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TM 9-2320-360-20-3
Section 3
TESTING THE DDEC iii SYSTEM (Cont’d)
c. Observe the codes flashing out on the CEL and CGL. Example: Code 13 (active) and 21 (inactive) below.
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.
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 5 of this manual
provides the information obtainable with the reader.
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