2.4L ENGINE
INDEX
page page
DESCRIPTION AND OPERATION
CAMSHAFT POSITION SENSOR............ 17
CRANKSHAFT POSITION SENSOR.......... 16
FIRING ORDERÐ2.4L.................... 16
INTAKE AIR TEMPERATURE SENSORÐ2.4L . . . 17
REMOVAL AND INSTALLATION
CAMSHAFT POSITION SENSOR............ 19
CRANKSHAFT POSITION SENSOR.......... 19
ENGINE COOLANT TEMPERATURE SENSORÐ
2.4L................................. 20
IGNITION COILÐ2.4L..................... 18
INTAKE AIR TEMPERATURE SENSORÐ2.4L . . . 21KNOCK SENSORÐ2.4L................... 21
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSORÐ2.4/3.3/3.8L.................. 20
SPARK PLUG CABLE SERVICEÐ2.4L........ 18
SPARK PLUG SERVICE................... 18
THROTTLE POSITION SENSOR............ 20
SPECIFICATIONS
IGNITION COIL......................... 22
SPARK PLUG CABLE RESISTANCEÐ2.4L..... 22
SPARK PLUG........................... 22
TORQUE.............................. 22
DESCRIPTION AND OPERATION
FIRING ORDERÐ2.4L
CRANKSHAFT POSITION SENSOR
The PCM determines what cylinder to fire from the
crankshaft position sensor input and the camshaft
position sensor input. The second crankshaft counter-
weight has machined into it two sets of four timing
reference notches and a 60 degree signature notch
(Fig. 1). From the crankshaft position sensor input
the PCM determines engine speed and crankshaft
angle (position).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
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
FIRING ORDERÐ2.4L
Fig. 1 Timing Reference Notches
8D - 16 IGNITION SYSTEMNS
3.0L ENGINE
INDEX
page page
DESCRIPTION AND OPERATION
CAMSHAFT POSITION SENSOR............ 23
FIRING ORDERÐ3.0L.................... 23
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSOR............................. 23
REMOVAL AND INSTALLATION
CRANKSHAFT POSITION SENSOR.......... 25
ENGINE COOLANT TEMPERATURE SENSORÐ
3.0L................................. 25
IGNITION COILÐ3.OL.................... 24
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSORÐ3.0L........................ 24SPARK PLUG SERVICE................... 24
THROTTLE POSITION SENSOR............ 25
DISASSEMBLY AND ASSEMBLY
DISTRIBUTORÐ3.0L..................... 26
CLEANING AND INSPECTION
DISTRIBUTOR CAP...................... 26
DISTRIBUTOR ROTORÐ3.0L............... 27
SPECIFICATIONS
SPARK PLUG CABLE RESISTANCEÐ3.0L..... 27
SPARK PLUG........................... 27
TORQUE.............................. 27
DESCRIPTION AND OPERATION
FIRING ORDERÐ3.0L
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
The MAP sensor reacts to absolute pressure in the
intake manifold and provides an input voltage to the
Powertrain Control Module (PCM). As engine load
changes, manifold pressure varies. The changes in
engine load cause the MAP sensors resistance to
change. The change in MAP sensor resistance results
in a different input voltage to the PCM.
The input voltage level supplies the PCM with
information relating to ambient barometric pressure
during engine start-up (cranking) and engine load
while its operating. Based on MAP sensor voltage
and inputs from other sensors, the PCM adjusts
spark advance and the air-fuel mixture.
CAMSHAFT POSITION SENSOR
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 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 injec-
tion synchronization and cylinder identification to
the PCM.
The camshaft position sensor contains a hall effect
device callled a sync signal generator. This sync sig-
nal 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.
SPARK PLUG WIRE ROUTINGÐ3.0L ENGINE
NSIGNITION SYSTEM 8D - 23
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 orshort cir-
cuit 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 conduc-
tive, 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 com-
pressed 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. Refer to
Spark Plug Condition in this section.
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 COILÐ3.OL
The ignition coil is located at the back of the
intake manifold (Fig. 2).
REMOVAL
(1) Remove air cleaner assembly.
(2) Disconnect ignition cable from coil.
(3) Disconnect wiring harness connector from coil.
(4) Remove coil mounting screws.
INSTALLATION
(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 fasten-
ers 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.
