Dodge RAM TRUCK 1500 1995 Service Manual page 382

IGNITION SYSTEMS 8D - 1
D I A G H O S T 1 C S / S E R V S C E PROCEDURES
INDEX
page page
Automatic Shutdown (ASD) Relay Test . . . . . . . . . . 9
Camshaft Position Sensor Test—3.9L V-6 or
5.2/5.9L V-8 Engines 9
Camshaft Position Sensor Test—8.0L V-10 Engine . 10
Crankshaft Position Sensor Test—3.9L V-6 or
5.2/5.9L V-8 Engines 10
Crankshaft Position Sensor Test—8.0L V-10
Engine 11
Distributor Cap—3.9L V-6 or 5.2/5.9L V-8 Engines . 11
Distributor Rotor—3.9L V-6 or 5.2/5.9L V-8
Engines . 12
DRB Scan Tool 12
Engine Coolant Temperature Sensor Test . 14
General Information . . . . . . . . . . . . . . . . . . . . . . . . 9
Ignition Coil Pack Tests—8.0L V-10 Engine 12
Ignition Coil Test—3.9L V-6 or 5.2/5.9L V-8
Engines 12
Ignition Control Module Test—8.0L V-10 Engine . . . 13
Ignition Secondary Circuit Diagnosis . . . . . . . . . . . 15
Ignition Timing . 16
Intake Manifold Air Temperature Sensor Test . . . . . 16
Manifold Absolute Pressure (MAP) Sensor Test . . . 16
On-Board Diagnostics 20
Oxygen Sensor (02S) Tests 20
Powertrain Control Module (PCM) 16
Spark Plug Secondary Cables 19
Spark Plugs 17
GENERAL INFORMATION
This section of the group, Diagnostics/Service Pro­
cedures, will discuss basic ignition system diagnostics
and service adjustments.
For system operation and component identification,
refer to the Component Identification/System Opera­
tion section of this group.
For removal or installation of ignition system com­
ponents, refer to the Component Removal/Installa­
tion section of this group.
For other useful information, refer to On-Board Di­
agnostics in the General Diagnosis sections of Group
14, Fuel System in this manual.
For operation of the DRB Scan Tool, refer to the
appropriate Powertrain Diagnostic Procedures ser­
vice manual.
AUTOMATIC SHUTDOWN (ASD) RELAY TEST
To perform a complete test of this relay and its cir­
cuitry, refer to the DRB scan tool. Also refer to the
appropriate Powertrain Diagnostics Procedures man­
ual. To test the relay only, refer to Relays—Opera­
tion/Testing in the Group 14, Fuel System section of
this service manual.
CAMSHAFT POSITION SENSOR TEST—3.9L V-6
OR 5.2/5.9L V-8 ENGINES
The camshaft position sensor (Fig. 1) is located in
the distributor on all 3.9L V-6 or 5.2L/5.9L V-8 en­
gines.
To perform a complete test of this sensor and its
circuitry, refer to the DRB scan tool. Also refer to the
appropriate Powertrain Diagnostics Procedures man­
ual. To test the sensor only, refer to the following:
For this test, an analog (non-digital) voltme­
ter is needed. Do not remove the distributor connec­
tor from the distributor. Using small paper clips,
CAMSHAFT
POSITION
SENSOR
SYNC
SIGNAL
GENERATOR
DISTRIBUTOR
ASSEMBLY
J9314-82
Fig. 1 Camshaft Position Sensor—3.9L V-6 or
5.2/5.9L V-8 Engines—Typical
insert them into the backside of the distributor wire
harness connector to make contact with the termi­
nals. Be sure that the connector is not damaged
when inserting the paper clips. Attach voltmeter
leads to these paper clips.
(1) Connect the positive (+) voltmeter lead into the
sensor output wire. This is at done the distributor
wire harness connector. For wire identification, refer
to Group 8W, Wiring Diagrams.
(2) Connect the negative (-) voltmeter lead into the
ground wire. For wire identification, refer to Group
8W, Wiring Diagrams.
(3) Set the voltmeter to the 15 Volt DC scale.
(4) Remove distributor cap from distributor (two
screws). Rotate (crank) the engine until the distribu­
tor rotor is pointed towards the rear of vehicle. The
movable pulse ring should now be within the sensor
pickup.