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Page Title:
CHECK ENGINE LIGHT (CEL) ON AND NO HISTORICAL OR ACTIVE CODES DISPLAYED ON DDR (CONT). |
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 TM 9-2320-364-20-1
A1 CHECK ENGINE LIGHT (CEL) ON AND NO HISTORICAL OR ACTIVE CODES
DISPLAYED ON DDR (CONT).
2.
KNOWN INFO
TEST OPTIONS
WARNING
READ WARNING
Visual inspection.
CEL diagnostic request line
on Page 2-153
wire 451 OK.
REASON FOR QUESTION
POSSIBLE PROBLEMS
Does CEL go OUT with
Wire 419 is shorted if CEL
vehicle harness connector
stays ON with vehicle harness
Short in CEL driver line
MC18 disconnected at DDEC
disconnected.
wire 419.
ECM and ENGINE switch ON
Damaged harness connectors.
(engine not running)?
Repair wire 419 (see
schematic Fig 2-1)
or notify DS
NO
Maintenance.
Verify repair, go to
Step 4 of this Fault.
YES
3.
KNOWN INFO
TEST OPTIONS
CAUTION
READ CAUTION
CEL diagnostic request line
Visual inspection.
on Page 2-153
wire 451 OK.
CEL driver line wire 419 OK.
REASON FOR QUESTION
Are DDEC ECM connector
POSSIBLE PROBLEMS
CEL will not operate properly if
MC18 terminals and
harness connectors are
connectors (DDEC ECM and
damaged.
Damaged harness connectors.
harness side) free from
damage?
Repair connectors
(Para 7-101).
NO
Verify repair, go to
Step 4 of this Fault.
YES
Replace DDEC ECM
(Para 7-56).
Verify repair, go to
Step 4 of this Fault.
2-152
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