TM 1-1520-238-T-4
4–131
4–49.
ENGINE 1 – DOES NOT START
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
152FG
Pilot
References:
TM 1-1520-238-23
TM 55-2840-248-23
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. With power applied, set and hold ENG START
NO 1 switch in START position, check for open
between:
J21–17 and J21–18,
J21–19 and J21–18.
Does open exist?
YES
Go to step 2.
NO
Go to step 3.
2. Check for open between J21–17 and J21–19.
Does open exist?
YES
Go to step 4.
NO
Go to step 6.
3. Remove relay (A402)K1–5/6. Set and hold ENG
START NO 1 switch in START position, check
for 28 VDC at (A402)XK1–5/6–X1.
Is voltage present?
YES
Go to step 5.
NO
Go to step 7.
4. Check for open between (A330):
J1–B11 and J1–B12.
Does open exist?
YES
Repair open wire between
(A330):
J1–B11 and J1–B12.
Go to paragraph 4–12.
NO
Repair open wire between:
J21–17 and P977–B11,
J21–19 and P977–B12.
Go to paragraph 4–12.
5. Check for open between (A402)XK1–5/6–X2
and ground.
Does open exist?
YES
Repair open wire.
Go to paragraph 4–12.
NO
Replace relay (A402)K1–5/6
(TM 1-1520-238-23).
6. Check for open between:
P21–17 and P45–17,
P2 1–19 and P45–19.
Does open exist?
YES
(ABY) Repair open wire. Go to
paragraph 4–12.
(ABZ) Replace wire harness
(TM 1-1520-238-23).
NO
Refer to TM 55-2840-248-23 to
troubleshoot engine ignition
system.
