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TM 9-2320-360-20-1
NOTE
·
Vehicle
troubleshooting
must
be
performed first, before attempting to use
this chart.
·
The following flow chart should only be
used
if
DDEC
troubleshooting
was
started on p. 2-82 and you were referred
here.
(1)
Start engine (TM 9-2320-360-10) and run at
idle.
(2)
Plug in DDR and select MISC OUTPUTS.
(3)
Observe DDR display labeled ENG BRK
ENABLE.
(4)
If display reads OFF, ECM Is programmed for
engine brake control, If display reads ON, ECM
programmed for transmission retarder control.
(1)
Rev up the engine, then quickly take foot
off throttle.
NOTE
DDR should read OFF
when engine Is started
and while increasing or
holding throttle. When
throttle Is released,
display should change to
ON When engine
returns to idle, DDR
should read OFF.
(2)
Observe DDR display line labeled ENG
BRK ENBLE.
Check terminals and connectors at vehicle harness
connector (both ECM and harness side) for damage, bent,
corroded, or unseated pins or sockets, especially terminal
A1 (Ckt #508).
2-353
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