CHART - 1 - INTERMITTENT CODE OR A SYMPTOM AND NO CODES

TM 9-2320-364-20-1

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

Section IV. TROUBLESHOOTING CHARTS (Cont.)

D. CHART - 1 - INTERMITTENT CODE OR A SYMPTOM AND NO CODES

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, page 2-539, and you have now been referred here.

STEP/SEQUENCE

RESULT

WHAT TO DO NEXT

C 1-1

Diagnosis by Symptom

Turn ignition off.

Intermittent

Go to Chart 1, page 2-554.

code.

Go to appropriate result in the

next column based on engine

Engine cranks

Go to Chart 2, page 2-557.

symptom.

but will not start.

Erratic performance

Go to Chart 3, page 2-577.

and No Codes.

No "Check Engine"

Go to Chart 4, page 2-579.

light during bulb

check.

"Check Engine"

Go to Chart 5, page 2-585.

light always on and

No Codes.

"Check Gauges"

Go to Chart 6, page 2-589.

light always on,

and No Codes.

No data to

Go to Chart 7, page 2-593.

DDR.

No "Check Gauges"

Go to Chart 8, page 2-599.

light during bulb check.

Diagnostic request

Go to Chart 9, page 2-605.

switch inoperative.

Vernier Control (VSG)

Go to Chart 10, page 2-609.

inoperative.

2-554