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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).
3.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
CHECK ENGINE light (CEL)
Voltage test.
on Page 2-419
does not illuminate.
STE/ICE-R #89.
Are there
DDEC ECM vehicle harness
10 to 14
connector OK.
REASON FOR QUESTION
vdc measured between wire
CEL OFF with jumperwire
439 at vehicle harness
installed at vehicle harness
Less than 10 volts at vehicle
connector MC18, terminal B3
connector.
harness connector indicates
and a known good ground
wire 439 (+12 volt line) is
with engine switch on?
shorted to ground.
POSSIBLE PROBLEMS
Short in +12 volt wire 439.
CEL indicator lamp faulty.
Open in CEL driver wire 419.
Repair wire 439 (see
Open in +12 volt wire 439.
schematic Fig 2-1) or
Short/Open in battery positive
notify DS
wires 240 or 241.
NO
Maintenance.
Open in ground wire 150.
Verify repair, go to
Damaged DDEC ECM terminals
Step 9 of this Fault.
or connectors.
YES
4.
KNOWN INFO
TEST OPTIONS
CHECK ENGINE light (CEL)
Is continuity measured
Continuity test.
does not illuminate.
STE/ICE-R #91.
between terminals of CEL
DDEC ECM vehicle harness
indicator lamp?
connector OK.
REASON FOR QUESTION
CEL OFF with jumperwire
installed at vehicle harness
Continuity indicates lamp is OK.
connector.
If lamp is OK, driver wire 419 or
No short in +12 volt wire 439.
ground wire 150 are open.
POSSIBLE PROBLEMS
CEL indicator lamp faulty.
Open in CEL driver wire 419.
Open in +12 volt wire 439.
Replace lamp
Short/Open in battery positive
(Para 7-24).
wires 240 or 241.
NO
Verify repair, go to
Open in ground wire 150.
Step 9 of this Fault.
Damaged DDEC ECM terminals
or connectors.
YES
2-418
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