TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING
E. CODE 85 w ENGINE OVERSPEED
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-II was started at step Start-1 (page 3-121 ) and you have now been referred here.
- .
85-1 Code 85 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. To get complete information, do the following:
1)
2)
3)
Line 1 =
Line 2 =
Line 3 =
Line 4 =
Line 5 =
Turn ignition on and plug the DDR in
Select Mode 02 (Historical Codes) and 38 (Engine Hours) for display
At least part of the display will look like the following example (there W-II be more display if more
codes are logged in addition to Code 85):
85 ENG OVERSPEED 02
352 START HR 02
15 SECONDS
02
1 OCCUR
02
368 ENG HOURS 38
This is what the display means:
Line 1 =
A Code 85, engine overspeed was logged. It is being displayed as part of the Mode
02 display.
Line 2 =
The Code 85 condition was first seen at 352 engine hours (number of hours the engine
has been in use since coming off the assembly line).
Line 3 =
The total duration of Code 85 conditions logged was 15 seconds.
Line 4 =
Only 1 continuous occurance of Code 85 took place.
Line 5 =
The total number of engine hours at this time is 368 (this is the Mode 38 display).
Putting this information together with the Mode 02 display, this means that the first
Code 85 condition occured 16 engine hours ago (368- 352).
l Note that this additional audit trail information is only available for:
l Code 22 (Throttle Position Sensor Low)
l Code 43 (Low Coolant)
l Code 44 (Engine Over emperature)
l Code 45 (Low Oil Pressure)
l Code 85 (Engine Overspeed)
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