Chrysler Concorde 1993 Service Manual page 259

3.3L AND 3.5L ELECTRONIC IGNITION
SYSTEM—SYSTEM OPERATION . . . . . . . . . . 1
3.3L AND 3.5L ELECTRONIC IGNITION
SYSTEMS—SERVICE PROCEDURES
3.3L AND 3.5L ELECTRONIC IGNITION SYSTEM—SYSTEM OPERATION
Auto Shutdown and Fuel Pump Relays
Camshaft Position Sensor
Charge Air Temperature Sensor
Crankshaft Position Sensor
Engine Coolant Temperature Sensor
General Information . . . . . . . . . . . . . . . . . . . . . . . . 1
Ignition Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
GENERAL INFORMATION
This section describes the electronic ignition system
for the 3.3L and 3.5L engines used in LH vehicles.
The On-Board Diagnostics Section in Group 14 de-
scribes diagnostic trouble codes.
Group 0, Lubrication and Maintenance, contains
general maintenance information for ignition related
items. The Owner's Manual also contains maintenance
information.
The 3.3L and 3.5L engines use a fixed ignition timing
system. The distributorless electronic ignition system
is refereed to as the Direct Ignition System.
Basic ignition timing is not adjustable. The
powertrain control module (PCM) determines spark
advance. The system's three main components are the
coil pack, crankshaft position sensor, and camshaft
position sensor.
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 the inputs to the PCM. The PCM
determines crankshaft position from these sensors.
The PCM calculates injector sequence and ignition
timing from crankshaft position. For a description of
both sensors, refer to Camshaft Position Sensor and
Crankshaft Position Sensor in this section.
IGNITION SYSTEMS
CONTENTS
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3.3L ELECTRONIC IGNITION SYSTEM—
DIAGNOSTIC PROCEDURES
IGNITION SWITCH AND INTERLOCK
SPECIFICATIONS
INDEX
Knock Sensors—3.5L Engine
Manifold Absolute Pressure Sensor
Powertrain Control Module (PCM)
Spark Plug Cables
Spark Plug Condition
Spark Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FIRING ORDER
The firing order of the 3.3L and 3.5L direct igni-
tion system is 1-2-3-4-5-6 (Fig. 1).
Fig. 1 Spark Plug Wire Routing—3.3L and 3.5L
IGNITION SYSTEMS
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Engine
8D - 1
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