TM 9--2350--292--20--1
0025 00--1
APU CONTROL BOX ENGINE OIL PRESSURE GAUGE READS ZERO WITH
APU ENGINE RUNNING.
0025 00
THIS WORK PACKAGE COVERS:
APU Control Box Engine Oil Pressure Gauge Reads Zero With APU Engine Running
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)
Personnel Required
Two
Is 24 V dc present?
1. Remove APU control box rear panel
(WP 0247 00).
2. Disconnect lead 420B from fuel gauge.
3. Turn MASTER switch and APU FUEL
SHUTOFF switch to ON
(TM 9--2350--292--10).
4. Place red multimeter lead in lead 420B socket
and black lead to ground. Check for voltage.
5. Turn APU FUEL SHUTOFF and MASTER
switches to OFF.
no
yes
A
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.
Go to Step C.
CONTINUED ON NEXT PAGE
B
Is continuity present?
Place one multimeter lead on oil pressure gauge
and the other lead to ground. Check for continuity.
no
yes
Remove gauge (WP 0247 00)
and clean grounding points on
gauge and panel. Reinstall
gauge and do step B again. If
there is still no continuity, re-
place gauge (WP 0247 00).
Replace oil
pressure gauge
(WP 0247 00 ).
Verify fault is
corrected.
