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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.
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.
VISUAL INSPECTION
(1) Loosen screw and disconnect engine
harness connector at DDEC ECM.
(2) Check engine harness connector and
ECM connector for bent, corroded
and unseated terminals.
(a) If harness connector is damaged,
repair connector (Para 7-101).
(b) If DDEC ECM connector is
damaged, replace DDEC ECM
(Para 7-56).
(c) If engine harness and ECM
connectors are OK, replace
DDEC ECM (Para 7-56).
(1) Loosen screw and disconnect engine
harness connector at DDEC ECM.
(2) Place jumperwire between terminals
A and C of any sensor harness
connector that measured less than 4.7
vdc in Steps 2 and 3 of this Fault.
(3) Place jumperwire between terminals
A and B of any sensor harness
connector that measured less than 4.7
vdc in Steps 2 and 3 of this Fault.
(4) Set multimeter select switch to ohms.
(5) Are there 5 ohms or less present
between wires wire 416 and 452 at
engine harness connector, terminals
W1 and Y2?
(a) If more than 5 ohms are present,
remove jumperwire and repair
wires 416 and 452 (see schematic
Fig 2-2) or notify DS Maintenance.
(b) If less than 5 ohms are present,
wire 416 and 452 are OK.
(6) Remove jumperwire.
(7) Install engine harness connector
and tighten screw.

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