case cover (Fig. 8).
OPERATION
The camshaft position sensor provides cylinder
identification to the Powertrain Control Module
(PCM) (Fig. 9). The sensor generates pulses as
groups of notches on the camshaft sprocket pass
underneath it (Fig. 10). The PCM keeps track of
crankshaft rotation and identifies each cylinder by
the pulses generated by the notches on the camshaft
IGNITION SYSTEM
NS
8D - 5
DESCRIPTION AND OPERATION (Continued)
When metal aligns with the sensor, voltage goes
low (less than 0.3 volts). When a notch aligns with
the sensor, voltage switches 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.
Top Dead Center (TDC) does not occur when
notches on the camshaft sprocket pass below the cylinder. TDC occurs after the camshaft pulse (or
pulses) and after the 4 crankshaft pulses associated
with the particular cylinder. The arrows and cylinder
call outs on Figure 4 represent which cylinder the
flat spot and notches identify, they do not indicate
TDC position.
Fig. 8 Camshaft Position Sensor Location
1 – CAMSHAFT POSITION SENSOR
2 – THERMOSTAT HOUSING
3 – SENSOR MOUNTING BOLT
sprocket. Four crankshaft pulses follow each group of
camshaft pulses.
Fig. 10 Camshaft Sprocket
Fig. 9 Camshaft Position Sensor
1 – ELECTRICAL CONNECTOR
2 – O-RING
3 – PAPER SPACER
When the PCM receives 2 cam pulses followed by
the long flat spot on the camshaft sprocket, it knows
that the crankshaft timing marks for cylinder 1 are
next (on driveplate). When the PCM receives one
camshaft pulse after the long flat spot on the
sprocket, cylinder number 2 crankshaft timing marks
are next. After 3 camshaft pulses, the PCM knows
cylinder 4 crankshaft timing marks follow. One camshaft pulse after the 3 pulses indicates cylinder 5.
The 2 camshaft pulses after cylinder 5 signals cylinder 6 (Fig. 10). The PCM can synchronize on cylinders 1 or 4.
1
2
3
4
5
6
7
–
–
–
–
–
–
–
CAMSHAFT SPROCKET
CYL #6
CYL #5
CYL #4
CYL #3
CYL #2
CYL #1
KNOCK SENSOR
DESCRIPTION
The knock sensor threads into the cylinder block.
The knock sensor is designed to detect engine vibration that is caused by detonation.
8D - 6
IGNITION SYSTEM
NS
DESCRIPTION AND OPERATION (Continued)
OPERATION
When the knock sensor detects a knock in one of
the cylinders, it sends an input signal to the PCM. In
response, the PCM retards ignition timing for all cylinders by a scheduled amount.
Knock sensors contain a piezoelectric material
which constantly vibrates and sends an input voltage
(signal) to the PCM while the engine operates. As the
intensity of the crystal’s vibration increases, the
knock sensor output voltage also increases.
The voltage signal produced by the knock sensor
increases with the amplitude of vibration. The PCM
receives as an input the knock sensor voltage signal.
If the signal rises above a predetermined level, the
PCM will store that value in memory and retard
ignition timing to reduce engine knock. If the knock
sensor voltage exceeds a preset value, the PCM
retards ignition timing for all cylinders. It is not a
selective cylinder retard.
The PCM ignores knock sensor input during engine
idle conditions. Once the engine speed exceeds a
specified value, knock retard is allowed.
Knock retard uses its own short term and long
term memory program.
Long term memory stores previous detonation
information in its battery-backed RAM. The maximum authority that long term memory has over timing retard can be calibrated.
Short term memory is allowed to retard timing up
to a preset amount under all operating conditions (as
long as rpm is above the minimum rpm) except WOT.
The PCM, using short term memory, can respond
quickly to retard timing when engine knock is
detected. Short term memory is lost any time the
ignition key is turned off.
NOTE: Over or under tightening affects knock sensor performance, possibly causing improper spark
control.
REMOVAL AND INSTALLATION
SPARK PLUG SERVICE
When replacing the spark plugs and spark plug
cables, route the cables correctly and secure them in
the appropriate retainers. Failure to route the cables
properly can cause the radio to reproduce ignition
noise, cross ignition of the spark plugs or short circuit the cables to ground.
Never Wire Brush Spark Plugs. The spark plug
insulator tip is harder than the bristles of wire
brushes. Bristles of wire brushes can leave a conductive, metallic film on the insulator which could lead
to conductive deposits. Conductive deposits can cause
spark plug failure and engine misfire. Use a jewelers
file to remove deposits from the electrode gap or use
a spark plug cleaning machine to clean spark plugs.
REMOVAL
Always remove cables by grasping at the boot,
rotating the boot 1/2 turn, and pulling straight back
in a steady motion.
(1) Prior to removing the spark plug, spray compressed air around the spark plug hole and the area
around the spark plug.
(2) Remove the spark plug using a quality socket
with a foam insert.
(3) Inspect the spark plug condition.
INSTALLATION
(1) To avoid cross threading, start the spark plug
into the cylinder head by hand.
(2) Tighten spark plugs to 28 N·m (20 ft. lbs.)
torque.
(3) Install spark plug cables over spark plugs. A
click will be heard and felt when the cable properly
attaches to the spark plug.
IGNITION SYSTEM
NS
8D - 7
2.4L ENGINE
TABLE OF CONTENTS
page
DESCRIPTION AND OPERATION
CRANKSHAFT POSITION SENSOR . . .
CAMSHAFT POSITION SENSOR . . . . .
REMOVAL AND INSTALLATION
SPARK PLUG CABLE SERVICE—2.4L .
IGNITION COIL—2.4L . . . . . . . . . . . . .
CRANKSHAFT POSITION SENSOR . . .
