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TM-9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
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 was started at step START-1, pg H-25 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.
l Turn ignition on.
l Plug in DDR.
l Select Inactive codes.
l 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.
H-237
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