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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE:
57
J1587 CODE:
S249 12 - J 1922 DATA LINK FAULT
NOTE - This chart is only to be used if:
1) All basic mechanical checks and physical inspections have been performed with no problem found, and
2) Diagnosis of DDEC-III was started at step START-1, pg H-25 and you have now been referred here.
STEP/SEQUENCE
57-1
Multiple code check
l Were there any
codes beside 249/12?
RESULT
I
WHAT TO DO NEXT
Yes.
No.
57-2
Check for open
l Turn ignition off.
l Unplug the 6-pin
communications
connector.
Greater than
5 ohms.
l Place a jumper wire
Less than
across pins.
5 ohms.
A (#800) and B (#801)
l Locate other ends of wire #800 and
#801. Measure resistance
between wires.
57-3
Check for short
l Remove jumper wire.
l Read resistance between
pin A (#800) and B (#801) of the
communications connector.
Less than 5 ohms.
The two data wires are
shorted together repair short
and go to 57-30.
Greater than 5 ohms.
57-30 Verify repairs
l Turn ignition off.
l Reconnect all connections.
l Turn ignition on.
l Clear codes.
l Start and run engine
(TM 9-2320-360-10) for 1 minute.
l Note status of
“Check Engine” light.
l Check for codes.
No codes
Codes appears.
Service other codes
first.
Go to 57-2.
One or both data lines are open.
Repair open.
Go to 57-30.
Go to 57-3.
Replace ECM (7-29.1). Then go
to 57-30.
Repairs are complete.
Go to START-1, pg H-25.
All diagnostics are complete.
Review to find the error.
H-229
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