CAMSHAFT POSITION SENSOR . . . . .
.........7
.........8
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.8
.9
.9
.9
DESCRIPTION AND OPERATION
CRANKSHAFT POSITION SENSOR
DESCRIPTION
page
KNOCK SENSOR—2.4L . . . . . . . . . . . . . . . . . . . . 11
SPECIFICATIONS
IGNITION COIL . . . . . . . . . . . . . . . . . . . . . . . . . . 12
SPARK PLUG. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
TORQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
SPARK PLUG CABLE RESISTANCE—2.4L. . . . . . 13
FIRING ORDER—2.4L . . . . . . . . . . . . . . . . . . . . . 13
weight has machined into it two sets of four timing
reference notches and a 60 degree signature notch
(Fig. 2). From the crankshaft position sensor input
the PCM determines engine speed and crankshaft
angle (position).
The crankshaft position sensor mounts to the
engine block behind the generator, near the oil filter
(Fig. 7).
Fig. 2 Timing Reference Notches
1
2
3
4
Fig. 1 Crankshaft Position Sensor
1 – CRANKSHAFT POSITION SENSOR
2 – OIL FILTER
OPERATION
The PCM determines what cylinder to fire from the
crankshaft position sensor input and the camshaft
position sensor input. The second crankshaft counter-
–
–
–
–
60° NOTCH
CRANKSHAFT POSITION SENSOR
TIMING NOTCHES
CRANKSHAFT COUNTERWEIGHT
The notches generate pulses from high to low in
the crankshaft position sensor output voltage. When
a metal portion of the counterweight aligns with the
crankshaft position sensor, the sensor output voltage
goes low (less than 0.3 volts). When a notch aligns
with the sensor, voltage switches high (5.0 volts). As
a group of notches pass under the sensor, the output
voltage switches from low (metal) to high (notch)
then back to low.
If available, an oscilloscope can display the square
wave patterns of each voltage pulse. From the width
of the output voltage pulses, the PCM calculates
8D - 8
IGNITION SYSTEM
NS
DESCRIPTION AND OPERATION (Continued)
engine speed. The width of the pulses represent the
amount of time the output voltage stays high before
switching back to low. The period of time the sensor
output voltage stays high before switching back to
low is referred to as pulse width. The faster the
engine is operating, the smaller the pulse width on
the oscilloscope.
By counting the pulses and referencing the pulse
from the 60 degree signature notch, the PCM calculates crankshaft angle (position). In each group of
timing reference notches, the first notch represents
69 degrees before top dead center (BTDC). The second notch represents 49 degrees BTDC. The third
notch represents 29 degrees. The last notch in each
set represents 9 degrees before top dead center
(TDC).
The timing reference notches are machined to a
uniform width representing 13.6 degrees of crankshaft rotation. From the voltage pulse width the
PCM tells the difference between the timing reference notches and the 60 degree signature notch. The
60 degree signature notch produces a longer pulse
width than the smaller timing reference notches. If
the camshaft position sensor input switches from
high to low when the 60 degree signature notch
passes under the crankshaft position sensor, the
PCM knows cylinder number one is the next cylinder
at TDC.
Fig. 3 Target Magnet
1 – REAR OF CYLINDER HEAD
2 – TARGET MAGNET
CAMSHAFT POSITION SENSOR
DESCRIPTION
The camshaft position sensor attaches to the rear
of the cylinder head (Fig. 1). A target magnet
attaches to the rear of the camshaft and indexes to
the correct position (Fig. 3).
OPERATION
The PCM determines fuel injection synchronization
and cylinder identification from inputs provided by
the camshaft position sensor and crankshaft position
sensor. From the two inputs, the PCM determines
crankshaft position.
The target magnet has four different poles
arranged in an asymmetrical pattern. As the target
magnet rotates, the camshaft position sensor senses
the change in polarity (Fig. 4). The sensor output
switch switches from high (5.0 volts) to low (0.30
volts) as the target magnet rotates. When the north
pole of the target magnet passes under the sensor,
the output switches high. The sensor output switches
low when the south pole of the target magnet passes
underneath.
Fig. 4 Target Magnet Polarity
1 – TARGET MAGNET
REMOVAL AND INSTALLATION
SPARK PLUG CABLE SERVICE—2.4L
The cables insulate the spark plugs and covers the
top of the spark plug tube (Fig. 5). To remove the
cables, lightly grasp the top of the cable. Rotate the
insulator 90° and pull straight up. To replace the
cables, disconnect the cable from the ignition coil.
Ensure the #1 and #4 cables run under the #2
and #3 ignition coil towers. Keep #4 cable away
from the oil fill cap.
IGNITION SYSTEM
NS
8D - 9
REMOVAL AND INSTALLATION (Continued)
Fig. 5 Spark Plug Cables
1 – IGNITION COIL
2 – MAP SENSOR
3 – SPARK PLUG CABLE AND BOOT
IGNITION COIL—2.4L
REMOVAL
(1) Remove spark plug cables from coil (Fig. 6).
Always twist the coil boots to break the seal with the
coil and pull straight back on the boot.
(2) Remove ignition coil electrical connector.
(3) Remove ignition coil mounting bolts, throttle
cable bracket or clip.
(4) Remove ignition coil.
INSTALLATION
(1) Install ignition coil.
(2) Tighten mounting screws to 12 N·m (105 in.
lbs.) torque.
(3) Transfer ignition cables to new coil pack. The
coil pack towers and cables are numbered with cylinder identification.
(4) Install ignition coil electrical connector.
Fig. 6 Ignition Coil Removal
1 – IGNITION COIL
2 – SPARK PLUG CABLE AND BOOT
CRANKSHAFT POSITION SENSOR
The crankshaft position sensor mounts to the
engine block behind the generator, just behind the oil
filter (Fig. 7).
