RESISTANCE TEST -726280481

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 personnel injury.

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.

Corrosion inhibitor contains alkali. Do not get in eyes; wear goggles/safety glasses when using. Avoid contact

with skin. In case of contact, immediately wash area with soap and water. If eyes are contacted, flush eyes

with large amounts of water for at least 15 minutes and get immediate medical attention.

ECM connector terminals are easily damaged. Use care when connecting and disconnecting connectors.

While applying torque to nut, hold screw with wrench or damage to battery may occur.

RESISTANCE TEST

(1) Remove battery box cover

(TM 9-2320-364-10).

(2) Remove nut, washer, lockwasher and

disconnect wires 240 and 241 from

battery No. 4. Discard lockwasher.

(3) Remove two screws and heat shield

from DDEC ECM.

(4) Disconnect power harness connector

MC17, right and left injector connectors

with connector remover.

(5) Loosen two screws and disconnect

engine and vehicle harness connectors

from DDEC ECM.

(6) Are there more than 10,000 ohms or an

open circuit present between wire 416 at

engine harness connector, terminal W1

and wire 439 at vehicle harness

connector MC18, terminal B3?

(a) If less than 10,000 ohms are present,

repair wires 416 and 439 (see

schematic Fig 2-1 and/or 2-2) or

notify DS Maintenance and perform

Steps (8) through (14) below.

(b) If more than 10,000 ohms are present

or an open circuit, wires 416 and 439

are OK. Perform Step (7) below.

(7) Are there more than 10,000 ohms

present between wire 416 at engine

harness connector, terminal W1 and

wires 241 and 240 at power harness

connector, terminals A, B, E and F?

(a) If less than 10,000 ohms are present,

repair wires 416, 240 or 241 (see

schematic Fig 2-2 and/or 2-3) or

notify DS Maintenance and perform

Steps (8) through (14) below.

(b) If more than 10,000 ohms are

present, DDEC wiring is OK.

(8) Connect engine and vehicle harness

connectors to DDEC ECM and tighten

two screws.

(9) Connect DDEC ECM power connector

and right and left injector connectors.

(10) Connect wires 240/241 to battery

No. 4 with washer, lockwasher and nut.

(11) Tighten nut to 23 lb-ft (31 N.m).

(12) Apply corrosion preventive compound

on nut.

(13) Install heatshield and two screws to

DDEC ECM.

(14) Install battery box cover.

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