Diagnosis And Testing - Dodge ram truck 3500 1996 Service Manual

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INSTRUMENT PANEL SYSTEMS 8E - 9
DIAGNOSIS AND TESTING (Continued)
diagnosis. Refer to Group 14 - Fuel System for more
information. For circuit descriptions and diagrams,
refer to 8W-40 - Instrument Cluster in Group 8W -
Wiring Diagrams.
(1) Turn the Ignition switch to the On position.
Disconnect the fuel pump module connector. The con­
nector is located on top of the fuel tank. The gauge
needle should move to the low end of the gauge scale.
I f OK, go to Step 2. I f not OK, go to Step 4.
(2) Connect a jumper wire between the sending
unit ground circuit cavity and the fuel level sensor
signal circuit cavity of the fuel pump module wiring
connector. The gauge needle should move to the high
end of the gauge scale. I f OK, refer to Group 14 -
Fuel System for the procedures to replace the faulty
sending unit. I f not OK, remove the jumper wire and
go to Step 3.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Check for continuity between the sending unit
ground circuit cavity of the fuel pump module wiring
connector and a good ground. There should be conti­
nuity. I f OK, go to Step 4. I f not OK, repair the open
circuit to ground as required.
(4) Remove the instrument cluster bezel and the
cluster assembly. Disconnect the right cluster connec­
tor.
(5) Probe the fuel level sensor signal circuit cavity
of the right cluster connector. Check for continuity to
a good ground. There should be no continuity. I f OK,
go to Step 6. I f not OK, repair the short circuit as
required.
(6) Check for continuity between the fuel level sen­
sor signal circuit cavities of the right cluster connec­
tor and the. fuel pump module connector. There
should be continuity. I f OK, replace the faulty gauge.
If not OK, repair the open circuit as required.
OIL PRESSURE OAUIE
The diagnosis found here addresses an inoperative
gauge condition. I f the problem being diagnosed is
related to gauge accuracy, be certain to confirm that
the problem is with the gauge and not with the
engine oiling system performance. The actual engine
oil pressure should be checked with a test gauge and
compared to the Instrument cluster gauge readings
before you proceed with gauge diagnosis. Refer to
Group 9 - Engines for more information. For circuit
descriptions and diagrams, refer to 8W-40 - Instru­
ment Cluster in Group 8W - Wiring Diagrams.
(1) Turn the ignition switch to the On position.
Disconnect the oil pressure sending unit connector
(Fig. 4), (Fig. 5) or (Fig. 6). The gauge needle should
move to the low end of the gauge scale. I f OK, go to
Step 2. I f not OK, go to Step 3.
EGR VALVE
OIL PRESSURE -
SENDING UNIT
J938E-35
Fig. 4 Oil Pressure Switch/Sending Unit - V-6/V-8
Engine
Fig. 5 Oil Pressure Switch/Sending Unit •
Engine
J948E-38
V-10
(2) Install a jumper wire from the oil pressure sen­
sor signal circuit cavity of the sending unit connector
to a good ground. The gauge needle should move to
the high end of the gauge scale. I f OK, replace the
faulty sending unit. I f not OK, remove the jumper
wire and go to Step 3.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the instrument cluster bezel and the cluster
assembly. Disconnect the right instrument cluster
connector.
(4) Probe the oil pressure sensor signal circuit cav­
ity of the right cluster connector and check for conti-