REMOVAL
(1) Raise and support vehicle.
(2) Disconnect electrical connector from crankshaft
position sensor.
(3) Remove sensor mounting screw.
(4) Pull crankshaft position sensor straight out.
INSTALLATION
(1) Install sensor and push sensor down until contact is made. While holding the sensor in this position, and install and tighten the retaining bolt to
12.9 N·m (115 in. lbs.) torque.
CAMSHAFT POSITION SENSOR
The camshaft position sensor is mounted to the
rear of the cylinder head (Fig. 8).
8D - 10
IGNITION SYSTEM
NS
REMOVAL AND INSTALLATION (Continued)
(5) Loosen screw attaching target magnet to rear
of camshaft (Fig. 9).
Fig. 9 Target Magnet
1 – REAR OF CYLINDER HEAD
2 – TARGET MAGNET
Fig. 7 Crankshaft Position Sensor
1 – CRANKSHAFT POSITION SENSOR
2 – OIL FILTER
Fig. 8 Camshaft Position Sensor Location
1 – CAMSHAFT POSITION SENSOR
REMOVAL
(1) Disconnect the filtered air tube from the throttle body and air cleaner housing. Disconnect the air
tube from the oil separator hose. Remove filtered air
tube.
(2) Remove the air cleaner inlet tube.
(3) Disconnect engine harness connector from camshaft position sensor.
(4) Remove camshaft position sensor mounting
screws. Remove sensor.
INSTALLATION
The target magnet has locating dowels that fit into
off-set machined locating holes in end of the camshaft (Fig. 10).
Fig. 10 Target Magnet Installation
1 – TARGET MAGNET
2 – OFF-SET ALIGNMENT TABS
3 – OFF-SET ALIGNMENT HOLES
(1) Install target magnet in end of camshaft.
Tighten mounting screw to 5.65 N·m (50 in. lbs.)
torque.
(2) Install a new O-ring on sensor.
(3) Install camshaft position sensor. Tighten sensor
mounting screws to 12.9 N·m (115 in. lbs.) torque.
(4) Attach engine harness connector to camshaft
position sensor.
IGNITION SYSTEM
NS
8D - 11
REMOVAL AND INSTALLATION (Continued)
(2) Attach electrical connector to knock sensor.
(5) Install air cleaner inlet tube and filtered air
tube.
KNOCK SENSOR—2.4L
The knock sensor threads into the side of the cylinder block in front of the starter (Fig. 11).
REMOVAL
(1) Disconnect electrical connector from knock sensor.
(2) Use a crow foot socket to remove the knock
sensors.
INSTALLATION
(1) Install knock sensor. Tighten knock sensor to
10 N·m (7 ft. lbs.) torque. Over or under tightening effects knock sensor performance, possibly
causing improper spark control.
Fig. 11 Knock Sensor
1
2
3
4
–
–
–
–
GENERATOR
INTAKE MANIFOLD
KNOCK SENSOR
STARTER
8D - 12
IGNITION SYSTEM
NS
SPECIFICATIONS
IGNITION COIL
Coil Manufacture
Primary Resistance at 21°C-27°C
(70°F-80°F)
Secondary Resistance at 21°C-27°C
(70°F-80°F)
Weastec (Steel Towers)
0.45 to 0.65 Ohms
11,500 to 13,500 Ohms
Diamond (copper towers)
0.53 to 0.65 Ohms
10,900 to 14,700 Ohms
Coil Polarity
Coil Polarity
SPARK PLUG
Engine
Spark Plug
Gap
Thread Size
2.4L
RC12YC5
0.048 TO 0.053
14mm (3/4 in.) reach
TORQUE
DESCRIPTION . . . . . . . . . . . . . . . . . . . . TORQUE
2.4L Target Magnet Screw . . . . . 3 N·m (30 in. lbs.)
2.4L Camshaft Sensor Screw . . . . . . . . . . 12.9 N·m
(115 in. lbs.)
2.4L Crankshaft Sensor Screw . . . . . . . . . 12.9 N·m
(115 in. lbs.)
Ignition Switch . . . . . . . . . . . . . . 2 N·m (17 in. lbs.)
Spark Plugs . . . . . . . . . . . . . . . 28 N·m (60 in. lbs.)
IGNITION SYSTEM
NS
SPECIFICATIONS (Continued)
SPARK PLUG CABLE RESISTANCE—2.4L
CABLE
Maximum Resistance
#1 & #4
4.2K ohms
#2 & #3
3.2K ohms
FIRING ORDER—2.4L
FIRING ORDER—2.4L
8D - 13
8D - 14
IGNITION SYSTEM
NS
3.0L ENGINE
TABLE OF CONTENTS
page
DESCRIPTION AND OPERATION
CAMSHAFT POSITION SENSOR . . .
REMOVAL AND INSTALLATION
DISTRIBUTOR—3.0L . . . . . . . . . . . .
IGNITION COIL—3.OL . . . . . . . . . . .
CRANKSHAFT POSITION SENSOR .
CLEANING AND INSPECTION
DISTRIBUTOR CAP . . . . . . . . . . . . .
. . . . . . . . . . 14
. . . . . . . . . . 14
. . . . . . . . . . 15
. . . . . . . . . . 16
page
DISTRIBUTOR ROTOR—3.0L. . . . . . . . . . .
SPECIFICATIONS
SPARK PLUG. . . . . . . . . . . . . . . . . . . . . . .
TORQUE . . . . . . . . . . . . . . . . . . . . . . . . . .
SPARK PLUG CABLE RESISTANCE—3.0L.
FIRING ORDER—3.0L . . . . . . . . . . . . . . . .