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSORÐ3.0L
REMOVAL
(1) Remove vacuum hose and mounting screws
from manifold absolute pressure (MAP) sensor (Fig.
3).
(2) Disconnect electrical connector from sensor.
Remove sensor.
Fig. 1 Camshaft Position SensorÐ3.0L Engine
Fig. 2 Ignition CoilÐ3.0L Engine
8D - 24 IGNITION SYSTEMNS
DESCRIPTION AND OPERATION (Continued)
3.3/3.8L ENGINE
INDEX
page page
DESCRIPTION AND OPERATION
FIRING ORDERÐ3.3/3.8L................. 28
REMOVAL AND INSTALLATION
CAMSHAFT POSITION SENSOR............ 31
CRANKSHAFT POSITION SENSOR.......... 30
ENGINE COOLANT TEMPERATURE SENSOR . . 32
IGNITION COIL......................... 30
KNOCK SENSORÐ3.3/3.8L................ 32
MANIFOLD ABSOLUTE PRESSURE (MAP)
SENSOR............................. 32SPARK PLUG CABLE SERVICEÐ3.3/3.8L
ENGINES............................ 28
SPARK PLUG SERVICEÐ3.3/3.8L ENGINES . . . 29
THROTTLE POSITION SENSOR............ 32
SPECIFICATIONS
IGNITION COIL......................... 33
SPARK PLUG CABLE RESISTANCEÐ3.3/3.8L . . 34
SPARK PLUG........................... 33
TORQUE.............................. 34
DESCRIPTION AND OPERATION
FIRING ORDERÐ3.3/3.8L
The firing order for 3.3L and 3.8L engines is 1-2-3-
4-5-6.
REMOVAL AND INSTALLATION
SPARK PLUG CABLE SERVICEÐ3.3/3.8L 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.
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 bot-
tom of the spark plug heat shield must make contact
with the spark plug socket hex.
Firing OrderÐ3.3/3.8L
Fig. 1 Spark Plug Boot/Heat Shield Orientation
8D - 28 IGNITION SYSTEMNS
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
REMOVAL
(1) Disconnect electrical connector from MAP sen-
sor.
(2) Remove 2 screws holding sensor to intake man-
ifold (Fig. 9).
(3) Remove sensor from manifold.
INSTALLATION
Reverse the above procedure for installation.
ENGINE COOLANT TEMPERATURE SENSOR
The Engine Coolant Temperature (ECT) sensor is
located below the ignition coil (Fig. 10).
REMOVAL
(1) Drain cooling system until coolant level is
below sensor. Refer to Group 7, Cooling System.
(2) Remove electrical connector from coil (Fig. 11).
(3) Remove coil mounting screws.
(4) Rotate coil away from engine coolant tempera-
ture sensor.
(5) Disconnect electrical connector from engine
coolant temperature sensor.
(6) Remove sensor from engine.
INSTALLATION
(1) Tighten the sensor to 7 N´m (60 in. lbs.) torque.
(2) Connect electrical connector to sensor.
(3) Fill cooling system. Refer to Group 7, Cooling
System.
(4) Install coil. Tighten coil mounting screws to 12
N´m (105 in. lbs.) torque.
(5) Connect electrical connector to coil.
THROTTLE POSITION SENSOR
Refer to Group 14, Fuel Injection Section, for
Removal/Installation.
KNOCK SENSORÐ3.3/3.8L
The knock sensor threads into the side of the cyl-
inder block in front of the starter (Fig. 12).
Fig. 8 Camshaft Position Sensor and Spacer
Fig. 9 Manifold Absolute Pressure Sensor
Fig. 10 Engine Coolant Temperature Sensor
Fig. 11 Ignition Coil Removal
8D - 32 IGNITION SYSTEMNS
REMOVAL AND INSTALLATION (Continued)
BULB APPLICATION
INDEX
page page
GENERAL INFORMATION
INTRODUCTION......................... 25SPECIFICATIONS
EXTERIOR LAMP BULBS.................. 25
INTERIOR LAMP BULBS.................. 25
GENERAL INFORMATION
INTRODUCTION
The following Bulb Application Tables list the lamp
title on the left side of the column and trade number
or part number on the right.
CAUTION: Do not use bulbs that have a higher
candle power than the bulb listed in the Bulb Appli-
cation Table. Damage to lamp can result.
Do not touch halogen bulbs with fingers or other
possibly oily surfaces. Bulb life will be reduced.
