Mechanics

FUEL GAUGE

2005 Jeep Liberty

Electrical problem
2005 Jeep Liberty 6 cyl Two Wheel Drive Automatic 46000 miles

Fuel gauge just went to empty even though the tank is full. What happened?
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Cfpstrick
March 19, 2010.




Put the instrument cluster into its self-diagnostic mode. In this mode the instrument cluster can perform a self-diagnostic test that will confirm that the instrument cluster circuitry, the gauges, the PCI data bus message controlled indicators, and the chime tone transducer are capable of operating as designed.

Begin the test with the ignition switch in the Off position.
Depress the odometer/trip odometer switch button.
While still holding the odometer/trip odometer switch button depressed, turn the ignition switch to the On position, but do not start the engine.
Release the odometer/trip odometer switch button.
The instrument cluster will automatically begin the actuator test sequence, as follows: The cluster will turn on, then off again each of the PCI data bus message controlled indicators to confirm the functionality of the indicator and the cluster control circuitry: The cluster will sweep the needles for each of the gauges to several calibration points in sequence to confirm the functionality of the gauge and the cluster control circuitry: The cluster will sequentially step the odometer/trip odometer VFD unit display from all ones (111111) through all nines (999999) to confirm the functionality of all VFD unit segments and their control circuitry, then display the software version number.
The cluster will generate five (5) chime tones to confirm the functionality of the audible tone transducer and the control circuitry.
The actuator test is now completed. The instrument cluster will automatically exit the self-diagnostic mode and return to normal operation at the completion of the test, if the ignition switch is turned to the Off position during the test, or if an engine RPM message indicating that the engine is running is received from the PCM over the PCI data bus during the test.

BMRFIXIT
Mar 20, 2010.


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