VISUAL INSPECTION -726280477

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).

connectors are OK, replace

DDEC ECM (Para 7-56).

RESISTANCE TEST

(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.