3.3L And 3.5L Electronic Ignition System-System Operation - DaimlerChrysler LH New Yorker 1994 Electronic Service Manual

3.3L AND 3.5L ELECTRONIC IGNITION
SYSTEM-SYSTEM OPERATION
3.3L AND 3.5L ELECTRONIC IGNITION
SYSTEMS-DIAGNOSTIC PROCEDURES

3.3L AND 3.5L ELECTRONIC IGNITION SYSTEM-SYSTEM OPERATION

Automatic Shut Down and Fuel Pump Relays
Camshaft Position Sensor
Crankshaft Position Sensor
Engine Coolant Temperature Sensor . . . . . . . . . . . . 7
General Information . . . . . . . . . . . . . . . . . . . . . . . . 1
Ignition Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Intake Air Temperature Sensor
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 mainte-
nance 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
page
. . . . . . . . . . 1
. . . . 9
page
. . . . . 8
. . . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . 6
3.3L AND 3.5L ELECTRONIC IGNITION
SYSTEMS-SERVICE PROCEDURES
IGNITION SWITCH AND INTERLOCK
SPECIFICATIONS
INDEX
Knock Sensors-3.5L Engine
Manifold Absolute Pressure Sensor
Powertrain Control Module (PCM)
Spark Plug Cables . . . . . . . . . . . . . . . . . . . . . . . . . 2
Spark Plug Condition
Spark Plug Service
Spark Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FIRING ORDER
The firing order of the 3.3L and 3.5L direct ignition
system is 1-2-3-4-5-6 (Fig. 1).
Fig. 1 Spark Plug Wire Routing-
3.3L and 3.5L Engine
IGNITION SYSTEMS
. . . . . . 10
. . . . . . . . 16
. . . . . . . . . . . . . . . . . . . . . . . 22
. . . . . . . . . . . . . . . . . 7
. . . . . . . . . . . . 8
. . . . . . . . . . . . . 2
. . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . 2
8D - 1
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