If a halogen bulb is contaminated with oil, clean
bulb with denatured alcohol or ammonia based sol-
vent.
SPECIFICATIONS
EXTERIOR LAMP BULBS
LAMP BULB
Back-up...............................3057
CHMSL................................921
Fog Lamp...............................H3
FogLamp±T&C ........................9040
Headlamp..............................9007
Headlamp high beam ± T&C...............9005
Headlamp low beam ± T&C............9005 SLL
License Plate............................168
Parking/Turn Signal/Front Side Marker. . . .3157NA
Parking/Turn Signal ± T&C............4157NAK
Tail, Stop, Turn Signal and Side Marker......3057
Front Side Marker......................194NA
INTERIOR LAMP BULBS
LAMP BULB
ABS.................................PC194
AirBag ..............................PC194
Alarm Set (Security)....................PC194
Brake Warning.........................PC194
Center/Rear Reading Lamps.................578
Center/Rear Dome Lamps...................579
Check Engine Ind.......................PC194
Front Door Courtesy.......................567
Door Ajar Ind..........................PC194
Front Header Reading Lamp................567
Glove Box Lamp..........................194
High Beam Ind.........................PC194
Instrument Cluster.....................PC194
IP Bin/Ash Tray..........................161
Liftgate Flood Lamps......................567
Liftgate Ajar Ind.........................PC74
Low Fuel Ind..........................PC194
Oil Pressure Ind........................PC194
O/H Console Reading Lamps................579
Seat Belt Ind...........................PC74
Engine Temp Ind.......................PC194
Turn Signal...........................PC194
Engine Compartment Lamps................579
Visor Vanity Lamp....................6501966
Low Washer Fluid.......................PC74
Low Volts Warning.......................PC74
Cruise Indicator........................PC194
NSLAMPS 8L - 25
BULB APPLICATION
INDEX
page page
GENERAL INFORMATION
INTRODUCTION....................... 17
CLEANING AND INSPECTION
HEADLAMP CLEANING.................. 17SPECIFICATIONS
EXTERIOR LAMP BULBS................. 17
INTERIOR LAMP BULBS................. 17
GENERAL INFORMATION
INTRODUCTION
The following Bulb Application Tables list the lamp
title on the left side of the column and trade number
or part number on the right.
CAUTION: Do not use bulbs that have a higher
candle power than the bulb listed in the Bulb Appli-
cation Table. Damage to lamp can result.
Do not touch halogen bulbs with fingers or other
possibly oily surfaces. Bulb life will be reduced.
If a halogen bulb is contaminated with oil, clean
bulb with denatured alcohol or ammonia based sol-
vent.
CLEANING AND INSPECTION
HEADLAMP CLEANING
This vehicle is equipped with plastic headlights
that are lighter and less susceptible to stone break-
age than glass headlights.
This plastic is not as scratch resistant as glass and
therefore a different lens cleaning procedures must
be followed.
To minimize the possibility of scratching the lenses
and reducing light output, avoid wiping with a dry
cloth. To remove road dirt, wash with a mild soap
solution followed by rinsing with water.
Do not use abrasive cleaning components, solvents,
steel wool or other aggressive material to clean the
lenses.