. . . . . 17
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. 17
. 17
. 18
. 18
. . . . . . . . . . 16
DESCRIPTION AND OPERATION
CAMSHAFT POSITION SENSOR
DESCRIPTION
The 3.0L engine is equipped with a camshaft
driven mechanical distributor, containing a shaft
driven distributor rotor. The distributor is also
equipped with an internal camshaft position (fuel
sync) sensor (Fig. 1). This sensor provides fuel injection synchronization and cylinder identification to
the PCM.
OPERATION
The PCM determines fuel injection synchronization
and cylinder identification from inputs provided by
the camshaft position sensor and crankshaft position
sensor. From the two inputs, the PCM determines
crankshaft position.
The camshaft position sensor contains a hall effect
device called a sync signal generator. This sync signal generator detects a rotating pulse ring (shutter)
on the distributor shaft. The pulse ring rotates 180
through the sync signal generator. Its signal is used
in conjunction with the crankshaft position sensor to
differentiate between fuel injection and spark events.
It is also used to synchronize the fuel injectors with
their respective cylinders.
When the leading edge of the shutter enters the
sync signal generator, the interruption of magnetic
field causes the voltage to switch high. This causes a
sync signal of approximately 5 volts.
When the trailing edge of the shutter leaves the
sync signal generator, the change of magnetic field
causes the sync signal voltage to switch low to 0
volts.
Since the shutter rotates at half crankshaft speed, it
may take 1 engine revolution during cranking for the
PCM to determine the position of piston number 6.
Fig. 1 Camshaft Position Sensor—3.0L Engine
1 – DISTRIBUTOR
2 – ROTOR
3 – PULSE RING
REMOVAL AND INSTALLATION
DISTRIBUTOR—3.0L
REMOVAL
(1) Disconnect distributor connector from distributor (Fig. 2).
(2) Loosen distributor cap retaining screws.
(3) Lift cap of off distributor.
(4) Rotate engine crankshaft until the distributor
rotor points to the intake manifold plenum. Scribe a
mark on the plenum in line with the rotor. The scribe
IGNITION SYSTEM
NS
8D - 15
REMOVAL AND INSTALLATION (Continued)
air intake plenum. If engine was cranked while
distributor was removed, it will be necessary to
establish proper relationship between the distributor shaft and Number 1 piston position as
follows:
(a) Rotate the crankshaft until number one piston is at top of compression stroke.
(b) Rotate rotor to number one rotor terminal
(Fig. 4).
(c) Lower the distributor into the opening,
engaging distributor drive with drive on camshaft.
With distributor fully seated on engine, rotor
should be under the number 1 terminal.
Fig. 2 Distributor Electrical Connector—3.0L Engine
1
2
3
4
–
–
–
–
MAP SENSOR
DISTRIBUTOR (CMP SENSOR UNDER CAP)
CAMSHAFT SENSOR CONNECTOR
ENGINE COOLANT TEMPERATURE SENSOR
line indicates where to position the rotor when reinstalling the distributor.
(5) Remove distributor hold down nut (Fig. 3).
(6) Carefully lift the distributor from the engine.
Fig. 4 Distributor Cap Terminal Routing, View from
Top of Cap
(3) Install the distributor cap. Ensure sure all high
tension wires are firmly in the cap towers.
(4) Install hold-down nut and tighten (Fig. 3).
(5) Connect distributor electrical connector to distributor (Fig. 2).
IGNITION COIL—3.OL
The ignition coil is located at the back of the
intake manifold (Fig. 5).
REMOVAL
Fig. 3 Distributor Hold-Down
1 – HOLD DOWN NUT
(1)
(2)
(3)
(4)
Remove air cleaner assembly.
Disconnect ignition cable from coil.
Disconnect wiring harness connector from coil.
Remove coil mounting screws.
INSTALLATION
INSTALLATION
(1) Position distributor in engine. Make certain
that the O-ring is properly seated on distributor. If
O-ring is cracked or nicked replace with new one.
(2) Carefully engage distributor drive with gear on
camshaft. When the distributor is installed properly,
the rotor will be in line with previously scribe line on
(1) Loosely install ignition coil on intake manifold.
Tighten the intake manifold fastener to 13 N·m (115
in. lbs.) torque. Tighten ignition coil bracket fasteners to 10 N·m (96 in. lbs.) torque.
(2) Connect the wiring harness connector.
(3) Connect the coil to distributor ignition cable.
(4) Install the air cleaner assembly. Tighten the
air cleaner fasteners to 25 N·m (225 in. lbs.) torque.
8D - 16
IGNITION SYSTEM
NS
REMOVAL AND INSTALLATION (Continued)
INSTALLATION
NOTE: If the removed sensor is to be reinstalled,
clean off the old spacer on the sensor face. A NEW
SPACER must be attached to the sensor face before
installation. If the sensor is being replaced, confirm
that the paper spacer is attached to the face of the
new sensor (Fig. 7).
Fig. 5 Ignition Coil—3.0L Engine
1
2
3
4
5
–
–
–
–
–
INTAKE MANIFOLD
IGNITION COIL
IGNITION CABLE
IGNITION COIL BRACKET FASTENERS
ELECTRICAL CONNECTOR
CRANKSHAFT POSITION SENSOR
REMOVAL
(1) Raise and support vehicle.
(2) Disconnect crankshaft position sensor electrical
connector from the wiring harness connector (Fig. 6).
Fig. 7 Crankshaft Position Sensor and Spacer
1 – CRANKSHAFT POSITION SENSOR
2 – PAPER SPACER
(1) Install sensor in transaxle and push sensor
down until contact is made with the drive plate.
While holding the sensor in this position, and install
and tighten the retaining bolt to 11.9 N·m (105 in.
lbs.) torque.
