2-19. TROUBLESHOOTING CHART (continued).
u. AUXILIARY POWER UNIT (continued).
(2) ENGINE FAILS TO CRANK. All other electrical
syetems 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 removed
Appendix 1)
(para 15-39).
l Projectile racks moved to rear of vehicle
Personnel Required: Two
(refer to TM 9-2350-287-10).
l APU cylinders shroud removed (para 18-14).
NOTE
l Instead of using multi meter
for voltage check, STE/lCE
troubleshooting, INDIVIDUAL
BATTERY VOLTAGE TEST-TEST
89 maybe performed.
l Instead of using multi meter
for continuity check, STE/lCE
troubleshooting, TEST 91 may
be performed.
A. 1. Disconnect lead 66 from APU starter/gen-
erator positive terminal B.
2. Place red probe of multimeter on lead 68
and black probe to ground.
3. With the aid of an assistant, turn MASTER
switch 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 PREHEAT
switch and turn MASTER switch OFF (refer to
TM 9-2350-287-10).
Is voltage indicated?
Continued on next page
2-303
TM 9-2350-287-20-1
