TM 9--2350--292--20--1
0018 00--10
AUXILIARY POWER UNIT FAILS TO CRANK -- CONTINUED
0018 00
CONTINUED FROM STEP V
W
no
yes
no
yes
X
Is continuity present?
Y
no
yes
CONTINUED ON NEXT PAGE
Is continuity present?
Replace generator
switch S4 (WP 0247 00).
Verify fault is corrected.
Repair (WP 0290 00) or replace
(WP 0658 00) lead 3W732 wire R.
Verify fault is corrected.
1. Reconnect ground wire to PREHEAT switch
S2 connector.
2. Disconnect ground wire from APU GEN switch
S4 terminal 5.
3. Place multimeter leads across APU GEN
switch S4 terminals 5 and 6.
4. Check for continuity.
1. Reconnect ground wire to APU GEN switch
S4 terminals 6.
2. Place multimeter red lead onto 4W725 pin C
and black lead on to ground wire.
3. Check for continuity.
4. Reconnect ground wire to APU GEN switch
S4 terminal 5.
Is continuity present?
Repair (WP 0290 00) or replace
(WP 0247 00) harness 4W725.
Verify fault is corrected.
1. Disconnect lead 3W732 wire R from the preheat
solenoid and from glow plug connector.
2. Place multimeter red leads across harness
3W732 connectors.
3. Check for continuity.
4. Reconnect harness 3W732 wire R to the
preheat solenoid connector.