(2) Raise and support vehicle.
(3) Connect crankshaft position sensor electrical
connector to the wiring harness connector.
CLEANING AND INSPECTION
DISTRIBUTOR CAP
Fig. 6 Crankshaft Position Sensor Connector
1 – CRANKSHAFT POSITION SENSOR
(3) Remove crankshaft position sensor retaining
bolt.
(4) Pull crankshaft position sensor straight up out
of the transaxle housing.
Remove the distributor cap and inspect the inside
for flashover, cracking of carbon button, lack of
spring tension on carbon button, cracking of cap, and
burned, worn terminals (Fig. 8). Also check for broken distributor cap towers. If any of these conditions
are present the distributor cap and/or cables should
be replaced.
When replacing the distributor cap, transfer spark
plug wires from the original cap to the new cap one
at a time. Ensure that each wire is installed into the
tower of the new cap that corresponds to its tower
position in the original cap. Fully seat the wires into
the towers. If necessary, refer to the engine firing
order diagram.
IGNITION SYSTEM
NS
8D - 17
CLEANING AND INSPECTION (Continued)
DISTRIBUTOR ROTOR—3.0L
Replace the rotor if it is cracked, the tip is excessively burned or heavily scaled (Fig. 9).
Fig. 8 Distributor Cap Inspection—Typical
1
2
3
4
–
–
–
–
CHARRED OR ERODED TERMINALS
WORN OR DAMAGED BUTTON
CARBON PATH
CRACK
Light scaling of the terminals can be cleaned with
a sharp knife. If the terminals are heavily scaled,
replace the distributor cap.
A cap that is greasy, dirty or has a powder-like
substance on the inside should be cleaned with a
solution of warm water and a mild detergent. Scrub
the cap with a soft brush. Thoroughly rinse the cap
and dry it with a clean soft cloth.
Fig. 9 Rotor Inspection—Typical
1
2
3
4
–
–
–
–
INSUFFICIENT SPRING TENSION
CRACKS
EVIDENCE OF PHYSICAL CONTACT WITH CAP
ROTOR TIP CORRODED
SPECIFICATIONS
SPARK PLUG
Engine
Spark Plug
Gap
Thread Size
3.0L
RN11YC4
0.039 TO 0.044
14mm (3/4 in.) reach
TORQUE
DESCRIPTION . . . . . . . . . . . . . . . . . . . . TORQUE
Distributor Hold Down . . . . . . 14 N·m (124 in. lbs.)
Ignition Coil Bracket . . . . . . . . 10 N·m (96 in. lbs.)
Ignition Switch . . . . . . . . . . . . . . 2 N·m (17 in. lbs.)
Spark Plugs . . . . . . . . . . . . . . . 28 N·m (60 in. lbs.)
8D - 18
IGNITION SYSTEM
NS
SPECIFICATIONS (Continued)
SPARK PLUG CABLE RESISTANCE—3.0L
CABLE
Maximum Resistance
#1
14.0K ohms
#2
10.4K ohms
#3
14.9K ohms
#4
11.5K ohms
#5
17.5K ohms
#6
10.3K ohms
Coil Lead
11.1K ohms
FIRING ORDER—3.0L
SPARK PLUG WIRE ROUTING—3.0L ENGINE
IGNITION SYSTEM
NS
8D - 19
3.3/3.8L ENGINE
TABLE OF CONTENTS
page
REMOVAL AND INSTALLATION
SPARK PLUG CABLE SERVICE—3.3/3.8L
ENGINES . . . . . . . . . . . . . . . . . . . . . . . . .
SPARK PLUG SERVICE—3.3/3.8L ENGINES
IGNITION COIL . . . . . . . . . . . . . . . . . . . . . .
CRANKSHAFT POSITION SENSOR . . . . . . .
CAMSHAFT POSITION SENSOR . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. 19
. 20
. 21
. 21
. 22
REMOVAL AND INSTALLATION
SPARK PLUG CABLE SERVICE—3.3/3.8L
ENGINES
WARNING: The ignition cables should not be
removed while the engine is hot. This could cause
sever injury/burns and can cause damage to the
ignition cables.
The spark plug boot heat shield needs to be
installed correctly on the boot before being installed
on the engine (Fig. 1). If it is not installed correctly
engine misfire would occur.
Fig. 1 Spark Plug Boot/Heat Shield Orientation
Do not use pliers to pull the boot/heat shield
assembly from the spark plugs. This will damage the
shield assembly.
Spark plug boot heat shields must be replaced if
they are bent or damaged. It is extremely important
the shield is reinstalled correctly as shown. The bottom of the spark plug heat shield must make contact
with the spark plug socket hex.
page
KNOCK SENSOR—3.3/3.8L . . . . . . . . . . . . . . .
SPECIFICATIONS
IGNITION COIL . . . . . . . . . . . . . . . . . . . . . . . .
SPARK PLUG. . . . . . . . . . . . . . . . . . . . . . . . . .
TORQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPARK PLUG CABLE RESISTANCE—3.3/3.8L .
FIRING ORDER—3.3/3.8L . . . . . . . . . . . . . . . .
. . 22
.
.
.
.
.
. 24
. 25
. 25
. 25
. 25
CAUTION: Never coat the inside of spark plug
boots with silicone grease. Some types of silicone
grease can damage the ignition cable conductor.
SPARK PLUG CABLES #3 AND #5
REMOVAL
(1) Remove the resonator.
(2) Grasp the spark plug boot/heat shield as close
as possible to the spark plug. Twist the boot
slightly to break its seal with the plug and pull
straight back. Do not use pliers, pull on the
ignition cable, or pull the spark plug boot at an
angle. This could damage the spark plug insulator,
terminal, or the cable insulation. Wipe spark plug
insulator clean with a dry cloth before installation.
