2-19. TROUBLESHOOTING CHART (continued).u. AUXILIARY POWER UNIT (continued).(2) ENGINE FAILS TO CRANK. All other electricalsyetems operate.Initial Setup:Tools/Test Equipment:Equipment Conditions:l Digital multimeter (DMM) (Item 13, Appendix 1)l APU plenum removed (para 18-17).l General mechanic’s tool kit (Item 24,l APU compartment access plate removedAppendix 1)(para 15-39).l Projectile racks moved to rear of vehiclePersonnel Required: Two(refer to TM 9-2350-287-10).l APU cylinders shroud removed (para 18-14).NOTEl Instead of using multi meterfor voltage check, STE/lCEtroubleshooting, INDIVIDUALBATTERY VOLTAGE TEST-TEST89 maybe performed.l Instead of using multi meterfor continuity check, STE/lCEtroubleshooting, TEST 91 maybe performed.A. 1. Disconnect lead 66 from APU starter/gen-erator positive terminal B.2. Place red probe of multimeter on lead 68and black probe to ground.3. With the aid of an assistant, turn MASTERswitch ON and hold APU START AND PRE-HEAT switch ON (refer to TM 9-2350-287-10).4. Check for voltage 24 ± 3 vdc.5. Release APU START AND PREHEATswitch and turn MASTER switch OFF (refer toTM 9-2350-287-10).Is voltage indicated?Continued on next page2-303TM 9-2350-287-20-1
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