SPECIFICATIONS
EXTERIOR LAMP BULBS
LAMP BULB
Back-up.............................P21W
CHMSL (Non-Solar Tint)................P21W
CHMSL (Solar Tint)....................R10WLAMP BULB
Fog Lamp..............................H3
Headlamp..............................H4
License Plate..........................C5W
Front Turn Signal....................PY21W
Citylight..............................T4W
Front Side Repeater.....................T4W
Tail, Stop...........................P21/5W
Rear Turn Signal......................P21W
Rear Fog Lamp........................P21W
INTERIOR LAMP BULBS
LAMP BULB
ABS ................................PC194
AirBag .............................PC194
Alarm Set (Security/Immobilzer)..........PC194
Brake Warning.......................PC194
Center/Rear Reading Lamps...............578
Center/Rear Dome Lamps.................579
Cruise Indicator.......................PC194
Door Ajar Indicator....................PC194
Engine Compartment Lamps...............579
Engine Temp Indicator.................PC194
Front Door Courtesy......................567
Glove Box Lamp.........................194
Glow Plug Indicator (Diesel Engine Only) . . . PC194
High Beam Indicator...................PC194
Instrument Cluster....................PC194
IP/Ash Tray (Left Hand Drive Only).........161
Liftgate Flood Lamps.....................567
Liftgate Ajar Indicator...................PC74
Low Coolant Level (Diesel Engine Only).....PC74
Low Fuel Indicator....................PC194
Low Volts Warning.....................PC74
Low Washer Fluid......................PC74
Oil Pressure Indicator..................PC194
O/H Console Reading Lamps...............579
Seat Belt Indicator (Except Diesel).........PC74
Service Engine Soon...................PC194
Turn Signal..........................PC194
Visor Vanity Lamp...................6501966
NS/GSLAMPS 8L - 17
CHIME WARNING/REMINDER SYSTEM
CONTENTS
page page
GENERAL INFORMATION
INTRODUCTION......................... 1
DIAGNOSIS AND TESTING
CHIME SYSTEM DIAGNOSIS............... 1
DOME LAMP ON CHIME.................. 2
ENGINE TEMPERATURE CRITICAL CHIME.... 2
EXTERIOR LAMPS ON CHIME.............. 2KEY-IN IGNITION CHIME.................. 2
LOW OIL PRESSURE CHIME OPERATION..... 2
SEAT BELT CHIME....................... 2
SEAT BELT LAMP........................ 2
TURN SIGNAL ON CHIME................. 3
WARNING LAMP ANNOUNCEMENT CHIME . . . 3
GENERAL INFORMATION
INTRODUCTION
WARNING: ON VEHICLES EQUIPPED WITH AN
AIRBAG, REFER TO GROUP 8M, RESTRAINT SYS-
TEMS FOR SAFETY PRECAUTIONS AND WARN-
INGS TO OBSERVE WHEN SERVICING AIRBAG
RELATED COMPONENTS.
The chime system provides the driver with warn-
ing chimes for:
²Seat Belt
²Exterior Lamps ON
²Key-In Ignition
²Engine Temperature Critical
²Turn Signals ON
²Dome Lamp ON
²Low Oil Pressure
²High Speed Warning
²Warning Lamp Announcement
The Chime Warning/Reminder System is diagnosed
using a scan tool (DRB). Refer to the proper Body
Diagnostic Procedures manual for testing procedures
and scan tool usage instructions.
DIAGNOSIS AND TESTING
CHIME SYSTEM DIAGNOSIS
NO TONE WHEN IGNITION SWITCH IS
TURNED ON AND DRIVER'S SEAT BELT IS
NOT BUCKLED.
(1) Using a scan tool (DRB), check for tone in any
other function.
(2) Using a voltmeter, check for voltage:
(a) Pin 9 of the internal 32 way connector of the
BCM for battery feed.(b) Pin 8 of the internal 32 way connector of the
BCM for ignition feed.
(c) If voltage OK, go to step Step 3
(d) If NO voltage repair as necessary. Refer to
Group 8W, Wiring Diagrams for component loca-
tions and circuit information.
(3) Check driver's seat belt buckle switch input for
a closed circuit when not buckled. If input not seen,
look for open in wiring or switch. The switch is
grounded when belt is not buckled.
(4) Repair as necessary.
NO FASTEN SEAT BELT LAMP WHEN
IGNITION SWITCH IS TURNED ON.
(1) Check for burned out lamp.
(2) Using a voltmeter check for voltage:
(a) Pin 2 of the mechanical instrument cluster
for battery feed.
(b) Pin 11 of the mechanical instrument cluster
for ignition voltage.
(3) Repair as necessary.
FASTEN SEAT BELT LAMP OR TONE
CONTINUES FOR MORE THAN 10 SECONDS
AFTER SEAT BELTS ARE FASTENED AND
DRIVER'S DOOR IS CLOSED.
(1) Check left door ajar switch for no ground when
switch is depressed.
(a) If continuity replace door ajar switch.
(b) If NO continuity replace BCM for tone condi-
tion, or replace mechanical instrument panel for
lamp condition.
(c) Replace BCM for tone condition.
(d) Replace mechanical instrument cluster for
lamp condition.
NO TONE WHEN PARK OR HEADLAMPS ARE
ON AND DRIVER'S DOOR IS OPEN.
(1) Check left door ajar switch for good ground
when driver's door is open. Repair as necessary.
NSCHIME WARNING/REMINDER SYSTEM 8U - 1