Vacuum Fluorescent Display Self-Diagnostic Actuator Test: Notes

NOTE: For additional indicator diagnosis, see SYMPTOM IDENTIFICATION table under SELF-DIAGNOSTIC SYSTEM.

The instrument cluster actuator test will 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 indicator lamps, and the chime tome generator are capable of operating as designed. During the actuator test the instrument cluster circuitry will sound the chime tone generator, position each of the gauge needles at various specified calibration points, illuminate each of the segments in the VFD, and turn all of the PCI data bus message controlled indicators ON and OFF again.

Successful completion of the actuator test will confirm that the instrument cluster is operational. There still may be a problem with the PCI data bus, the PCM, the ACM, the SKIM, or the inputs to one of the modules. If an individual gauge does not respond properly, or does not respond at all during the actuator test, the instrument cluster should be removed. Check that the screws securing the inoperative gauge to the instrument cluster electronic circuit board are properly tightened before considering instrument cluster replacement. If mounting screws check OK, replace the instrument cluster.