Dodge ram truck 3500 1996 Service Manual page 395

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IGNITION SYSTEM 80 - 13
DIAGNOSIS AND TESTING fContinued!
nasties Procedures service manual. 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,
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.
(5) Turn ignition key to ON position. Voltmeter
should read approximately 5.0 volts. •
(6) I f voltage is not present, check the voltmeter
leads for a good connection.
(7) I f voltage is still not present,. check for voltage
at the supply wire. For wire identification, refer to
Group 8W, Wiring Diagrams.
(8) I f 5 volts is not present at supply wire, check
for voltage at PCM 32-way connector (cavity A-17).
Refer to Group 8W, Wiring for location of connector/
terminal. Leave the PCM connector connected for
this test.
(9) I f voltage is still not present, perform vehicle
test using the DRB scan tool.
(10) I f voltage is present at cavity A-17, but not at
the supply wire:
(a) . Check continuity between the supply wire.
This is checked between the distributor connector
and cavity A-17 at the PCM. I f continuity Is not
present, repair the harness as necessary.
(b) Check for continuity between the camshaft
position sensor output wire and cavity A-18 at the
PCM. I f continuity is not present, repair the har­
ness 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
engine with Ignition switch. The voltmeter needle
should fluctuate between 0 and 5 volts while the
engine is cranking. This verifies that the camshaft
position sensor in the distributor is operating prop­
erly and a sync pulse signal is being generated.
If sync pulse signal is not present, replacement of
the camshaft position sensor is necessary
CAMSHAFT POSITION SENSOR TEST—8.0L V-10
ENGINE
The camshaft position sensor is located in the tim­
ing chain case/cover on the left-front side of the
engine (Fig. 29).
Fig. 29 Camshaft Position Sensor—8.0L V-10 Engine
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 connector at sensor.
(2) Place an ohmmeter across terminals B and C
(Fig. 30). Ohmmeter should be set to lK-to-lOK
scale for this test. The meter reading should be
open (no resistance). Replace sensor i f a low resis­
tance is indicated.
B+ GROUND OUTPUT
Fig. 30 Sensor Connector—8.0L Engine