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TM 9-2320-364-20-1
2-14. DDEC III/IV TROUBLESHOOTING (CONT).
Section IV. TROUBLESHOOTING CHARTS (Cont.)
E. FLASH CODE:
56
J1587 CODE:
S250 12 - J1587 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/IV was started at step START-1, pg 2-539, and you have now been referred here.
STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
56-1
Check for Codes
Plug in DDR.
No Data Received.
Go to C 7-1.
Turn ignition on.
Read codes.
Code 250/12
Go to 56-2.
only.
Any other codes
Service other
present?
codes first.
56-2
Clear Codes
Clear codes.
CEL on
Replace ECM (para 7-57).
Start and run engine
w/code 250/12.
Then go to 56-30.
(TM 9-2320-364-10) observe
CEL code.
No CEL code.
Go to 56-30.
56-30
Verify Repairs
Turn ignition off.
"Check Engine" light
Repairs are
Turn ignition on
comes on for 5 seconds
complete.
and observe "Check Engine"
and goes out.
light.
"Check Engine" light
All system diagnostics are
comes on and stays
complete. Please review this
on.
section to find the error.

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