SECTION V: TROUBLESHOOTING
TM 9-2350-256-20
WARNING
Remove all jewelry such as rings, dog
tags, bracelets, etc. If jewelry contacts a
metal surface a direct short may result in
instant
heating
of
tools,
damage
to
equipment,
and
injury
or
death
to
personnel.
H
Reconnect wire 419 to APU FUEL SHUTOFF switch
side of 15 A circuit breaker. Disconnect wire 419 from
circuit breaker side of APU FUEL SHUTOFF switch.
Place red lead of multimeter in wire 419 and black lead
to ground. Turn MASTER switch on and check for
voltage. Turn MASTER switch OFF. If voltage is
present, go to step I. If voltage is not present,
repair/replace wire 419 of APU fuel shutoff lead
assembly (see paragraph 13-7).
I
Reconnect wire 419 to circuit breaker side of APU
FUEL SHUTOFF switch. Disconnect wire 421 from
APU FUEL SHUTOFF switch. Place red lead of
multimeter on terminal of APU FUEL SHUTOFF switch
and black lead to ground. Turn MASTER and APU
FUEL SHUTOFF switches ON and check for voltage.
Turn MASTER and APU FUEL SHUTOFF switches
OFF. If voltage is present, go to step J. If voltage is
not present, replace APU FUEL SHUTOFF switch (see
paragraph 13-7).
J
Reconnect wire 421 to APU FUEL SHUTOFF switch.
Disconnect connector from LOW OIL PRESS lamp.
Place red lead of multimeter in wire 27 and black lead
to ground. Turn MASTER and APU FUEL SHUTOFF
switches ON and check for voltage. Turn MASTER
and APU FUEL SHUTOFF switches OFF. If voltage is
present, go to step K. If voltage is not present,
repair/replace wire 421/27 of APU control box wiring
harness (see paragraph 13-7).
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