KNOWN INFO
POSSIBLE PROBLEMS
DIAGNOSTIC FLOWCHART
TEST OPTIONS
REASON FOR QUESTION
TEST OPTIONS
REASON FOR QUESTION
NO
YES
NO
YES
PROTECTIVE CONTROL BOX/DISTRIBUTION BOX
2-244 Change 1
BATTERIES OK
LEAD 57B GROUND OK
IGNITION SWITCH OK
HARNESS WIRE 29A OK
HARNESS WIRE 29C OK
PARKING BRAKE SWITCH OK
BODY HARNESS WIRES OK
GLOWPLUG CONTROLLER
OK
ALTERNATOR OK
HARNESS WIRE 2A OK
PROTECTIVE CONTROL
BOX BAD
FROM 24,
Page 2-242
GO TO 28,
Page 2-246
NO PROTECTIVE CONTROL BOX
OR DISTRIBUTION BOX FAULT
FOUND.
25
26
27
VISUAL
If LED does not stop cycling ON
and OFF, that would indicate a
glowplugs controller malfunction.
AT ENGINE OPERATING
TEMPERATURE, DOES LED 11 STOP
CYCLING “ON” AND “OFF”?
NOTE: LED 11 DOES NOT FUNCTION
WITH DISTRIBUTION BOX.
GO TO D1,
Page 2-314 AND BEGIN
TEST CHAIN AGAIN IF
GLOW PLUG CONTROLLER
IS REPLACED
IS LED 11 CYCLING “ON” AND
“OFF”?
NOTE:
LED 11 DOES NOT FUNCTION
WITH DISTRIBUTION BOX.
REPLACE
PROTECTIVE
CONTROL BOX
VISUAL
If LED is not cycling ON and OFF,
that would indicate a protective
control box (PCB) malfunction.
TM 9-2320-280-20-1
KNOWN INFO
POSSIBLE PROBLEMS
BATTERIES OK
LEAD 57B GROUND OK
IGNITION SWITCH 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
GLOWPLUG CONTROLLER
BAD
