TM 9-2320-387-24-l
PROTECTIVE CONTROL BOX
KNOWN INFO
BAllERlES
OK
LEAD 578
GROUND OK
IGNITION SWlTCH OK
HARNESS WIRE 29A OK
HARNESS WIRE 29C OK
PARKING BRAKE SWITCH OK
BODY HARNESS WIRES OK
GLOW PLUG CONTROLLER
OK
ALTERNATOR OK
HARNESS WIRE 2A OK
POSSIBLE PROBLEMS
PROTECTlVE CONTROL
BOX BAD
I
KNOWN INFO
BAlTERIES
OK
LEAD 578 GROUND OK
IGNlTlON SWTCH OK
HARNESS WIRE 29A OK
HARNESS WIRE 29C OK
PARKING BRAKE SWITCH OK
BODY HARNESS WIRES OK
ALTERNATOR OK
HARNESS WIRE 2A OK
PROTECTIVE CONTROL BOX
OK
POSSIBLE PROBLEMS
GLOW PLUG CONTROLLER
BAD
S LED 11 CYCLING ON AND
3FF?
DIAGNOSTIC FLOWCHART
-
I OPTlONS
VISUAL
REASON FOR QUESTION
If LED is not cycling ON and OFF,
that would indicate
a PCB
malfunction.
1 TEST OPTIONS
AT ENGINE OPERATING
TEMPERATURE, DOES LED 11
STOP CYCLING ON AND OFF?
VISUAL
I
REASON FOR QUESTION
If LED does not stop cycling ON
IF
1
glow plug controller
malfunction.
TEST CHAIN AGAIN
and OFF, that woulb indicate a
IS REPLACED.
NO PROTECTIVE CONTROL BOX
FAULT FOUND.
2-230
