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TM9-2320-360-20-3
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 5-way power
harness connector at the ECM.
Check terminals at both the 5-way
power harness connector, and
vehicle harness connector (both
the ECM and harness side) for
damage; bent, corroded and
unseated pins or sockets.
CEL-8
Intermittent Check
Note whether flashing “Check
Engine” light is reading a valid
code or if it’s just erratic.
CEL-9
Check for Short
Plug DDR into DDL connector.
Select SWITCH/LIGHT STATS
on DDR.
Read Diagnostic Request SW.
status.
CEL-30 Verify Repairs
Turn ignition off.
Reconnect all connectors.
Turn ignition on.
Clear codes.
Turn ignition off.
Turn ignition on while at the same
time observing the “Check
Engine” light.
RESULT
WHAT TO DO NEXT
Terminals and
connectors are okay.
Problem found.
Replace ECM (para 7-29.1).
Then go to CEL-30.
Repair terminals/connectors
(para 7-77). Then go to CEL-30.
Flashing a
v a l i d c o d e .
Erratic or
intermittent “Check
Engine” light.
Go to CEL-9.
Go to Chart 1, page H-40.
ON.
Circuit #528 is shorted
to ground. Repair short,
then go to CEL-30.
OFF.
Go to Chart 5, page H-71.
“Check Engine”
light comes on for up to
Repairs are complete.
5 seconds, then goes out.
“Check Engine”
light is flashing.
All system diagnostics are
complete. Please review this
section from the first step to find
the error.
“Check Engine”
light comes on and
stays on.
Go to START-1, page H-25.
H-39
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