STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
D. CHART 23 - THROTTLE INHIBIT 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 23-1
Check Configuration
Turn ignition on.
Not configured for
Reconfigure ECM to enable
Plug in DDR.
throttle inhibit.
throttle inhibit.
Select ECM in/out configuration.
Determine which cavity/wire
Data obtained.
Go to C 23-2.
throttle inhibit is assigned.
C 23-2
Check Switch Status
Determine where OEM supplied
switch/relay is what operates
Switch reads
An open exists in the wire
this function.
off.
assigned to throttle inhibit.
Using a jumper
Go to C 23-30.
wire, place between assigned
wire and battery ground.
Switch reads
The OEM supplied
Observe switch status on DDR.
on.
switch/relay is bad or a poor
ground exists. Replace/repair
then go to C 23-30.
C 23-30
Verify Repairs
Start engine.
No throttle.
Repairs complete.
Attempt to throttle engine using
foot pedal. When in a condition
Throttles ok.
Review this section from the
it shouldn't be eg. bus door
beginning to find the error.
open.
Change 3 3-345.165
