(2) Install bolt to hold bottom of generator to lower
pivot bracket.
(3) Place B+ terminal in position on generator.
(4) Install nut to hold B+ wire terminal to back of
generator.
(5) Connect the push-in field wire connector into
back of generator.
(6) Rotate generator forward away from dash
panel.
(7) Place generator mount bracket in position on
vehicle.
(8) Install bolt to hold top of generator to mount
bracket.
(9) Install bolts to hold outside of generator mount
bracket to generator mount plate.
(10) Install bolt to hold top of generator mount
bracket to engine air intake plenum.
(11) Install accessory drive belt, refer to Group 7,
Cooling System for proper procedures.
(12) Install windshield wiper housing, refer to
Group 8K, Windshield Wipers and Washers for
proper procedures.
(13) Connect battery negative cable.
(14) Verify generator charge rate.SPECIFICATIONS
GENERATOR
Part number is located on the side of the generator.
TORQUE
DESCRIPTION TORQUE
Battery Hold Down Bolt.......14N´m(125 in. lbs.)
Generator Mounting Bolts......54N´m(40ft.lbs.)
Generator B+ Terminal.........9N´m(75in.lbs.)
Starter Mounting Bolts.........54N´m(40ft.lbs.)
Starter Solenoid Battery Nut. . . .10 N´m (90 in. lbs.)
TypePart Num-
berAmperage out-
put
Nippondenso 90 A
HS4727220 86 Amp
Nippondenso 120 A
HS4727221 98 Amp
NSCHARGING SYSTEM 8C - 11
REMOVAL AND INSTALLATION (Continued)
IGNITION SYSTEM
CONTENTS
page page
GENERAL INFORMATION................... 1
2.4L ENGINE............................ 16
3.0L ENGINE............................ 233.3/3.8L ENGINE........................ 28
IGNITION SWITCH AND LOCK CYLINDER..... 35
GENERAL INFORMATION
INDEX
page page
GENERAL INFORMATION
AUTOMATIC SHUTDOWN (ASD) RELAY....... 4
CAMSHAFT POSITION SENSOR............. 5
CRANKSHAFT POSITION SENSOR........... 5
ENGINE COOLANT TEMPERATURE (ECT)
SENSOR.............................. 6
IGNITION COIL.......................... 4
IGNITION SYSTEM....................... 2
INTRODUCTION......................... 1
KNOCK SENSOR......................... 7
LOCK KEY CYLINDER..................... 7
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSOR.............................. 6
POWERTRAIN CONTROL MODULE........... 1
SPARK PLUG CABLE...................... 3
SPARK PLUGSÐ2.4/3.0L................... 2
SPARK PLUGSÐ3.3/3.8L................... 2
THROTTLE POSITION SENSOR (TPS)........ 7DIAGNOSIS AND TESTING
CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR......... 11
CHECK COIL TESTÐ2.4L.................. 9
CHECK COIL TESTÐ3.3/3.8L................ 9
ENGINE COOLANT TEMPERATURE SENSOR . . 11
FAILURE TO START TEST................. 10
IGNITION TIMING PROCEDURE............ 11
INTAKE AIR TEMPERATURE SENSOR........ 11
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSOR TEST........................ 11
SPARK PLUG CONDITION................. 11
TESTING FOR SPARK AT COILÐ2.4/3.3/3.8L
ENGINES............................. 8
TESTING FOR SPARK AT COILÐ3.0L......... 8
THROTTLE POSITION SENSOR............ 13
SERVICE PROCEDURES
IGNITION TIMING PROCEDURE............ 15
POWERTRAIN CONTROL MODULE.......... 13
SPARK PLUG GAP ADJUSTMENT........... 13
GENERAL INFORMATION
INTRODUCTION
This group describes the ignition systems for the
2.4, 3.0, and 3.3/3.8L engines.
On Board Diagnostics is described in Group 25 -
Emission Control Systems.
Group 0 - Lubrication and Maintenance, contains
general maintenance information for ignition related
items. The Owner's Manual also contains mainte-
nance information.
POWERTRAIN CONTROL MODULE
The ignition system is regulated by the Powertrain
Control Module (PCM) (Fig. 1). The PCM supplies
battery voltage to the ignition coil through the Auto
Shutdown (ASD) Relay. The PCM also controls
ground circuit for the ignition coil. By switching the
ground path for the coil on and off, the PCM adjusts
ignition timing to meet changing engine operating
conditions.
During the crank-start period the PCM advances
ignition timing a set amount. During engine opera-
tion, the amount of spark advance provided by the
PCM is determined by the following input factors:
NSIGNITION SYSTEM 8D - 1
Clean Spark Plug cables with a cloth moistened
with a non-flammable solvent. Wipe the cables dry.
Check for brittle or cracked insulation.
SPARK PLUG CABLESÐ3.3/3.8L
The spark plug cables and spark plug boots are
made from high temperature silicone materials. The
spark plug boots utilize metal heat shields for ther-
mal 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 num-
bers. 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 condi-
tions 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
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/dielec-
tric failures.
