Dodge RAM TRUCK 1500 1995 Service Manual page 383

8D-10 IGNITION SYSTEMS
B R
(5) Turn ignition key to ON position. Voltmeter
should read approximately 5.0 volts.
(6) If voltage is not present, check the voltmeter
leads for a good connection.
(7) If voltage is still not present, check for voltage
at the supply wire. For wire identification, refer to
Group 8W, Wiring Diagrams.
(8) If voltage is not present at supply wire, check
for voltage at pin-7 of powertrain control module
(PCM) 60-way connector. Leave the PCM connector
connected for this test.
(9) If voltage is still not present, perform vehicle
test using the DRB scan tool.
(10) If voltage is present at pin-7, but not at the
supply wire;
(a) Check continuity between the supply wire.
This is checked between the distributor connector
and pin-7 at the PCM. If continuity is not present,
repair the harness as necessary.
(b) Check for continuity between the camshaft
position sensor output wire and pin-44 at the PCM.
If continuity is not present, repair the harness as
necessary.
(c) Check for continuity between the ground cir­
cuit wire at the distributor connector and ground.
If continuity is not present, repair the harness as
necessary.
(11) While observing the voltmeter, crank the en­
gine with ignition switch. The voltmeter needle
should fluctuate between 0 and 5 volts while the en­
gine is cranking. This verifies that the camshaft po­
sition sensor in the distributor is operating properly
and a sync pulse signal is being generated.
If sync pulse signal is not present, replacement of
the camshaft position sensor is necessary.
For removal or installation of ignition system com­
ponents, refer to the Component Removal/Installa­
tion section of this group.
For system operation and component identification,
refer to the Component Identification/System Opera­
tion section of this group.
CAMSHAFT POSITION SENSOR TEST—8.01 V-10
ENGINE
The camshaft position sensor is located in the tim­
ing chain case/cover on the left-front side of the en­
gine (Fig. 2).
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:
(1) Disconnect the sensor pigtail harness from the
main engine wiring harness connector.
(2) Place an ohmmeter across terminals B and C
(Fig. 3). Ohmmeter should be set to lK-to-lOK
CAMSHAFT \
Fig. 2 Camshaft Position Sensor—8.0L V-10
Engine—Typical
scale for this test. The meter reading should be
open (no resistance). Replace sensor if a low resis­
tance is indicated.
VIEW LOOKING INTO
CONNECTOR ON SENSOR
PIGTAIL HARNESS J948D-20
Fig. 3 Typical Sensor Connector
CRANKSHAFT POSITION SENSOR TEST—3.9L V-6
OR 5.2/5.9L V-8 ENGINES
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:
The sensor is located on the top of cylinder block
near the rear of right cylinder head (Fig. 4).
(1) Near the rear of intake manifold, disconnect
sensor pigtail harness connector from main wiring
harness.
(2) Place an ohmmeter across terminals B and C
(Fig. 3). Ohmmeter should be set to lK-to-lOK
scale for this test. The meter reading should be
open (no resistance). Replace sensor if a low resis­
tance is indicated.