TM 9-2320-387-24-l
I
KNOWN INFO
1
BAllERIES
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
PROTECTIVE CONTROL BOX
IS LED 9 OFF AND 12 ON?
BOX BAD
I
KNOWN INFO
I
BATI-ERIES OK
WD
578 GROUND OK
IGNlTlON SWITCH OK
HARNESS WIRE 29A OK
HARNESS WIRE 29C OK
PARKING BRAKE SWITCH OK
BODY HARNESS WIRES OK
GLOW PLUG CONTROLLER OK
POSSIBLE
PROBLEMS
ALTERNATOR BAD
I
HARNESS WIRE 2A BAD
PROTECTlVE CONTROL BOX
I
KNOWN INFO
BATIERIES
OK
LEAD 578 GROUND OK
IGNlTlON SWITCH OK
HARNESS WIRE 29A OK
HARNESS WIRE 29C OK
PARKING BRAKE SWITCH OK
BODY HARNESS WIRES OK
ALTERNATOR OK
HARNESS WIRE 2A OK
POSSIBLE
PROBLEMS
I
GLOW PLUG CONTROLLER BA
PROTECTIVE CONTROL BOX
BAD
DIAGNOSTIC FLOWCHART
T OPTIONS
VISUAL
PROTECTIVE
REASON FOR QUESTlON
If this LED condition does
not exist, that would indicate
a PCB malfunction.
ARE LEDs 9 AND 12 ON?
VISUAL
If these LEDs are OFF, that would
indicate a malfunctioning
alternator or damaged harness
HARNESS WIRE
WHILE ENGINE IS NOT AT
OPERATING TEMPERATURE,
IS LED 11 ON?
’ TEST OPTIONS
1
VISUAL
REASON FOR QUESTION
If this LED is not ON,
that would indicate a glow plug
controller malfunction.
TEST CHAIN AGAIN IF
GLOW PLUG
CONTROLLER
IS
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