Dodge ram truck 3500 1996 Service Manual page 384

8D - 2 IGNITION SYSTEM
POWERTRAIN CONTROL MODULE (PCM) . . . 27
SPARK PLUG CABLES 17
SPARK PLUGS 18
THROTTLE POSITION SENSOR 25
SPECIFICATIONS
ENGINE FIRING O R D E R — 3 . 9 L V-6 ENGINE . . 30
ENGINE FIRING ORDER—5.2L/5.9L V-8
ENGINES 30
IGNITION COIL RESISTANCE—3.9L/5.2L/5.9L
ENGINES 32
G E N E R A L I N F O R M A T I O N
INTRODUCTION
This group describes the ignition systems for 3.9L
V-6, 5.2L/5.9L V-8, and 8.0L V-10 engines.
The 3.9L V-6 and 5.2L V-8 engines will be referred
to in this Ignition Group as: Light Duty Cycle (LDC)
engines. The 5.9L V-8 gas powered engine will be
referred to as either: Light Duty Cycle (LDC) or
Heavy Duty Cycle (HDC) engines. The 8.0L V-10
engine will be referred to as either: Light Duty Cycle
(LDC) or Heavy Duty Cycle (HDC) engines.
Either of the HDC gas powered engines can be eas­
ily identified by the use of an engine mounted air
injection pump. The 3.9L V-6 engine, the 5.2/5.9L V-8
LDC or the 8.0L V-10 LDC gas engines will not use
an air injection pump.
On Board Diagnostics is described in Group 25,
Emission Control Systems.
Group 0, Lubrication and Maintenance, contains
general maintenance information (in time or mileage
intervals) for ignition related items. The Owner's
Manual also contains maintenance information.
D E S C R I P T I O N MMB O P E R A T I O N
IGNITION SYSTEM—V-6/V-8 ENGINES
The ignition systems used on the 3.9L V-6, the 5.2L
V-8 and the 5.9L V-8 are basically identical. Similar­
ities and differences between the systems will be dis­
cussed.
The ignition system is controlled by the powertrain
control module (PCM) on all engines.
The ignition system consists of:
• Spark Plugs
• Ignition Coil
• Secondary Ignition Cables
• Distributor (contains rotor and camshaft position
sensor)
• Powertrain Control Module (PCM)
• Also to be considered part of the ignition system
are certain inputs from the Crankshaft Position,
IGNITION COIL RESISTANCE—8.0L V-10
ENGINE 32
IGNITION TIMING 30
SPARK PLUG CABLE O R D E R — 8 . 0 L V-10
ENGINE 31
SPARK PLUG CABLE RESISTANCE 32
SPARK PLUGS 31
TORQUE SPECIFICATIONS 31
VECI LABEL SPECIFICATIONS 30
Camshaft Position, Throttle Position and MAP Sen­
sors
IGNITION SYSTEM—8.0L V-10 ENGINE
The ignition system used on the 8.0L V-10 engine
will not use a conventional mechanical distributor. I t
will be referred to as a distributor-less ignition sys­
tem. The ignition coils are individually fired, but
each coil is a dual output. Refer to Ignition Coil Pack
for additional information.
The ignition system is controlled by the powertrain
control module (PCM) on all engines.
The ignition system consists of:
• Spark Plugs
• Ignition Coil Packs containing individual coils
• Secondary Ignition Cables
• Powertrain Control Module (PCM)
• Also to be considered part of the ignition system
are certain inputs from the Crankshaft Position,
Camshaft Position, Throttle Position and MAP Sen­
sors
POWERTRAIN CONTROL MODULE
The Powertrain Control Module (PCM) is located
in the engine compartment (Fig. 1).
Fig. 1 Powertrain Control Module (PCM)
The ignition system is controlled by the PCM.