TM 9--2350--292--20--1
0025 00--2
APU CONTROL BOX ENGINE OIL PRESSURE GAUGE READS ZERO WITH
APU ENGINE RUNNING -- CONTINUED
0025 00
C
Is continuity present?
CONTINUED FROM STEP A
no
yes
CONTINUED ON NEXT PAGE
1. Disconnect harness 3W704 P1 at APU engine
disconnect.
2. Disconnect lead 420 from APU oil pressure
sending unit.
3. Place one multimeter lead on harness 3W704
P1 socket A and the other multimeter lead on
lead 420 lead connector socket. Check for
continuity.
D
Is continuity present?
no
yes
1. Reconnect lead 420 at oil pressure sending
unit.
2. Open air intake grilles over battery
compartment (TM 9--2350--292--10).
3. Disconnect harness 3W702 P1 at bulkhead
disconnect.
4. Place one multimeter lead on harness 3W702
P1 socket E and the other lead on harness
3W702 J2 pin A. Check for continuity.
Repair (WP 0290 00) or
replace (WP 0311 00)
harness 3W702. Verify
fault is corrected.
Repair (WP 0290 00) or
replace (WP 0643 00)
harness 3W704. Verify
fault is corrected.
