190-01717-B1 G500/G600 TXi Part 23 AML STC Maintenance ManualRev. 1 Page 4-34Figure 4-25 EIS Gauge TroubleshootingEIS GaugesIf fault still exists,contact Garmin.UnstableRPMResistor failureORPoor connectionORInterferenceStarting vibrator isinstalled. Normaloperation with P-Lead RPM input.CauseDisconnect P-Leadsignal wires atboth ends. Verifywire is more than400KOhms.Replace wire andparallel resistors ifless than400KOhms.Verify wiring andconnectionsRoute signal wiresaway from sparkplug leads andpower wiresDisconnect P-Leadsignal wire at bothends of suspect mag.Verify wire is morethan 400 KOhms.Replace wire andparallel resistors if lessthan 400KOhms.Verify wiring andconnectionsCorrectiveActionLoss of RPMduring mag.checkCauseResistor failureORPoor connectionCorrectiveActionRPM iserratic duringengine start/crankingReplace fuel probeFuel quantitygaugeinaccurateCorrectiveActionPoor connectionORAir/contamination in thesensorORIncorrect sensor config.ORInterferenceFuel flowindicationunstableCauseCorrectiveActionFuel flow requirescalibrationCalibrate fuel flow.Limited to 15% inGDU NormalMode. Moreadjustment willrequire a differentK-Factor.Fuel totalizerinaccurateCauseCorrectiveActionVerify wiring andconnectionsPurge fuel lines ofair, verify sensororientation, cleanthe sensor.Configure sensor with‘Hi’ filtering optionCausePoor connectionORFuel probemalfunctionORProbe out ofcalibrationCauseVerify wiring andconnectionsNoneCorrectiveActionRoute wires awayfrom spark plug leadsand power wires,install EMI shieldReplace fuel flowtransducerReplace fuel flowtransducerRecalibrate fueltank probesPressure line drainplugged/line blockedORSensor failureVerify manifoldpressure line vent(if installed) isclear.Verify fuel is nottrapped in themanifold pressureline.ManifoldpressureunstableCauseCorrectiveActionReplace manifoldpressure sensorPressure lineblockedORSensor out of cal.ORSensor failureVerify manifoldpressure line isclear.ManifoldpressureinaccurateCauseCorrectiveActionRecalibratemanifold pressuresensor (brasssensor only)Replace manifoldpressure sensor
