CEL - FIRST CHART FOR DIAGNOSIS OF DDEC III/IV WHEN NO DDR IS AVAILABLE

TM 9-2320-364-20-1

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

Section IV. TROUBLESHOOTING CHARTS (Cont.)

C. CEL - FIRST CHART FOR DIAGNOSIS OF DDEC III/IV WHEN NO DDR IS AVAILABLE

NOTE: Although this section will help you get started, later sections of the Troubleshooting Guide may require using a

DDR.

STEP/SEQUENCE

RESULT

WHAT TO DO NEXT

CEL-1

Note "Check Engine"

Light

Turn ignition on while at the same

Light comes on

Go to CEL-2.

time observing the "Check

and stays on.

Engine" light.

Light comes on for up to

Go to CEL-2.

5 seconds, then goes out.

Light is off.

Go to Chart 4, page 2-579.

Flashing light.

Go to CEL-8.

CEL-2

Read Codes

Turn ignition on.

Flashes out codes.

Go to CEL-3.

Depress and hold the diagnostic

request switch.

"Check Engine"

Go to Chart 6, page 2-589.

light is always on but

doesn't flash out codes.

"Check Engine"

Go to CEL-6.

light never comes on.

CEL-3

Follow Codes

Note and record code(s).

Flash Codes 14, 15,

Follow appropriate diagnostic

23, 44, or 85.

charts for the code(s) received.

(See Table 2-19.)

Any flash codes except

Go to CEL-4.

14, 15, 23, 44, or 85.

Flash code 25 --

If drive complaint persists, go to

(No codes.)

Chart 1, page 2-554.

2-549