TM 9--2350--292--20--1
0009 00--2
AUXILIARY POWER UNIT FAILS TO CRANK -- CONTINUED
0009 00
Is 24 V dc present?
1. Remove forward air intake grilles
(TM 9--2350--292--10).
2. Disconnect harness 3W711 P1 at APU engine
disconnect.
3. Turn MASTER switch ON (TM 9--2350--292--10).
4. Place multimeter red lead on harness 3W702 J1
socket A and black lead to ground. Check for
voltage.
5. Turn MASTER switch OFF
(TM 9--2350--292--10).
no
yes
C
Is 24 V dc present?
1. Reconnect harness 3W711 P1.
2. Remove APU preheater relay/fuel solenoid
access cover.
3. Disconnect lead N at preheater relay.
4. Turn MASTER switch ON (TM 9--2350--292--10).
5. Place multimeter red lead in lead N connector
and black lead to ground. Check for voltage.
6. Turn MASTER switch OFF
(TM 9--2350--292--10).
D
Repair (WP 0290 00) or replace (WP 0311 00 )
harness 3W702. Verify fault is corrected.
no
yes
Repair (WP 0290 00) or replace (WP 0648 00)
harness 3W711. Verify fault is corrected.
Is 24 V dc present?
1. Remove APU preheater relay/fuel solenoid access
cover.
2. Disconnect lead P from preheater relay.
3. Turn MASTER switch ON
(TM 9--2350--292--10).
4. Place multimeter red lead in lead P connector and
black lead to ground. Check for voltage.
5. Turn MASTER switch OFF
(TM 9--2350--292--10).
6. Reconnect lead P to preheater relay.
E
CONTINUED ON NEXT PAGE
CONTINUED FROM STEP B
no
yes
Repair or replace lead P (WP 0655 00).
Verify fault is corrected.
Go to step F.
CONTINUED FROM STEP B
Go to step U.
