START - FIRST CHART FOR DIAGNOSIS OF DDEC III/IV USING DDR (Cont'd) -726280613

TM 9-2320-364-20-1

Section IV. TROUBLESHOOTING CHARTS (Cont.)

C. START - FIRST CHART FOR DIAGNOSIS OF DDEC III/IV USING DDR (Cont'd)

STEP/SEQUENCE

RESULT

WHAT TO DO NEXT

START-5

Read All Codes

Again

Read inactive codes

Any codes.

Follow appropriate diagnostic

on DDR.

chart for codes received. (See

Table 2-19).

DDR display reads

Go to Chart 7, page 2-593.

"NO DATA

RECEIVED FROM

SYSTEM" or "DDEC

SYSTEM NOT

RESPONDING".

DDR display is

Go to START-9.

blank or random.

START-6

Read Codes on

the "Check

Engine" Light

Unplug the DDR.

Flashes out

To diagnose codes, follow

Ignition on.

codes.

appropriate diagnostic chart for

Engine not running.

codes received. (See Table 2-19).

Depress and hold

To diagnose DDR system, go to

diagnostic request switch.

C 7-4, page 2-595.

Read codes flashing out on the

"Check Engine" light.

Does not flash

Go to Chart 9, page 2-605.

out codes.

START-7

Intermittent

"Check Engine"

Light

Note whether flashing "Check

Flashing a

Go to START-8.

Engine" light is reading a valid

valid code.

code or if it's just erratic.

Erratic or

Go to Chart 1, page 2-554.

intermittent "Check

Engine" light.

2-543