STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
C. START - FIRST CHART FOR DIAGNOSIS OF DDEC-III USING DDR (Cont'd)
START-8
Check for Short
Plug DDR into Connector.
Select Switch/Light Status.
Read Diagnostic Request SW.
ON.
Ckt #528 is shorted
status.
to ground. Repair short,
then go to START-30
OFF.
Go to Chart 9, page 3-345.111.
START-9
Check for +12
Volts at DDR
Connector
Turn ignition on.
Greater than
There is a problem with either the
Read voltage at the DDR
or equal to 10.0 volts.
DDR or the data link lines. Go to
connector, from pin "C" (red lead)
C7-4, page 3-345.101. (For
to pin "E' (black lead).
diagnosis of DDEC-III without a
DDR,
go to CEL-1 on page 3-345.51.
Less than
Either the switched +12 volt line
10.0 volts.
or the ground line is open to the
DDR connector. Repair open.
Then go to START-30.
START-10 Check ECM
Connectors
Disconnect the 5-way power
Terminals and
Replace ECM. Then go to
harness connector at the ECM.
connectors are okay.
START-30.
Check terminals at the ECM 5-way
power and vehicle harness
Problem found.
Repair terminals/connectors.
connectors (both the ECM and
Then go to START-30.
harness side) for damage; bent,
corroded and unseated pins or
sockets.
Change 3 3-345.47
