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TM 9-2320-360-20-1
NOTE
The following flow chart should only
be used if DDEC troubleshooting was
started on p. 2-80 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.
CONTINUITY TEST
(1)
Turn ENGINE switch OFF.
(2)
Disconnect vehicle harness at
ECM connector.
(3)
Read resistance between socket
A1 of vehicle harness connector
and a good ground.
Check terminals and connectors (both ECM
and harness side) for damage, bent,
corroded, or unseated pins or sockets,
especially terminal A1 (Ckt #508).
2-349
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