TM 9--2350--292--20--1
0016 00--3
APU CONTROL BOX ENGINE OIL PRESSURE GAUGE READS ZERO WITH
APU ENGINE RUNNING -- CONTINUED
0016 00
D
Is continuity present?
CONTINUED FROM STEP C
no
yes
CONTINUED ON NEXT PAGE
1. Disconnect harness 3W704 connector P1 at
APU engine disconnect.
2. Disconnect lead 420 from APU oil pressure
sending unit.
3. Place one multimeter lead on harness 3W704
connector P1 socket A and the other
multimeter lead on lead 420 lead connector
socket. Check for continuity.
E
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 connector P1 at
bulkhead disconnect.
4. Place one multimeter lead on harness 3W702
connector P1 socket E. Place the other
multimeter lead on the APU engine disconnect
receptacle J2 pin A. Check for continuity.
Repair (WP 0290 00) or
replace (WP 0311 00)
harness 3W702. Verify
fault is corrected.
Replace APU oil send-
ing unit (WP 0631 00).
