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Page Title:
CHECK ENGINE LIGHT (CEL) ALWAYS OFF (CONT). |
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 TM 9-2320-364-20-1
B CHECK ENGINE LIGHT (CEL) ALWAYS OFF (CONT).
8.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
CHECK ENGINE light (CEL)
Visual inspection.
on Page 2-425
does not illuminate.
DDEC ECM vehicle harness
REASON FOR QUESTION
connector OK.
Are DDEC ECM terminals and
CEL OFF with jumperwire
Damaged DDEC ECM terminals
connectors (DDEC ECM and
installed at vehicle harness
and connectors can affect signal
connector.
harness side) free from
to DDEC ECM.
No short in +12 volt line
damage?
wire 439.
CEL indicator lamp OK.
No open in CEL driver wire 419.
No open in +12 volt wire 439.
No short/open in battery positive
Repair connectors
wires 240 or 241.
(Para 7-101) or
No open in ground wire 150.
replace DDEC ECM
NO
(Para 7-56).
POSSIBLE PROBLEMS
Verify repair, go to
Step 9 of this Fault.
Damaged DDEC ECM terminals
or connectors.
YES
Replace DDEC ECM
(Para 7-56).
Verify repair, go to
Step 9 of this Fault.
9.
KNOWN INFO
TEST OPTIONS
CHECK ENGINE light (CEL)
Verify repair.
Does CEL come ON for five
does not illuminate.
seconds and go OFF?
DDEC ECM vehicle harness
REASON FOR QUESTION
connector OK.
CEL OFF with jumperwire
If CEL lights for approximately
installed at vehicle harness
five seconds and then goes
connector.
OUT after ENGINE switch is
No short in +12 volt line
turned to ON, fault has been
wire 439.
corrected.
CEL indicator lamp OK.
No open in CEL driver wire 419.
No open in +12 volt wire 439.
No short/open in battery positive
wires 240 or 241.
No open in ground wire 150.
Go to Fault Index
DDEC ECM terminals and
NO
connectors OK.
POSSIBLE PROBLEMS
YES
Fault corrected.
2-424
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