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TM 9-2320-364-20-1
Section III. TESTING THE DDEC III/lV SYSTEM (Cont.)
c. Observe the codes flashing out on the CEL and CGL. Example: Code 13 (active) and 21 (inactive) below.
CGL
CEL
1 Flash
3 Flashes
2 Flashes
1 Flash
Short
Long
Short
Pause
Pause
Pause
1/ sec.
1/ sec.
3 sec.
2
2
Code
Code
13
21
Active
Inactive
Flashers
This will continue as long as the diagnostic request switch is held with the ignition on.
3. Using the Diagnostic Data Reader
(DDR) or PRO-LINK 9000.
Proper use of this reader is described in the instruction manual supplied. This device is infinitely more useful in
reading fault codes and diagnosing engine electronic faults than the flash code process. Section V of this paragraph
provides the information obtainable with the reader.
2-525
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