TM 9--2350--292--20--10025 00--1APU CONTROL BOX ENGINE OIL PRESSURE GAUGE READS ZERO WITHAPU ENGINE RUNNING.0025 00THIS WORK PACKAGE COVERS:APU Control Box Engine Oil Pressure Gauge Reads Zero With APU Engine RunningINITIAL SETUP:Tools and Special ToolsGeneral mechanic’s tool kit (item 1, WP 0717 00)Multimeter (item 84, WP 0717 00)Equipment ConditionsVehicle MASTER switch OFF (TM 9--2350--292--10)Personnel RequiredTwoIs 24 V dc present?1. Remove APU control box rear panel(WP 0247 00).2. Disconnect lead 420B from fuel gauge.3. Turn MASTER switch and APU FUELSHUTOFF switch to ON(TM 9--2350--292--10).4. Place red multimeter lead in lead 420B socketand black lead to ground. Check for voltage.5. Turn APU FUEL SHUTOFF and MASTERswitches to OFF.noyesAWARNINGRemove rings, bracelets, wristwatches,and neck chains before working on anyvehicle. Jewelry can catch on equip-ment and cause injury, or may shortacross an electrical circuit and causesevere burns or electrical shock.Go to Step C.CONTINUED ON NEXT PAGEBIs continuity present?Place one multimeter lead on oil pressure gaugeand the other lead to ground. Check for continuity.noyesRemove gauge (WP 0247 00)and clean grounding points ongauge and panel. Reinstallgauge and do step B again. Ifthere is still no continuity, re-place gauge (WP 0247 00).Replace oilpressure gauge(WP 0247 00 ).Verify fault iscorrected.
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