TM 9--2350--292--20--1
0009 00--3
AUXILIARY POWER UNIT FAILS TO CRANK -- CONTINUED
0009 00
no
yes
Repair (WP 0290 00) or replace
(WP0648 00) harness 3W711.
Verify fault is corrected.
CONTINUED FROM STEP D
Is continuity present?
1. Disconnect lead 487 at preheater relay and
disconnect harness 3W711 P1 at APU
engine disconnect.
2. Place one multimeter lead on lead 487 and
place other lead on pin D of harness 3W711
P1. Check for continuity.
F
Is continuity present?
1. Reconnect lead 487 at preheater relay.
2. Open air intake grilles above battery
compartment (TM 9--2350--292--10).
3. Disconnect harness 3W702 P1 at bulkhead
disconnect.
4. Place one multimeter lead in socket D of
3W702 J1 and other lead in harness 3W702 P1
socket B. Check for continuity.
G
no
yes
Repair (WP 0290 00) or replace
(WP 0311 00) harness 3W702.
Verify fault is corrected.
Is continuity present?
1. Reconnect harness 3W711 P1 at APU engine
disconnect.
2. Disconnect harness 4W700 P1 at APU control
box.
3. Disconnect harness 4W700 P2 from bulkhead
disconnect.
4. Place one multimeter lead on pin B of harness
4W700 P2 and other lead in socket A of harness
4W700 P1. Check for continuity.
H
no
yes
Repair (WP 0290 00) or replace
(WP 0332 00) harness 4W700.
Verify fault is corrected.
CONTINUED ON NEXT PAGE
