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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
troubleshooting 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 MC18 (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).
(c) If DDEC harness and ECM
connectors are damaged, 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 2-24).
(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
for about five seconds and then
goes off, fault has been corrected.
Perform Steps (4) and (5) below.
(b) If CHECK ENGINE light comes on
and stays on, perform Steps (4)
and (5) below and go to Fault
(4) Turn OFF ENGINE switch.
(5) Disconnect DDR from DDL connector
MC13.

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