TM 9-2350-287-20-12-19. TROUBLESHOOTING CHART (continued).u. AUXILIARY POWER UNIT (continued).(5) ENGINE OVERHEATS.Initial Setup:Tools/Test Equipment:l Digital multimeter (DMM) (Item 13, Appendix 1)l General mechanic’s tool kit (Item 24,Appendix 1)Personnel Required: TwoEquipment Conditions:l APU side door opened (refer toTM 9-2350-287-10).A. 1. Start the APU (refer to TM 9-2350-287-10).2. While APU is running, make sure APU fan isrotating.B. 1. Shut down the APU (refer to TM 9-2350-287-10).2. If HIGH AIR Temperature light is on afterAPU engine has cooled, disconnect lead 493from high air temperature switch on APUengine.C. Disconnect harness 12329650 connector atAPU compartment wall.2. Using multimeter, check for continuitybetween lead 493 and pin C of connector.3. Check for continuity2-314Continued on next page
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