Chrysler RAM TRUCK 2500 1994 Service Manual page 367

8D - 10 IGNITION SYSTEMS
D1AGNOST1CS/SERW1CE PROCEDURES
INDEX
page
Automatic Shut Down (ASD) Relay Test . . 10
Camshaft Position Sensor Test—3.9L V-6 or
5.2/5.9L V-8 Engines 10
Camshaft Position Sensor Test—8.0L V-10 Engine . 11
Crankshaft Position Sensor Test—3.9L V-6 or
5.2/5.9LV-8 Engines 11
Crankshaft Position Sensor Test—8.0L V-10
Engine 12
Distributor Cap—3.9L V-6 or 5.2/5.9L V-8 Engines . 12
Distributor Rotor—3.9L V-6 or 5.2/5.9L V-8
Engines 13
DRB Scan Tool 13
Engine Coolant Temperature Sensor Test 15
General Information 10
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 i n 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 SHUT DOWN (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—Operation/Testing i n the Group 14, Fuel Sys­
tem section of this service manual.
CAMSHAFT POSITION SENSOR TEST—3 J L ¥-6
OR 5.2/5.9L ¥-8 ENGINES
The camshaft position sensor (Fig. 1) is located i n
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:
F o r this test, an analog (non-digital) voltme­
ter is needed. Do not remove the distributor connec­
tor from the distributor. Using small paper clips,
page
Ignition Coil Pack Tests—8.0L V-10 Engine . . 13
Ignition Coil Test—3.9L V-6 or 5.2/5.9L V-8
Engines 13
Ignition Control Module Test—8.0L V-10 Engine . . . 14
Ignition Secondary Circuit Diagnosis 16
Ignition Timing 18
Intake Manifold Air Temperature Sensor Test . . . . . 18
Manifold Absolute Pressure (MAP) Sensor Test . . . 19
On-Board Diagnostics (OBD) 23
Oxygen Sensor (02S) Tests . . . 23
Powertrain Control Module (PCM) 19
Spark Plug Secondary Cables 22
Spark Plugs 19
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.