TROUBLESHOOTING THE M998 ELECT SYST. - OD1617 - LESSON 1/TASK 2
engine temperature), the engine can then be started.
engine is started, the glow plugs will continue to cycle (for up to 5
minutes), then stop cycling.
for 1 second and an off pulse for up to 15 seconds. To detect glow
plug system cycling, watch the voltmeter; the gage needle will move
to the left when the glow plugs are on, then return to its normal
position when the glow plugs are off. Also, a relay click should be
heard from the protective control box as the system switches on and
off. A multimeter may be used on any glow plug wire to observe the
operation of the glow plug system.
If the glow plugs continue to
cycle after the engine has been warmed up, the most probable cause is
to start the engine.
While reading through these paragraphs
the following page.
In this task, as with task 1, the reference
quotes "the TM" will refer to TM 9-2320-280-20, unless otherwise
Allow the engine to cool for 10 to 15 minutes
GLOW PLUG SYSTEM DOES NOT OPERATE PROPERLY ON
INITIAL START-UP (ENGINE CRANKS NORMALLY, ENGINE MECHANICALLY SOUND,
FUEL SYSTEM OPERATING NORMALLY.)
Remove the wiring harness connectors from all the glow
plugs. Using a multimeter, check the glow plug resistance. Replace
any glow plug not having 1.5-2.5 Ohms resistance. When replacing the
glow plug(s), follow the procedures contained in paragraph 3-38 of