STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
C. CEL - FIRST CHART FOR DIAGNOSIS OF DDEC. III WHEN NO DDR IS AVAILABLE (Cont'd)
CEL-7
Check ECM
Connectors
Disconnect the power
Terminals and
Replace ECM. The go
harness connector at the ECM.
connectors are okay.
to CEL-30.
Check terminals at both the 5 way
power harness connector, and
Problem found.
Repair terminals/connectors.
vehicle harness connector (both
Then go to CEL-30.
the ECM and harness side) for
damage; bent, corroded and
unseated pins or sockets
CEL-8
Intermittent Check
Note whether flashing "Check
Flashing a
Go to CEL-9.
Engine" light is reading a valid
valid code.
code or if it's just erratic.
Erratic or
Go to Chart 1, page 3-345.57.
intermittent "Check
Engine" light.
CEL-9
Check for Short
Plug DDR into Connector.
Select Switch/Light Status.
Read Diagnostic Request SW.
ON
Circuit 528 is shorted
status.
to ground. Repair short,
then go to CEL-30
OFF
Go to Chart 5, page 3-345.91
CEL-30
Verify Repairs
Turn ignition off.
"Check Engine"
Repairs are complete.
Reconnect all connectors.
light comes on for up to
Turn ignition on.
5 seconds, then goes out.
Clear codes.
Turn ignition off.
"Check Engine"
All system diagnostics are
Turn ignition on while at the same
light is flashing.
complete. Please review this
time observing the "Check
section from the first step to find
Engine" Light.
the error.
"Check Engine"
Go to START-1, page 3-345.41.
light comes on and
stays on.
Change 3 3-345.55
