TM 9--2350--292--20--1
0018 00--9
AUXILIARY POWER UNIT FAILS TO CRANK -- CONTINUED
0018 00
U
Is continuity present?
CONTINUED FROM STEP T
no
yes
V
no
yes
Is continuity present?
Replace PREHEAT
switch (WP 0247 00).
Verify fault is corrected.
Replace ground wire
(WP 0247 00). Verify
fault is corrected.
CONTINUED ON NEXT PAGE
1. Reconnect lead 4W123--4 to circuit breaker
CB2 connector.
2. Disconnect ground lead from PREHEAT
switch S2 connector.
3. Place multimeter leads across PREHEAT
switch and turn switch to MOM ON.
4. Check for continuity.
1. Reconnect lead 4W123--4 to PREHEAT
switch S2 connector.
2. Disconnect ground wire from APU GEN
switch S4 terminal 6.
3. Place multimeter leads across ground wire.
4. Check for continuity.