IGNITION COIL
WARNING: THE DIRECT IGNITION SYSTEM GEN-
ERATES APPROXIMATELY 40,000 VOLTS. PER-
SONAL INJURY COULD RESULT FROM CONTACT
WITH THIS SYSTEM.
The ignition coil assembly consists of 3 indepen-
dent coils molded together (Fig. 4). The coil assembly
is mounted on the intake manifold. Spark plug cables
route to each cylinder from the coil. The coil fires two
spark plugs every power stroke. One plug is the cyl-
inder 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 Shut-
down (ASD) RelayÐPCM Output, in this section for
relay operation.
AUTOMATIC SHUTDOWN (ASD) RELAY
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 ele-
ments in the oxygen sensors.
The PCM controls the relay by switching the
ground path for the solenoid 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. Refer to Group 25,
On-Board Diagnostics. When the ignition switch is in
the On or Crank position, the PCM monitors the
crankshaft position sensor and camshaft position sen-
sor signals to determine engine speed and ignition
timing (coil dwell). If the PCM does not receive the
crankshaft position sensor and camshaft position sen-
sor signals when the ignition switch is in the Run
position, it will de-energize the ASD relay.
The ASD relay is located in the Power Distribution
Center (PDC). The PDC is located on the driver's
side inner fender well (Fig. 5). A label on the under-
side of the PDC cover identifies the relays and fuses
in the PDC.
Fig. 4 Ignition Coil Pack
8D - 4 IGNITION SYSTEMNS
GENERAL INFORMATION (Continued)
(3) Remove ignition cables from the secondary tow-
ers of the coil. Measure the secondary resistance of
the coil between the towers of each individual coil
(Fig. 21). Secondary resistance should be 7,000 to
15,800 ohms. Replace the coil if resistance is not
within tolerance.
FAILURE TO START TEST
This no-start test checks the camshaft position sen-
sor and crankshaft position sensor.
The Powertrain Control Module (PCM) supplies 8
volts to the camshaft position sensor and crankshaft
position sensor through one circuit. If the 8 volt sup-
ply circuit shorts to ground, neither sensor will pro-
duce a signal (output voltage to the PCM).
When the ignition key is turned and left in the On
position, the PCM automatically energizes the Auto
Shutdown (ASD) relay. However, the controller de-en-
ergizes the relay within one second because it has
not received a camshaft position sensor signal indi-
cating engine rotation.
During cranking, the ASD relay will not energize
until the PCM receives a camshaft position sensor
signal. Secondly, the ASD relay remains energized
only if the controller senses a crankshaft position
sensor signal immediately after detecting the cam-
shaft position sensor signal.
(1) Check battery voltage. Voltage should be
approximately 12.66 volts or higher to perform fail-
ure to start test.
(2) Disconnect the harness connector from the coil
pack.
(3) Connect a test light to the B+ (battery voltage)
terminal of the coil electrical connector and ground
as shown in (Fig. 22). The B+ wire for the DIS coil is
dark green with an orange tracer.Do not spread
the terminal with the test light probe.(4) Turn the ignition key to theON position.The
test light should flash On and then Off.Do not turn
the Key to off position, leave it in the On posi-
tion.
(a) If the test light flashes momentarily, the
PCM grounded the Auto Shutdown (ASD) relay.
Proceed to step 5.
(b) If the test light did not flash, the ASD relay
did not energize. The cause is either the relay or
one of the relay circuits. Use the DRB scan tool to
test the ASD relay and circuits. Refer to the appro-
priate Powertrain Diagnostics Procedure Manual.
Refer to the wiring diagrams section for circuit
information.
(5) Crank the engine. (If the key was placed in the
off position after step 4, place the key in the On posi-
tion before cranking. Wait for the test light to flash
once, then crank the engine.)
(6) If the test light momentarily flashes during
cranking, the PCM is not receiving a crankshaft posi-
tion sensor signal. Use the DRB scan tool to test the
crankshaft position sensor and sensor circuits. Refer
to the appropriate Powertrain Diagnostics Procedure
Manual. Refer to the wiring diagrams section for cir-
cuit information.
(7) If the test light did not flash during cranking,
unplug the crankshaft position sensor connector.
Turn the ignition key to the off position. Turn the
key to the On position, wait for the test light to
momentarily flash once, then crank the engine. If the
test light momentarily flashes, the crankshaft posi-
tion sensor is shorted and must be replaced. If the
light did not flash, the cause of the no-start is in
Fig. 21 Checking Ignition Coil Secondary
ResistanceFig. 22 Ignition Coil Engine Harness Connector
8D - 10 IGNITION SYSTEMNS
DIAGNOSIS AND TESTING (Continued)
29). The increase in electrode gap will be consider-
ably in excess of 0.001 in per 1000 miles of operation.