(3) Remove the cable from the retaining bracket.
Make sure that they are also detached from the rear
retaining clip mounted on the rear of the intake
manifold.
INSTALLATION
(1) When installing the spark plug cables, make
sure the coil and spark plug insulator and terminals
are fully seated. A click sound should be heard or
terminal engagement is felt when the terminals
are properly attached.
(2) Install the cable into the retaining bracket.
Make sure that they are also attached to the rear
retaining clip mounted on the rear of the intake
manifold.
(3) Install the resonator.
SPARK PLUG CABLE #1
REMOVAL
(1) Remove the accessory drive belt, refer to the
Cooling section.
(2) Remove the four bolts from the upper half of
the generator bracket.
8D - 20
IGNITION SYSTEM
NS
REMOVAL AND INSTALLATION (Continued)
(3) Push the Generator rearward.
(4) Grasp the spark plug boot/shield assembly as
close as possible to the spark plug. Twist the boot
slightly to break its seal with the plug and pull
straight back. Do not use pliers, pull on the
ignition cable, or pull the spark plug boot at an
angle. This could damage the spark plug insulator,
terminal, or the cable insulation. Wipe spark plug
insulator clean with a dry cloth before installation.
(5) Remove the cable from the retaining bracket.
INSTALLATION
(1) When installing the spark plug cables, make
sure the coil and spark plug insulator and terminals
are fully seated. A click sound should be heard or
terminal engagement is felt when the terminals
are properly attached.
(2) Rotate Generator back into place.
(3) Install upper Generator bracket with the four
bolts.
(4) Install the accessory drive belt, refer to the
Cooling section.
SPARK PLUG SERVICE—3.3/3.8L ENGINES
WARNING: The ignition cables should not be
removed while the engine is hot. This could cause
server injury/burns and can cause damage to the
ignition cables.
Use extreme care when removing and installing
the spark plug cables.
The spark plug boot heat shield needs to be
installed correctly on the boot before being installed
on the engine (Fig. 1). If it is not installed correctly
engine misfire would occur.
Do not use pliers to pull the boot/heat shield
assembly from the spark plugs. This will damage the
shield assembly.
SPARK PLUG #3 AND #5
REMOVAL
(1) Remove the resonator.
(2) Remove intake strut to cylinder head bolt at
cylinder head.
(3) Loosen bolt for intake strut at intake.
(4) Swing strut away.
(5) Grasp the spark plug boot/shield assembly as
close as possible to the spark plug. Twist the boot/
shield assembly slightly to break the seal with
the plug and pull straight out. Do not use pliers, pull on the ignition cable, or pull the spark
plug boot at an angle. This could damage the
spark plug insulator, terminal, heat shield or the
insulation. Wipe spark plug insulator clean with a
dry cloth before installation.
(6) Remove spark plug
INSTALLATION
(1) Install spark plug and tighten to 28 N·m (20 ft.
lbs.).
(2) When installing the spark plug cables, make
sure spark plug insulator and terminals are fully
seated. A click sound should be heard or felt
when the terminals are properly attached.
(3) Install the cable into the retaining bracket.
Make sure that they are also attached to the rear
retaining clip mounted on the rear of the intake
manifold.
(4) Swing strut back into place.
(5) Install intake strut bolt to cylinder head at cylinder head.
(6) Tighten bolt to intake strut at intake.
(7) Tighten bolt at cylinder head.
(8) Install the resonator.
SPARK PLUG #1
REMOVAL
(1) Remove the accessory drive belt, refer to the
Cooling section.
(2) Remove the 4 bolts from the upper half of the
generator bracket.
(3) Push the Generator rearward.
(4) Grasp the spark plug boot/shield assembly as
close as possible to the spark plug. Twist the boot/
shield assembly slightly to break its seal with
the plug and pull straight out. Do not use pliers, pull on the ignition cable, or pull the spark
plug boot at an angle. This could damage the
spark plug insulator, terminal, or the insulation.
Wipe spark plug insulator clean with a dry cloth
before installation.
(5) Remove spark plug
INSTALLATION
(1) Install spark plug and tighten to 28 N·m (20 ft.
lbs.).
(2) When installing the spark plug cables, make
sure the coil or spark plug insulator and terminals
are fully seated. A click sound should be heard or
felt when the terminals are properly attached.
(3) Pull Generator back into place.
(4) Install upper Generator bracket with the 4
bolts.
(5) Install the accessory drive belt, refer to the
Cooling section.
IGNITION SYSTEM
NS
8D - 21
REMOVAL AND INSTALLATION (Continued)
IGNITION COIL
REMOVAL
(1) Remove spark plug cables from coil (Fig. 2).
Always twist the spark plug boots to break the seal
with the plug and pull straight back on the boot.
(2) Remove ignition coil electrical connector.
(3) Remove ignition coil mounting screws.
(4) Remove ignition coil.
Fig. 3 Crankshaft Position Sensor Connector
1 – CRANKSHAFT POSITION SENSOR
2 – TRANSAXLE HOUSING
SPACER must be attached to the sensor face before
installation. If the sensor is being replaced, confirm
that the paper spacer is attached to the face of the
new sensor (Fig. 4).
Fig. 2 Ignition Coil Removal
1 – IGNITION COILS FASTENERS
2 – IGNITION COILS ELECTRICAL CONNECTOR
INSTALLATION
(1) Install ignition coil.
(2) Install ignition coil mounting screws. Tighten
mounting screws to 12 N·m (105 in. lbs.) torque.
(3) Install ignition coil electrical connector.
(4) Transfer spark plug cables to new coil pack.
The coil pack towers and cables are numbered with
the cylinder identification.
