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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 connector.
VISUAL INSPECTION
(1) Loosen screw and disconnect vehicle
harness connector MC18 at
DDEC ECM.
(2) Inspect terminals and connectors
(DDEC ECM and harness side) at
vehicle harness for damage; bent,
corroded and unseated pins
or terminals.
(a) If vehicle harness connector is
damaged,repair connector
(Para 7-101).
(b) If DDEC ECM connector is
damaged, replace DDEC ECM
(Para 7-56).
(c) If vehicle harness connector and
if DDEC ECM connectors are OK,
replace DDEC ECM (Para 7-56).
RESISTANCE TEST
(1) Remove ten screws and sunshield
from instrument panel.
(2) Pull top of instrument panel towards
steering wheel.
(3) Disconnect vernier control harness
connector MC38.
(4) Place jumperwire between
terminals A and B at vernier control
harness connector MC38.
(5) Are there 5 ohms or less present
between wires 510 and 952 at
vehicle harness connector MC18,
terminals D1 and C3?
(a) If more than 5 ohms are present,
remove jumperwire and repair
wires 510 and/or 952 (see
schematic Fig 2-1) or notify DS
Maintenance.
(b) If less than 5 ohms are present,
go to Step 6 of this Fault.
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