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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
C. START - FIRST CHART FOR DIAGNOSIS OF DDEC-III USING DDR (Cont’d)
STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
START-5
Read All Codes
Again
Read inactive codes
on DDR.
START-6
Read Codes on
the “Check
Engine” Light
Unplug the DDR.
Ignition on.
Engine not running.
Depress and hold
diagnostic request switch.
Read codes flashing out on the
“Check Engine” light.
START-7
Intermittent
“Check Engine”
Light
Note whether flashing ‘Check
Engine” light is reading a valid
code or if it’s just erratic.
Any codes.
Follow appropriate diagnostic
chart for codes received. (See
Table of Contents on page ii).
DDR display reads
Go to Chart 7, page H-79.
“NO DATA BEING
RECEIVED FROM
SYSTEM” or ‘DDEC
SYSTEM NOT
I
RESPONDING”.
DDR display is
Go to START-9.
blank or random.
Flashes out
codes.
To diagnose codes, follow
appropriate diagnostic chart for
codes received. (See page ii).
To diagnose DDR system, go to
C7-4, page H-91.
Does not flash
out codes.
Go to Chart 9, page H-91.
Flashing a
valid code.
Go to START-8
Erratic or
intermittent “Check
Engine” light.
Go to Chart 1, page H-40.
H-29
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