Chrysler Stratus Convertible. Manual — part 238
sensor signals when the ignition switch is in the Run
position, it will de-energize the ASD relay.
ELECTRONIC IGNITION COIL
DESCRIPTION
The coil pack consists of 2 coils molded together.
The coil pack is mounted on the valve cover (Fig. 3).
High tension leads route to each cylinder from the
coil.
OPERATION
WARNING: THE DIRECT IGNITION SYSTEM GEN-
ERATES
APPROXIMATELY
40,000
VOLTS.
PER-
SONAL INJURY COULD RESULT FROM CONTACT
WITH THIS SYSTEM.
The coil fires two spark plugs every power stroke.
One plug is the cylinder under compression, the
other cylinder fires on the exhaust stroke. Coil num-
ber one fires cylinders 1 and 4. Coil number two fires
cylinders 2 and 3. The PCM determines which of the
coils to charge and fire at the correct time.
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) Relay—PCM Output, in this section for
relay operation.
CAMSHAFT POSITION SENSOR—2.0L
DESCRIPTION
The camshaft position sensor attaches to the rear
of the cylinder head (Fig. 5). A target magnet
attaches to the rear of the camshaft and indexes to
the correct position. The sensor also acts as a thrust
plate to control camshaft endplay.
OPERATION
The PCM determines fuel injection synchronization
and cylinder identification from inputs provided by
the camshaft position sensor (Fig. 4) and crankshaft
position sensor. From the two inputs, the PCM deter-
mines 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. 6). The sensor input
switches from high (5 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 under-
neath.
KNOCK SENSOR
DESCRIPTION
The knock sensor threads into the cylinder block.
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 cyl-
inders 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.
Fig. 3 Ignition Coil Pack—2.0L Engine
1 – IGNITION COILS
Fig. 4 Camshaft Position Sensor—2.0L DOHC
1 – CAMSHAFT POSITION SENSOR
JX
IGNITION SYSTEM
8D - 3
DESCRIPTION AND OPERATION (Continued)
NOTE: Over or under tightening affects knock sen-
sor performance, possibly causing improper spark
control.
LOCK KEY CYLINDER
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. 7) :
• Accessory
• Off (lock)
• Unlock
• On/Run
• Start
IGNITION INTERLOCK
OPERATION
All vehicles equipped with automatic transaxles
have an interlock system. The system prevents shift-
ing the vehicle out of Park unless the ignition lock
cylinder is in the Off, Run or Start position. In addi-
tion, 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 - Tran-
saxle for Automatic Transmission Shifter/Ignition
Interlock.
REMOVAL AND INSTALLATION
SPARK PLUG CABLES – 2.0L
Clean high tension cables with a cloth moistened
with a non- flammable solvent. Wipe the cables dry.
Check for brittle or cracked insulation.
Resistance cables are identified by the words Elec-
tronic Suppression.
REMOVAL
Disconnect the cable from the ignition coil first.
The cables insulate the spark plugs and cover the
top of the spark plug tubes (Fig. 3). To remove the
cables, lightly grasp the top of the cable. Rotate the
insulator 90° and pull straight up. Ensure the #1
and #4 cables run under the #2 and #3 ignition
Fig. 5 Target Magnet—Typical
1 – CAM MAGNET/TARGET
2 – CAMSHAFT POSITION SENSOR
Fig. 6 Target Magnet Polarity
1 – TARGET MAGNET
Fig. 7 Ignition Lock Cylinder Detents
8D - 4
IGNITION SYSTEM
JX
DESCRIPTION AND OPERATION (Continued)
coil towers. Keep #4 cable away from the oil fill
cap.
INSTALLATION
Ensure the #1 and #4 cables run under the #2
and #3 ignition coil towers. Keep #4 cable away
from the oil fill cap.
Rotate the insulator 90° and push straight down.
Connect the cable to the ignition coil.
SPARK PLUGS – 2.0L
Failure to route the cables properly could cause the
radio to reproduce ignition noise, cross ignition of the
spark plugs or short circuit the cables to ground.
NOTE: REMOVE
cables
from
coil
first
before
removing spark plug insulator.
