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TM 9-2320-364-20-1
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.
Allow engine to cool before performing trouble-
shooting maintenance. If necessary use insulated
pads and gloves. Hot engine components will burn
and cause personnel injury.
DDEC ECM connector terminals are easily damaged.
Use care when connecting and disconnecting
connectors.
VISUAL INSPECTION
(1) Check terminals at vehicle harness
connector (DDEC ECM and harness
side) for damage; bent, corroded and
unseated pins or terminals.
(a) If vehicle harness connector is
damaged, repair connector (Para
7-101) and perform Steps (2) and
(3) below.
(b) If DDEC ECM connector is
damaged, replace DDEC ECM
(Para 7-56) and go to Step 9 of
this Fault.
(c) If vehicle harness and ECM
connectors are OK, replace
DDEC ECM (Para 7-56).
(2) Connect vehicle harness connector
MC18 to DDEC ECM and
tighten screw.
(3) Close top engine access cover.
VERIFY REPAIR
(1) Turn ON ENGINE switch
(TM 9-2320-364-10).
(2) Clear codes on DDR (Para 2-11).
(3) If CEL does not stay ON, start engine
and run for 8 minutes or until CEL
comes ON.
(a) If CHECK ENGINE light comes on
and stays on, perform Steps (4)
and (5) below and go to Fault
(b) If CHECK ENGINE light comes
on for about five seconds and
then goes off, fault has been
corrected.
(4) Turn OFF ENGINE switch.
(5) Disconnect DDR from DDL
connector MC13.

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