TM 9--2350--292--20--1
0009 00--9
AUXILIARY POWER UNIT FAILS TO CRANK -- CONTINUED
0009 00
CONTINUED FROM STEP E
Does relay click?
1. Hold PREHEAT switch ON and turn START
switch ON and OFF several times
(TM 9--2350--292--10). Listen for starter relay
to click.
2. Turn MASTER switch OFF
(TM 9--2350--292--10).
U
no
yes
Go to step AB.
Is continuity present?
1. Disconnect lead 65 from preheater relay and
harness 3W711 P1 from APU engine
disconnect.
2. Place one multimeter lead on preheater lead
65 connector and other lead on harness
3W711 P1 pin C. Check for continuity.
no
yes
V
Is continuity present?
1. Reconnect lead 65 to preheater relay
connector.
2. Disconnect harness 3W702 P1 at bulkhead
disconnect.
3. Place one multimeter lead in harness 3W702
P1 socket J and other lead in harness 3W702
J1 socket C. Check for continuity.
W
Repair (WP 0290 00) or replace
(WP 0648 00) harness 3W711.
Verify fault is corrected.
no
yes
Repair (WP 0290 00) or replace
(WP 0311 00) harness 3W702.
Verify fault is corrected.
CONTINUED ON NEXT PAGE
