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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.
(1) Loosen screw and disconnect engine
harness connector from DDEC ECM.
(2) Read resistance between wires 472
and 452 at engine harness connector,
terminals R3 and Y2.
(a) If there are more than 5 ohms
present, repair wires 472 and/or
452 (see schematic Fig 2-2) or
notify DS Maintenance.
(b) If there are 5 ohms or less
present, wires 472 and 452 are
OK.
(3) Connect engine harness connector to
DDEC ECM and tighten screw.
(4) Remove jumperwire and connect FTS
connector.
VISUAL INSPECTION
(1) Check terminals at engine harness
connector (DDEC ECM and
harness side) for damage; bent,
corroded and unseated pins or
terminals.
(a) If engine 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 engine harness connector and
DDEC ECM connectors are OK,
replace DDEC ECM (Para 7-56).
(2) Install DDEC ECM (Para 7-56).
(3) Close top engine access cover.

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