FUEL GAUGE
The diagnosis found here addresses an inoperative
gauge condition. If the problem being diagnosed is
related to gauge accuracy, be certain to confirm that
the problem is with the gauge or sending unit and
not with the fuel tank. Inspect the fuel tank for signs
of damage or distortion that could affect the sending
unit performance before you proceed with gauge
BR 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 connector
is located on top of the fuel tank. The gauge
needle should move to the low end of the gauge scale.
If 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 continuity.
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 connector.
(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 sensor
signal circuit cavities of the right cluster connector
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.
.
