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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-8
Check for Short
Plug DDR into Connector.
Select SWITCH/LIGHT STATS
on DDR.
l Read Diagnostic Request SW.
status.
START-9
Check for +12
Volts at DDR
Connector
l Turn ignition on.
l Read voltage at the DDR
connector, from pin “C” (red lead
to pin “E” (black lead).
ON.
Ckt #528 is shorted
to ground. Repair short,
then go to START-30.
OFF.
Go to Chart 9, page H-91.
Greater than
or equal to 10.0 volts.
There is a problem with either the
DDR or the data link lines. Go to
C7-4, page H-81. (For diagno-
sis of DDEC III without a DDR,
go to CEL-1 on page H-35.
Less than
10.0 volts.
Either the switched +12 volt line
or the ground line is open to the
DDR connector. Repair open.
Then go to START-30.
H-31
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