User Manual

SERIES 50 OPERATOR'S GUIDE
Figure 7 Diagnostic Data Reader
J 38500
Once the malfunction has been
corrected, the DDEC system will
return the engine to normal operation.
The DDR can distinguish between
codes now active and those stored in
the ECM memory (inactive).
The malfunction code recorded in the
computer memory will remai n until it
is erased by a technician.
The malfunction code can also be
obtained by the operator. A D iagnostic
Request switch is provided which,
when pressed, will cause the CEL
to flash a code number. It will, for
example, flashtwice...pause...
flash once. . . pause. In other words, a
code 21 . Code 21 indicates the throttle
position sensor input voltage is hig h.
See Figure 8.
NOTE:
Acode25(twoflashes followed by
5 flashes) indicates all systems are
working satisfactorily.
Figure 8 SEL/CEL Flashing Code Examples
All information subject to change without notice. (Rev. 01/04) 29
DDC-SVC-MAN-0058 Copyright © 2004 DE TROIT DIESEL CORPORATION