RESISTANCE TEST -726280395

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.

RESISTANCE TEST

(1) Loosen screw and disconnect engine

harness connector at DDEC ECM.

(2) Are there 100 to 200 ohms present

between wires 112 and 111 at engine

harness connector, terminals S1

and S2?

(a) If there are less than 100 ohms

present, go to Step 4 of this Fault.

(b) If there are more than 200 ohms

present, go to Step 5 of this Fault.

ohms present, go to Step 3 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 engine harness connector is

damaged, repair connector

(Para 7-101).

(b) If DDEC ECM connector

is damaged, replace DDEC ECM

(Para 7-56).

engine harness connector are OK,

replace DDEC ECM (Para 7-56).

(2) Close top engine access cover.