CRANKSHAFT POSITION SENSOR
REMOVAL
(1) Raise and support vehicle.
(2) Disconnect crankshaft position sensor electrical
connector from the wiring harness connector (Fig. 3).
(3) Remove crankshaft position sensor retaining
bolt.
(4) Pull crankshaft position sensor straight up out
of the transaxle housing.
INSTALLATION
NOTE: If the removed sensor is to be reinstalled,
clean off the old spacer on the sensor face. A NEW
Fig. 4 Crankshaft Position Sensor and Spacer
1 – CRANKSHAFT POSITION SENSOR
2 – PAPER SPACER
(1) Install sensor in transaxle and push sensor
down until contact is made with the drive plate.
While holding the sensor in this position, and install
and tighten the retaining bolt to 11.9 N·m (105 in.
lbs.) torque.
(2) Lower vehicle.
(3) Connect crankshaft position sensor electrical
connector to the wiring harness connector.
8D - 22
IGNITION SYSTEM
NS
REMOVAL AND INSTALLATION (Continued)
CAMSHAFT POSITION SENSOR
(3) Rotate sensor away from block (Fig. 7).
REMOVAL
(1) Disconnect camshaft position sensor electrical
connector from the wiring harness connector (Fig. 5).
Fig. 7 Camshaft Sensor Removal/Installation
1 – CAMSHAFT POSITION SENSOR
Fig. 5 Camshaft Position Sensor
1 – FUEL LINE TO RAIL
2 – CAMSHAFT POSITION SENSOR CONNECTOR
3 – THERMOSTAT HOUSING
(2) Remove bolt holding sensor (Fig. 6). There is a
hole in the bracket for tool access to the sensor
bolt.
(4) Pull sensor up out of the chain case cover. Do
not pull on the sensor lead. There is an O-ring on
the sensor case. The O-ring may make removal difficult. A light tap to top of sensor prior to removal may
reduce force needed for removal.
INSTALLATION
If the removed sensor is reinstalled, clean off
the old spacer on the sensor face. A NEW
SPACER must be attached to the face before
installation. Inspect O-ring for damage, replace if
necessary. If the sensor is being replaced, confirm
that the paper spacer is attached to the face and
O-ring is positioned in groove of the new sensor (Fig.
8).
(1) Apply a couple drops of clean engine oil to the
O-ring prior to installation.
(2) Install sensor in the chain case cover and
rotate into position.
(3) Push sensor down until contact is made with
the camshaft gear. While holding the sensor in this
position, install and tighten the retaining bolt 14
N·m (125 in. lbs.) torque.
(4) Connect camshaft position sensor electrical
connector to harness connector.
KNOCK SENSOR—3.3/3.8L
The knock sensor threads into the side of the cylinder block in front of the starter (Fig. 9).
REMOVAL
Fig. 6 Camshaft Sensor Bolt Removal/Installation
1 – CAMSHAFT POSITION SENSOR
2 – SOCKET
3 – RATCHET HANDLE
(1) Disconnect electrical connector from knock sensor.
(2) Use a crow foot socket to remove the knock
sensor.
IGNITION SYSTEM
NS
8D - 23
REMOVAL AND INSTALLATION (Continued)
(2) Attach electrical connector to knock sensor.
Fig. 8 Camshaft Position Sensor and Spacer
1 – ELECTRICAL CONNECTOR
2 – O-RING
3 – PAPER SPACER
INSTALLATION
(1) Install knock sensor. Tighten knock sensor to
10 N·m (7 ft. lbs.) torque. Over or under tightening effects knock sensor performance, possibly
causing improper spark control.
Fig. 9 Knock Sensor
1 – COMBINATION OIL PRESSURE SWITCH AND SENDING
UNIT
2 – KNOCK SENSOR
8D - 24
IGNITION SYSTEM
NS
SPECIFICATIONS
IGNITION COIL
Coil Manufacture
Primary Resistance at 21°C-27°C
(70°F-80°F)
Secondary Resistance at 21°C-27°C
(70°F-80°F)
Diamond Electric (Brass
Towers)
0.45 TO 0.65 Ohms
7,000 to 15,800 Ohms
Coil Polarity
1 – PRIMARY CONNECTOR
2 – DIAMOND (BRASS TOWERS)
IGNITION SYSTEM
NS
8D - 25
SPECIFICATIONS (Continued)
SPARK PLUG
Engine
Spark Plug
Gap *
Thread Size
3.3L
RN14PMP5
0.048 TO 0.053
14mm (3/4 in.) reach
3.8L
RN14PMP5
0.048 TO 0.053
14mm (3/4 in. ) reach
* New Spark Plug Gap
TORQUE
DESCRIPTION . . . . . . . . . . . . . . . . . . . . TORQUE
3.3L Camshaft Position sensor Screw . . . . . 12 N·m
(105 in. lbs.)
3.3L Engine Coolant Sensor . . . . 7 N·m (60 in. lbs.)
3.3L Crankshaft Position Sensor Screw . . . 12 N·m
(105 in. lbs.)
3.3/3.8L Ignition Coil . . . . . . . 12 N·m (105 in. lbs.)
Ignition Switch . . . . . . . . . . . . . . 2 N·m (17 in. lbs.)
Spark Plugs . . . . . . . . . . . . . . . . 28 N·m (20 ft. lbs.)
SPARK PLUG CABLE RESISTANCE—3.3/3.8L
CABLE
Maximum Resistance
#1
18.5K ohms
#2
15.5K ohms
#3
20.4K ohms
#4
21.2K ohms
#5
27.7K ohms
#6
26.7K ohms
FIRING ORDER—3.3/3.8L
The firing order for 3.3L and 3.8L engines is 1-2-34-5-6.
