Section 4
TROUBLESHOOTING CHARTS
E. CODE 6X (X=1 to 6) - INJECTOR RESPONSE TIME TOO LONG
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-II was started at step Start-1 (page 3-121) and you have now been referred here.
TM 9-2320-363-20-1
6X.1 Non 6X Code Check
l Were there any other codes besides
Code 6X?
6X.2 Confirm Failure
l Start and warm engine cooperating
temperature (at least 86’).
l Plug in DDR and select INJ RESP
TIMES (Mode 10).
l The DDR displays injector response
time in firing order. Read the
injector response times thru
several cycles. The firing
sequence in relation to the code
received is given in Table 6X-1
(page 000).
l Note response time(s) of cylinder
number(s) in fault code(s).
RESULT
Yes.
N o o t h e r c o d e s
R e s p o n s e t l m e ( s)
for code(s) received
is 0.80.
R e s p o n s e t i m e ( s)
is not 0.80
WHAT TO DO NEXT
-service other codes
before proceeding to diagnose
Code 6X.
-GO to 6X-2. (Note: in Step 6X-2,
be sure to verify the response
times of all cylinders indicated
by 6X fault codes.)
-Failure is still present.
GO tO 6X-3.
-Failure is no longer present (it’s
intermittent). If you still have a
customer complaint along with
Code 6X, look for the following
possible problems:
1
2
3
4
5
6
Sticky valve
Aeration in fuel
Low battery
Broken spring or armature
on the injejctor.
Problems in the charging
system (loose alternator
belt. etc.) or bad grounds.
Signs of insulation wear on
injection harness.
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