IGNITION SYSTEM
CONTENTS
page page
DESCRIPTION AND OPERATION
AUTOMATIC SHUTDOWN RELAY ............ 4
CAMSHAFT POSITION SENSOR—2.0/2.4L .... 6
CAMSHAFT POSITION SENSOR—2.5L ....... 6
CRANKSHAFT POSITION SENSOR—2.0/2.4L . . 4
CRANKSHAFT POSITION SENSOR—2.5L ..... 5
ELECTRONIC IGNITION COIL—2.0/2.4L ...... 3
IGNITION COIL—2.5L .................... 3
IGNITION INTERLOCK .................... 7
IGNITION SYSTEM ....................... 1
KNOCK SENSOR ......................... 7
LOCK KEY CYLINDER ..................... 7
SPARK PLUG CABLES .................... 2
SPARK PLUGS PLATINUM ................. 2
SPARK PLUGS—2.0/2.4L .................. 2
DIAGNOSIS AND TESTING
CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR ........ 10
CHECK COIL TEST—2.0/2.4L ............... 9
CHECK COIL TEST—2.5L .................. 9
DISTRIBUTOR CAP RESISTANCE TEST—2.5L
.. 10
FAILURE TO START TEST—2.0/2.4L ......... 9
FAILURE TO START TEST—2.5L ........... 10
IGNITION TIMING PROCEDURE ............ 10
SPARK PLUG CONDITION ................ 10
TESTING FOR SPARK AT COIL—2.0/2.4L ..... 8
TESTING FOR SPARK AT COIL—2.5L ........ 8
REMOVAL AND INSTALLATION
AUTOMATIC SHUTDOWN RELAY ........... 16
CAMSHAFT POSITION SENSOR—DOHC ..... 17
CAMSHAFT POSITION SENSOR—SOHC ..... 16
CRANKSHAFT POSITION SENSOR—2.0/2.4L
.. 18
CRANKSHAFT POSITION SENSOR—2.5L .... 18
DISTRIBUTOR CAP—2.5L ................ 20
DISTRIBUTOR ROTOR—2.5L.............. 20
DISTRIBUTOR—2.5L .................... 19
IGNITION COIL—2.0/2.4L ................ 15
IGNITION COIL—2.5L ................... 16
IGNITION INTERLOCK ................... 23
IGNITION SWITCH ...................... 20
LOCK CYLINDER HOUSING ............... 23
LOCK KEY CYLINDER .................... 23
SPARK PLUG CABLES—2.0/2.4L ........... 13
SPARK PLUGS AND CABLES—2.5L ........ 13
SPARK PLUG—2.0/2.4L .................. 13
SPECIFICATIONS
FIRING ORDER ......................... 24
IGNITION COILS ........................ 25
SPARK PLUG CABLE RESISTANCE—2.0L .... 24
SPARK PLUG CABLE RESISTANCE—2.4L .... 24
SPARK PLUG CABLE RESISTANCE—2.5L .... 24
SPARK PLUGS ......................... 24
TORQUE SPECIFICATION ................. 24
VECI LABEL ........................... 24
DESCRIPTION AND OPERATION
IGNITION SYSTEM
DESCRIPTION
NOTE: The 2.0, 2.4, and 2.5L engines use a fixed
ignition timing system. Basic ignition timing is not
adjustable. All spark advance is determined by the
Powertrain Control Module (PCM).
The distributorless ignition system used on
2.0/2.4L engines is referred to as the Direct Ignition
System (DIS). Basic ignition timing is not adjust-
able. The system’s three main components are the
coil pack, crankshaft position sensor, and camshaft
position sensor.
The 2.5L engine uses a distributor, crankshaft sen-
sor and ignition coil. Basic ignition timing is not
adjustable. The system’s main components are the
distributor, distributor pickup, camshaft signal,
crankshaft signal and ignition coil.
OPERATION
The crankshaft position sensor and camshaft posi-
tion sensor are hall effect devices. The camshaft posi-
tion sensor and crankshaft position sensor generate
pulses that are inputs to the PCM. The PCM deter-
mines crankshaft position from these sensors. The
PCM calculates injector sequence and ignition timing
from crankshaft position. For a description of both
JA IGNITION SYSTEM 8D - 1
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