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TM 5-4210-233-14&P-1
Table 4-2. Unit Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
PUMP COMPARTMENT - Continued
3
ENGINE MONITORING GAUGE NOT OPERATING
Step
1.
Replace gauge with known working gauge.
If gauge does not operate, refer to Step 2.
Step
2.
Test sending unit or replace with known working sending unit.
If gauge does not operate, refer to Step 2.
Step
3.
Refer to Electrical System troubleshooting.
AUXILIARY POWER UNIT
1
STARTER WILL NOT CRANK APU ENGINE
Step
1.
Battery switch set OFF.
Set battery switch to position 1 or 2.
Step
2.
Batteries low in charge.
Charge batteries.
Step
3.
Engine starter switch faulty.
Replace starter switch (see para 4-84).
2
APU ENGINE CRANKS NORMALLY BUT WILL NOT START
Step
1.
Check fuel level.
Add fuel and prime system.
Step
2.
Air in fuel system.
Remove connection to injector, turn start swdtch and prime until fuel appears out of
injector connection.
Step
3.
Broken fuel line or blocked fuel filter.
Check for leakage/blockage. Replace/repair as required (see para 4-210 and 4-211).
Step
4.
Failed fuel pump.
Replace fuel pump (see para 4-216).
4-29
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