page 3-164
page 3-169
page 3-311
Section 4
TROUBLESHOOTING CHARTS
C. START •
FIRST CHART FOR DIAGNOSIS OF DDEC-II USING DDR
WARNING: The engine and ignition should always be off before connecting or disconnecting sensors or wiring
harness. Failure to follow this warning could damage the ECM.
STEP/SEQUENCE
START-1 Note "Check
Engine” Light
• Turn ignition on while at the same
time observing the “Check
Engine” light.
• Be sure there is not a jumper wire
between pins A and M of the DDL
connector and any switch for
flashing out codes should be in
the off position.
START-2 Read Active
Codes Using DDR
• Plug DDR into the 12 pin
DDL connector.
• Read active codes by selecting
MODE 01 (ACTIVE CODES) on
the DDR.
• Read historical codes by selecting
MODE 02 (HISTORICAL CODES)
on the DDR.
• Record ail active and
historical codes.
TM 9-2320-363-20-1
RESULT
WHAT TO DO NEXT
Light comes
on and stays on.
Light comes
on for up to 5 seconds,
then goes out.
Light is off.
Erratic or
intermittent light.
A c t i v e c o d e s
Follow appropriate diagnostic
(other than Code 25)
charts for code(s) received.
on DDR.
(See Index on page 3-101).
Active Code 25
and historical Code 51
(other codes may be
present).
Active Code 25 only.
,
DDR display reads
l
"NO DATA BEING
RECEIVED FROM DATA
LINK” or "DDEC SYSTEM
NOT RESPONDING”.
DDR display is
blank or random.
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