CHART - 8 - NO "CHECK GAUGES" LIGHT (CGL) DURING BULB CHECK

TM 9-2320-364-20-1

2-14. DDEC III/IV TROUBLESHOOTING (CONT).

Section IV. TROUBLESHOOTING CHARTS (Cont.)

D. CHART - 8 - NO "CHECK GAUGES" LIGHT (CGL) DURING BULB CHECK

NOTE - This chart is only to be used if:

1) All basic mechanical checks and physical inspections have been performed with no problem found; and,

2) Diagnosis of DDEC III/IV was started at step START-1, pg 2-539, and you have now been referred here.

STEP/SEQUENCE

RESULT

WHAT TO DO NEXT

C 8-1

Try to Force CGL on

Plug in DDR.

CGL is still off.

Go to C 8-2.

Turn ignition on.

Select activate outputs

CGL is on.

Go to C 8-4.

Activate CGL with DDR.

C 8-2

Check for Short

Remove jumper wire.

Less than

DDEC ignition circuit

Read voltage on vehicle harness

11.5 volts.

breaker (CB13) is blown, and/or

connector, socket B3 (red lead)

ignition line (ckt #439) is open

to a good ground (black lead).

or shorted to ground. Repair

problem. Then go to C 8-30.

Greater than

Go to C 8-3.

or equal to 11.5 volts.

C 8-3

Bulb Check

Remove CGL bulb and check

Bulb is

CGL Driver line (ckt #509) is

whether it's burned out or

okay.

open. Repair open. Then go to

otherwise damaged.

C 8-30.

Bulb is

Replace bulb (para 7-24). Then

not okay.

go to C 8-30.

2-599