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TM 5-4210-233-14&P-1
4-2. Unit Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM - APU AND 11O-VOLT CIRCUITS
1
AUXILIARY POWER UNIT (APU) DOES NOT START/RUN WITH CAB OR PUMP PANEL
CONTROLS (Refer to Electrical Wiring Diagrams, Appendix H, Sheet 15 of 16.)
Step 1. Check switch.
Replace switch (see para 4-22 or 4-94).
Step 2. Check common/start wires for continuity.
Replace wire (see para 4-9.4).
Step 3. Check electric fuel pump for proper operation.
Replace fuel pump (see para 4-216).
Step 4. Check APU start solenoid for proper operation.
Replace solenoid, Notify Direct Support.
Step 5. Check APU cranking motor.
Replace motor, Notify Direct Support.
2
AUXILIARY POWER UNIT (APU) RUNS, BUT NO POWER OUTPUT
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 15 of 16.)
Step 1. Check fuse on APU.
Replace fuse (see para 4-9.4).
Step 2. Check service panel circuit breakers are on.
Turn on service panel breaker.
Step 3. Check wiring for continuity.
Replace wire (see para 4-9.4).
Step 4. Check pump panel and cab panel volt and ammeters for output from APU.
Refer to APU troubleshooting procedures.
4-142
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