Firing Order—3.3/3.8L
8D - 26
IGNITION SYSTEM
NS
IGNITION SWITCH AND LOCK CYLINDER
TABLE OF CONTENTS
page
page
DESCRIPTION AND OPERATION
IGNITION INTERLOCK . . . . . . . . . . . . . . . . . . . . . 26
LOCK KEY CYLINDER . . . . . . . . . . . . . . . . . . . . . 26
REMOVAL AND INSTALLATION
IGNITION SWITCH . . . . . . . . . . . . . . . . . . . . . . . . 26
LOCK KEY CYLINDER . . . . . . . . . . . . . . . . . . . . . 29
DESCRIPTION AND OPERATION
IGNITION INTERLOCK
OPERATION
All vehicles equipped with automatic transaxles
have an interlock system. The system prevents shifting the vehicle out of Park unless the ignition lock
cylinder is in the Unlock, Run or Start position. In
addition, the operator cannot rotate the key to the
lock position unless the shifter is in the park position. On vehicles equipped with floor shift refer to
the - Transaxle for Automatic Transmission Shifter/
Ignition Interlock.
LOCK KEY CYLINDER
Fig. 1 Ignition Lock Cylinder Detents
DESCRIPTION
The lock cylinder is inserted in the end of the
housing opposite the ignition switch.
OPERATION
The ignition key rotates the cylinder to 5 different
detents (Fig. 1) :
• Accessory
• Off (lock)
• Unlock
• On/Run
• Start
REMOVAL AND INSTALLATION
IGNITION SWITCH
The ignition switch attaches to the lock cylinder
housing on the end opposite the lock cylinder (Fig. 2).
For ignition switch terminal and circuit identification, refer to the Wiring Diagrams section.
Fig. 2 Ignition Switch—Viewed From Below Column
1 – IGNITION SWITCH
2 – LOCK CYLINDER HOUSING
3 – RETAINING TABS
IGNITION SYSTEM
NS
8D - 27
REMOVAL AND INSTALLATION (Continued)
REMOVAL
(1) Disconnect negative cable from battery.
(2) Remove steering column cover retaining screws
(Fig. 3).
Fig. 3 Steering Column Cover
1 – SCREWS
2 – STEERING COLUMN COVER
Fig. 5 Steering Column Shroud Screws
(3) Remove parking brake release cable from handle (Fig. 4).
1 – STEERING WHEEL
2 – SCREWS
3 – LOWER STEERING COLUMN SHROUD
(5) Place key cylinder in RUN position. Depress
lock cylinder retaining tab and remove key cylinder
(Fig. 6).
Fig. 4 Parking Brake Release Cable
1 – PARKING BRAKE CABLE
2 – PARKING BRAKE HANDLE
(4) Remove screws holding steering
shrouds (Fig. 5) and remove lower shroud.
column
Fig. 6 Lock Cylinder Retaining Tab
1 – IGNITION SWITCH
2 – RETAINING TAB
8D - 28
IGNITION SYSTEM
NS
REMOVAL AND INSTALLATION (Continued)
(6) Remove ignition switch mounting screw (Fig. 7)
with a #10 Torxt tamper proof bit.
Fig. 9 Removing Ignition Switch
Fig. 7 Ignition Switch Mounting Screw
1 – IGNITION SWITCH
2 – RETAINING TAB
1 – MOUNTING SCREW
2 – IGNITION SWITCH
(7) Depress retaining tab (Fig. 3) or (Fig. 8) and
gently pry ignition switch from steering column (Fig.
9).
Fig. 8 Ignition Switch Retaining Tab
1 – IGNITION SWITCH
2 – RETAINING TAB
(8) Disconnect electrical connectors from ignition
switch and remove switch (Fig. 10).
INSTALLATION
(1) Ensure the ignition switch is in the RUN position and the actuator shaft in the lock housing is in
the RUN position.
(2) Install electrical connectors to ignition switch.
Fig. 10 Ignition Switch Connectors
1 – KEY IN SWITCH
2 – PRNDL SWITCH
3 – IGNITION SWITCH
(3) Carefully install the ignition switch. The
switch will snap over the retaining tabs (Fig. 11).
Install mounting screw (Fig. 7).
(4) Install upper and lower shrouds.
(5) Install key cylinder (cylinder retaining tab will
depress only in the RUN position).
(6) Connect negative cable to battery.
IGNITION SYSTEM
NS
8D - 29
REMOVAL AND INSTALLATION (Continued)
(2) The shaft at the end of the lock cylinder aligns
with the socket in the end of the housing. To align
the socket with the lock cylinder, ensure the socket is
in the Run position (Fig. 12).
Fig. 11 Ignition Switch Installation
1 – IGNITION SWITCH
2 – ACTUATOR SHAFT
3 – RETAINING TABS
Fig. 12 Socket in Lock Cylinder Housing
(7) Check for proper operation of ignition switch
and key-in warning switch.
LOCK KEY CYLINDER
REMOVAL
(1) Disconnect negative cable from battery.
(2) Remove steering column cover retaining screws
(Fig. 3).
(3) Remove screws holding steering column
shrouds (Fig. 5) and remove lower shroud.
(4) Place key cylinder in RUN position. Depress
lock cylinder retaining tab and remove key cylinder
(Fig. 6).
INSTALLATION
(1) Install key in lock cylinder. Turn key to run
position (retaining tab on lock cylinder can be
depressed).
1 – LOCK CYLINDER HOUSING
2 – SOCKET
(3) Align the lock cylinder with the grooves in the
housing. Slide the lock cylinder into the housing
until the tab sticks through the opening in the housing.
(4) Turn the key to the Off position. Remove the
key.
(5) Install lower steering column shroud.
(6) Install steering column cover.
(7) Connect negative cable to battery.
Download PDF