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Page Title: CEL - FIRST CHART FOR DIAGNOSIS OF DDEC III/IV WHEN NO DDR IS AVAILABLE (Cont'd)
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TM 9-2320-364-20-1
Section IV. TROUBLESHOOTING CHARTS (Cont.)
C. CEL - FIRST CHART FOR DIAGNOSIS OF DDEC III/IV WHEN NO DDR IS AVAILABLE (Cont'd)
STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
CEL-7
Check ECM
Connectors
Disconnect the 5-way power
Terminals and
Replace ECM (para 7-57).
harness connector at the ECM.
connectors are okay.
Then go to CEL-30.
Check terminals at both the 5-way
power harness connector, and
Problem found.
Repair terminals/connectors
vehicle harness connector
(para 7-101). Then go to CEL-30.
(both 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 2-554.
intermittent "Check
Engine" light.
CEL-9
Check for Short
Plug DDR into DDL connector.
Select SWITCH/LIGHT STATS
on DDR.
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 2-585.
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
Engine" light.
to find the error.
"Check Engine"
Go to START-1, page 2-539.
light comes on and
stays on.
2-553

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