TM 9--2350--292--20--1
0011 00--1
AUXILIARY POWER UNIT ENGINE HARD TO START IN COLD WEATHER
0011 00
THIS WORK PACKAGE COVERS:
Auxiliary Power Hard To Start in Cold Weather
INITIAL SETUP:
Tools and Special Tools
General mechanic’s tool kit (item 1, WP 0717 00 )
Multimeter (item 84, WP 0717 00)
Equipment Conditions
Vehicle MASTER switch OFF (TM 9--2350--292--10)
APU cover removed (WP 0413 00)
Personnel Required
Two
Is continuity present at all tests?
1. Disconnect circuit R leads from preheater relay,
all glow plugs and preheaters.
2. Place one multimeter lead on lead R lead
connector and other lead on all glow plug and
preheater leads (one at a time). Check for
continuity.
no
yes
Is 4.75 + 1.5 ohms indicated at all tests?
1. Reconnect lead R lead to preheater relay.
2. Place one multimeter lead on glow plugs (one
at a time) and other lead to ground. Check
for resistance.
Repair (WP 0290 00) or re-
place (WP 0657 00) lead R
lead(s) to respective glow
plug and/or preheater.
Verify fault is corrected.
no
yes
Notify Direct Support
Maintenance.
A
B
WARNING
Remove rings, bracelets, wristwatches,
and neck chains before working on any
vehicle. Jewelry can catch on equip-
ment and cause injury, or may short
across an electrical circuit and cause
severe burns or electrical shock.
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