TM 5-3740-218-13&P
Table 5-1. Direct Support Troubleshooting
Malfunction
Test or Inspection
Corrective Action
ENGINE AND PUMP ASSEMBLY
1. ENGINE FAILS TO START.
WARNING
Failure to disconnect battery can result in personal injury or damage to equipment.
Step 1. Check for defective key switchbox.
Disconnect battery.
Set engine switch to OFF position.
Inspect for loose, broken, or missing wires or blown fuse
inside key switchbox. Tighten, repair, or replace wires or
blown fuse (para 5-5).
Check continuity of oil level switch:
With multimeter set to ohms scale, measure resistance
between black and yellow leads, black lead to ground, and
yellow lead to ground. Readings should not exceed 0.1 ohm. If
readings exceed 0.1 ohm, replace key switchbox (para 5-5).
Check continuity of key switch:
With multimeter set to ohms scale, measure resistance
between black and green leads, yellow and green leads, and
yellow lead to ground. Readings should not exceed
4 K ohms. If readings exceed 4 K ohms, replace key
switchbox (para 5-5).
Set engine switch to ON position.
Check continuity of oil level switch:
With multimeter set to ohms scale, measure resistance
between black and yellow leads. If reading exceeds 0.1 ohm,
replace key switchbox (para 5-5).
With multimeter set to ohms scale, measure resistance
between black lead and ground, and yellow lead and ground.
If readings are not 1 M ohm minimum, replace key switchbox
Check continuity of key switch:
With multimeter set to ohms scale, measure resistance
between green lead and ground. If reading exceeds
4 K ohms, replace key switchbox (para 5-5).
