VISUAL INSPECTION -726280545

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.

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

connectors.

VISUAL INSPECTION

(1) Loosen screw and disconnect vehicle

harness connector MC18 at

DDEC ECM.

(2) Inspect DDEC ECM terminals and

vehicle harness connector MC18

(DDEC ECM and harness side) at

vehicle harness connector

for damage; bent, corroded, or

unseated pins or terminals.

(a) If vehicle harness connector is

damaged, repair connector

(Para 7-101) and perform Steps

(3) and (4) below.

(b) If DDEC ECM connector is

damaged, replace DDEC ECM

(Para 7-56) and perform

Steps (3) and (4) below.

DDEC ECM connector are OK,

replace DDEC ECM (Para 7-56).

(3) Connect vehicle harness connector

MC18 and tighten screw.

(4) Close top engine access cover.

VERIFY REPAIR

(1) START engine (TM 9-2320-364-10).

(2) Set engine brake switch to low

position.

(3) Drive truck and allow engine brake

to apply.

(a) If engine brake does not operate,

fault not corrected. Perform

Steps (4) and (5) below and notify

DS Maintenance.

(b) If engine brake operates, fault

has been corrected.

(4) Turn OFF ENGINE switch.

(5) Disconnect DDR from DDL

connector MC13.