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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:
76
J1587 CODE:
P121 0 - ENGINE OVERSPEED WITH ENGINE BRAKE
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.
76-1
Code Information
This code is for information purposes only. It is logged whenever the engine has been operating over 2500 rpm for at least
2 seconds with engine brake operation. To get complete information, do the following.
Turn ignition on.
Plug in DDR.
Select INACTIVE CODES.
At least part of the display will look like the following example:
First Occurrence
Last Occurrence
Total Number
Total Time
(For some) Min/Max Value that caused the code to be logged.

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