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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).
5.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
CHECK ENGINE light (CEL)
Voltage test.
on Page 2-421
does not illuminate.
STE/ICE-R #89.
DDEC ECM vehicle harness
connector OK.
REASON FOR QUESTION
Are there 10 to 14 vdc
CEL OFF with jumperwire
measured between wire 439 at
installed at vehicle harness
Less than 10 volts at vehicle
connector.
harness connector indicates
vehicle harness connector
No short in +12 volt line
wire 439 (+12 volt line) is open.
MC18, terminal B3 and a
wire 439.
known good ground?
CEL indicator lamp OK.
No open in CEL driver wire 419.
POSSIBLE PROBLEMS
Repair wire 439 (see
schematic Fig 2-1) or
Open in +12 volt wire 439.
notify DS
Short/Open in battery positive
NO
Maintenance.
wires 240 or 241.
Verify repair, go to
Open in ground wire 150.
Step 9 of this Fault.
Damaged DDEC ECM terminals
or connectors.
YES
6.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
CHECK ENGINE light (CEL)
Voltage test.
on Page 2-421
does not illuminate.
STE/ICE-R #89.
DDEC ECM vehicle harness
connector OK.
REASON FOR QUESTION
Are 10 to 14 vdc measured
CEL OFF with jumperwire
between wires 241 and 240 at
installed at vehicle harness
Less than 10 volts at power
connector.
power harness connector
harness connector indicates
No short in +12 volt line
MC17, terminals A, B, E and F
battery positive lines wires
wire 439.
240/241 are shorted
and a known good ground?
CEL indicator lamp OK.
(CB22/CB23 tripped) or open.
No open in CEL driver wire 419.
No open in +12 volt wire 439.
Repair wires 241
POSSIBLE PROBLEMS
and/or 240 (see
schematic Fig 2-3)
Short/Open in battery positive
NO
or notify DS
wires 240 or 241.
Maintenance.
Open in ground wire 150.
Verify repair, go to
Damaged DDEC ECM terminals
Step 9 of this Fault.
or connectors.
YES
2-420
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