TROUBLESHOOTING THE M998 ELECT SYST. - OD1617 - LESSON 1/PE 1
LESSON 1.
PRACTICAL EXERCISE - ANSWERS
Requirement
a.
The electrical
system
on
the
HMMWV
is
made
up
of
fifteen
components.
b.
The six rules of troubleshooting are:
(1) Rule 1. Question the operator to obtain any information that
might help in determining the cause of the malfunction.
(2) Rule 2. Never overlook the chance that the problem could be
of simple origin.
The problem could be corrected with minor
adjustment.
(3) Rule 3.
Use all senses to observe and locate the trouble.
(4) Rule 4. Use test instruments and gages to help you determine
and isolate the problem.
(5) Rule 5.
Always isolate the system where
the
malfunction
occurs and then locate the deffective component.
(6) Rule 6. Use standard automotive theories and principles when
troubleshooting the systems covered.
c.
The specific gravity of the electrolyte should be below 1.250.
d.
Prior to disconnecting any connector from the protective control
box, the negative battery cable must first be disconnected.
When the engine is below 120 F and the
e.
rotary switch is
positioned to RUN, the WAIT-TO-START lamp lights,
then goes off (on
for up to fifteen seconds, depending on engine
temperature), the
engine then can be started, the glow plugs will
continue to cycle
(for up to 5 minutes), then stop cycling.
f.
When measuring glow plug resistance, the resistance should be
between 1.5 to 2.6 Ohms.
The engine temperature should be above 85 F.
g.
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