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TM 5-4210-220-12
Table 4-2 UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2g
PUMP SUCTION OR DISCHARGE GAGE NOT OPERATING
Step 1
Gage failed.
Replace gage, (see para. 4-24).
Step 2
Water pressure line blocked or disconnected either end.
Replace/tighten hose or connections as required.
2h
ENGINE MONITORING GAGE NOT OPERATING
Gage, sender unit, harness plug, or wire failed.
Replace failed component, (see para. 4-24).
3a
STARTER WILL NOT CRANK APU ENGINE
Step 1
Battery switch set to OFF.
Set battery switch to BOTH.
Step 2
Batteries low in charge.
a
Start with hand crank.
b
Charge batteries.
Step 3
Engine starter switch faulty.
Replace starter switch.
Step 4
Starter, or starter solenoid failed.
Replace starter.
3b
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 switch and prime until fuel appears out of injector
connection.
4-25
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