This suggests that a plug with a cooler heat range
rating should be used. Over advanced ignition tim-
ing, detonation and cooling system malfunctions also
can cause spark plug overheating.
THROTTLE POSITION SENSOR
To perform a complete test of the this sensor and
its circuitry, refer to the DRB scan tool and appropri-
ate Powertrain Diagnostics Procedures manual. To
test the throttle position sensor only, refer to the fol-
lowing:
The Throttle Position Sensor (TPS) can be tested
with a digital voltmeter (DVM). The center terminal
of the sensor is the output terminal. One of the other
terminals is a 5 volt supply and the remaining ter-
minal is ground.
Connect the DVM between the center and sensor
ground terminal. Refer to Group 8W - Wiring Dia-
grams for correct pinout.With the ignition switch in the ON position, check
the output voltage at the center terminal wire of the
connector. Check the output voltage at idle and at
Wide-Open-Throttle (WOT). At idle, TPS output volt-
age should be approximately 0.38 volts to 1.2 volts.
At wide open throttle, TPS output voltage should be
approximately 3.1 volts to 4.4 volts. The output volt-
age should gradually increase as the throttle plate
moves slowly from idle to WOT.
Check for spread terminals at the sensor and PCM
connections before replacing the TPS.
SERVICE PROCEDURES
SPARK PLUG GAP ADJUSTMENT
Check the spark plug gap with a gap gauge. If the
gap is not correct, adjust it by bending the ground
electrode (Fig. 30).
CAUTION: The Platinum pads can be damaged dur-
ing the measurement of checking the gap if extreme
care is not used.
Refer to 3.3/3.8L Spark Plug Gap Measurment in
this section.
POWERTRAIN CONTROL MODULE
REMOVAL
(1) Disconnect both cables from battery, negative
cable first.
(2) Remove 2 screws holding Power Distribution
Center (PDC) to bracket (Fig. 31).
(3) Remove heat shield from battery (Fig. 32).
(4) Remove nut and clamp holding battery to bat-
tery tray (Fig. 33).
(5) Remove battery from vehicle.
(6) Rotate PDC toward center of vehicle to remove
from rear bracket (Fig. 34).
Fig. 27 Chipped Electrode Insulator
Fig. 28 Preignition Damage
Fig. 29 Spark Plug Overheating
NSIGNITION SYSTEM 8D - 13
DIAGNOSIS AND TESTING (Continued)
(7) Pull PDC rearward to remove from front
bracket. Lay PDC aside to allow access to Powertrain
Control Module (PCM).
(8) Squeeze tabs on 40-way connector. Pull connec-
tor rearward to remove from PCM (Fig. 35). Remove
both way connectors.
(9) Remove 3 screws holding PCM to fender (Fig.
36).
(10) Remove PCM from vehicle.INSTALLATION
(1) Connect 2 40-Way electrical connectors to PCM
(Fig. 35).
(2) Install PCM. Tighten mounting screws.
(3) Install PDC bracket.
(4) Install battery.
Fig. 30 Setting Spark Plug Electrode GapÐTypical
Fig. 31 Power Distribution Center Retaining Screws
Fig. 32 Battery Heat Shield
Fig. 33 Battery Clamp
8D - 14 IGNITION SYSTEMNS
SERVICE PROCEDURES (Continued)
REMOVAL
(1) Disconnect negative cable from battery.
(2) Remove steering column cover retaining screws
(Fig. 3).
(3) Remove parking brake release cable from han-
dle (Fig. 4).
(4) Remove screws holding steering column
shrouds (Fig. 5) and remove lower shroud.
(5) Place key cylinder in RUN position. Depress
lock cylinder retaining tab and remove key cylinder
(Fig. 6).
(6) Remove ignition switch mounting screw (Fig. 7)
with a #10 Torxttamper proof bit.(7) Depress retaining tab (Fig. 3) or (Fig. 8) and
gently pry ignition switch from steering column (Fig.
9).
(8) Disconnect electrical connectors from ignition
switch and remove switch (Fig. 10).
Fig. 3 Steering Column Cover
Fig. 4 Parking Brake Release Cable
Fig. 5 Steering Column Shroud Screws
Fig. 6 Lock Cylinder Retaining Tab
8D - 36 IGNITION SYSTEMNS
REMOVAL AND INSTALLATION (Continued)
INSTALLATION
(1) Ensure the ignition switch is in the RUN posi-
tion and the actuator shaft in the lock housing is in
the RUN position.(2) Install electrical connectors to 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.
(7) Check for proper operation of ignition switch
and key-in warning switch.
Fig. 7 Ignition Switch Mounting Screw
Fig. 8 Ignition Switch Retaining Tab
Fig. 9 Removing Ignition Switch
Fig. 10 Ignition Switch Connectors
Fig. 11 Ignition Switch Installation
NSIGNITION SYSTEM 8D - 37
REMOVAL AND INSTALLATION (Continued)