START - FIRST CHART FOR DIAGNOSIS OF DDEC III/IV USING DDR (Cont'd) -726280611

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-3

Read All Codes

Using DDR

Plug DDR into DDL

Codes 52, 110, 175/3,

Follow appropriate diagnostic

connector.

174/3, or 190/0.

charts for code(s) received.

(See Table 2-19).

Read all inactive codes by

Any codes except

Go to START-4.

selecting inactive codes

52, 110, 175/3,

on DDR.

174/3, or 190/0.

No Codes.

Go to Chart 1, page 2-554.

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-4

Attempt to Make

Codes Active

*SEE NOTE BELOW*

Clear codes by selecting

Engine will

Go to Chart 2, page 2-557.

CLEAR CODES on the DDR.

not start.

Attempt to start and run

the engine (TM 9-2320-364-10).

Try to get the "Check Engine" light

"Check Engine"

Read active codes on DDR

on by:

light is on.

while light is on and follow

-- warming up the engine.

the appropriate diagnostic

-- slowly changing the RPM from

chart in Table 2-19.

idle to no load speed.

If truck is equipped with crane,

push ENGINE HIGH IDLE LATCH

switch to LATCH and release.

Run engine for 1 minute or until

"Check Engine"

Problem may be intermittent --

"Check Engine" light comes on.

light is off.

See Chart 1, page 2-554, Step

C 1-2.

"Check Engine"

Go to START-5.

flashes briefly.

*NOTE:

If a potential engine damaging Code (i.e., 100/1) exists, monitor that parameter

when running engine.

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