REMOVAL
Always remove the spark plug cable by grasping
the top of the spark plug insulator, turning the boot
1/2 turn and pulling straight up in a steady motion.
(1) Remove the spark plug using a quality socket
with a rubber or foam insert.
(2) 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 insulators over spark plugs.
Ensure the top of the spark plug insulator covers the
upper end of the spark plug tube.
(4) Install spark plug cable to coil.
IGNITION COIL – 2.0L
The electronic ignition coil pack attaches directly
to the valve cover (Fig. 8).
REMOVAL
(1) Disconnect electrical connector from coil pack.
(2) Remove coil pack mounting nuts.
(3) Remove coil pack.
INSTALLATION
(1) Install coil pack on valve cover.
(2) Transfer spark plug cables to new coil pack.
The coil pack towers are numbered with the cylinder
identification. Be sure the ignition cables snap onto
the towers.
AUTOMATIC SHUTDOWN RELAY
The relay is located in the Power Distribution Cen-
ter (PDC) (Fig. 9). The PDC is located in the engine
compartment. For the location of the relay within the
PDC, refer to the PDC cover for location. Check elec-
trical terminals for corrosion and repair as necessary.
CAMSHAFT POSITION SENSOR—DOHC
The camshaft position sensor is mounted to the
rear of the cylinder head (Fig. 10).
Fig. 8 Electronic Ignition Coil Pack—2.0L
1 – IGNITION COIL FASTENERS
2 – ELECTRICAL CONNECTOR
Fig. 9 Power Distribution Center (PDC)
1 – BATTERY POSITIVE
2 – BATTERY GROUND
3 – AIR CLEANER
4 – PCM
5 – PDC
6 – TCM
JX
IGNITION SYSTEM
8D - 5
REMOVAL AND INSTALLATION (Continued)
REMOVAL
(1) Remove filtered air tube from the throttle body
and air cleaner housing.
(2) Disconnect electrical connector from camshaft
position sensor.
(3) Remove camshaft position sensor mounting
screws. Remove sensor.
(4) Loosen screw attaching target magnet to rear
of camshaft (Fig. 11).
INSTALLATION
The target magnet has locating dowels that fit into
machined locating holes in the end of the camshaft
(Fig. 12).
(1) Install target magnet in end of camshaft.
Tighten mounting screw to 3 N·m (30 in. lbs.) torque.
(2) Install camshaft position sensor. Tighten sensor
mounting screws to 9 N·m (80 in. lbs.) torque.
(3) Carefully attach electrical connector to cam-
shaft position sensor. Installation at an angle may
damage the sensor pins.
(4) Install filtered air tube. Tighten clamps to 3
N·m
61 (25 in. lbs. 65) torque.
CRANKSHAFT POSITION SENSOR – 2.0 L
The crankshaft position sensor mounts to the
engine block behind the generator, just above the oil
filter (Fig. 13).
REMOVAL
(1) Disconnect electrical connector from crankshaft
position sensor.
(2) Remove sensor mounting screw. Remove sensor.
INSTALLATION
(1) Reverse procedure for installation.
IGNITION SWITCH
The ignition switch attaches to the lock cylinder
housing on the end opposite the lock cylinder (Fig.
14). For ignition switch terminal and circuit identifi-
cation, refer to Group 8W, Wiring Diagrams.
REMOVAL
(1) Disconnect
negative
cable
from
auxillary
jumper terminal on driver’s side strut tower.
(2) Remove fuse panel cover from left end of
instrument panel. Remove screw holding end of
instrument panel top cover (Fig. 15).
(3) Pull center bezel off (Fig. 16).
(4) Remove screws holding instrument panel top
cover to center of instrument panel (Fig. 17).
Fig. 10 Camshaft Position Sensor Location—DOHC
1 – CAMSHAFT POSITION SENSOR
Fig. 11 Target Magnet Removal/Installation
1 – TARGET MAGNET
2 – MOUNTING BOLT
Fig. 12 Target Magnet Installation
1 – LOCATING DOWELS
2 – LOCATING HOLES (2)
8D - 6
IGNITION SYSTEM
JX
REMOVAL AND INSTALLATION (Continued)
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