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 TM 9-2320-364-20-1
Allow engine to cool before performing
troubleshooting maintenance. If necessary
use insulated pads and gloves. Hot engine
components will burn and cause injury to
personnel.
Remove all jewelry such as rings, dog
tags, bracelets, etc. If jewelry or tools
contact positive electrical circuits, a direct
short may result. Damage to equipment,
injury or death to personnel may occur.
DDR TEST
(1) If referred here from Step 1, keep
engine running.
(2) Connect DDR to DDL
connector MC13.
(3) Select MODE 05 (DDEC ECM
VOLTAGE) on DDR.
(4) Observe DDEC ECM voltage reading
on DDR.
(a) If there are more than 10 vdc
present, turn OFF ENGINE switch
(TM 9-2320-364-10) and go to
Step 4 of this Fault.
(b) If there are less than 10 vdc
present, turn OFF ENGINE switch
and go to Step 3 of this Fault.
VISUAL INSPECTION
(1) Remove two screws and heat shield
from DDEC ECM.
(2) Disconnect power harness connector
MC17 from DDEC ECM with
connector remover.
(3) Check terminals at the DDEC ECM
power harness connector (DDEC
ECM and harness side) for damage;
bent, corroded and unseated pins or
terminals.
(a) If power harness connector MC17
is damaged, repair connector
(Para 7-101) and perform Steps (4)
and (5) below.
(b) If DDEC ECM power harness
connector is damaged,
replace DDEC ECM (Para 7-56).
(c) If DDEC harness and ECM
connectors are OK, replace
DDEC ECM (Para 7-56).
(4) Connect power harness connector
MC17.
(5) Install heat shield and two screws on
DDEC ECM.
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