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TM 9-2320-364-20-1
Allow engine to cool before performing trouble-shooting 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.
Use jumperwire only between terminals indicated. Failure to comply may result in damage to DDEC
components or wiring.
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 120
and 452 at engine harness connector
terminals R2 and Y2.
(a) If 5 ohms or more are present,
remove jumperwire and repair
wires 120 and/or 452 (see
schematic Fig 2-2) or notify DS
Maintenance.
(b) If 5 ohms or less are present,
connect OTS harness connector
and go to Step 5 of this Fault.
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 harness connector is damaged,
repair connector (Para 7-101) and
perform Steps (2) through (4)
below.
(b) If DDEC ECM connector is
damaged, replace DDEC ECM
(Para 7-56).
(c) DDEC harness and ECM
connectors are OK, replace
DDEC ECM (Para 7-56).
(2) Connect engine harness connector
to DDEC ECM and tighten screw.
(3) Install engine access panel with
22 washers, lockwashers and screws.
(4) Close top engine access cover.

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