STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
D. CHART -10 - STOP ENGINE OVERRIDE (SEO) INOPERATIVE
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 3-345.41 and you have now been referred here
C 10-1
Check SEO Circuit
Turn ignition on.
Display reads "ON"
Go to C10-2.
Plug DDR into DDL connector
select switch/light status for display.
Display reads "OFF"
Stop Engine Override line (ckt
Press SEO button (or switch)
#528) or SEO button switch
while observing display for ST
is open and/or SEO switch does
ENG OVR SW (Stop Engine
not properly ground SEO line
Override Switch) on DDR.
when pressed. Check wiring
from ECM to SEO switch
battery ground. Repair problem.
Then go to C10-30. If no open
found, go to C10-2.
C 10-2
Check Calibration
Configuration
Select calibration configuration
Any display reads
Reprogram ECM then go to
and observe the SHUTDOWN
shutdown/ramp.
C10-30.
displays.
Stop engine feature is not
Also ensure SEO is
All displays read
selected. Refer to DDR
configured on Digital Input
Warning.
instruction manual,
Area.
(CALIBRATION CHANGES) for
information on
turning on this feature.
C 10-30
Verify Repairs
Turn ignition on.
Display reads "ON".
Repairs are complete. If any
Press SEO button (or switch)
other DDEC-related problems
while observing display for
remain, go to START-1, pg 3-345.41.
ST ENG OVR SW on DDR.
Display read "OFF".
All system diagnostics are
complete. Please review this
section from first step to find
error.
Change 3 3-345.115
