RESISTANCE TEST -726280319

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.

RESISTANCE TEST

(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).

DDEC ECM connectors are OK,

replace DDEC ECM (Para 7-56).

(2) Install DDEC ECM (Para 7-56).

(3) Close top engine access cover.