Detroit Diesel 60 Series Operator's Manual page 24

The malfunction code can also be
obtained by the operator. A "Diagnostic
Request" switch is provided which,
when pressed, will cause the "Check
Engine" light (CEL) to flash a code num-
ber. It will, for example, flash twice ...
pause ... flash five times ... pause. In
other words a code 25. See Figure 10.
Code 25 indicates all systems are
working satisfactorily.
The active codes will be flashed on
the "Stop Engine" light (SEL) in the order
of most recent to least recent occur-
rence based on engine hours. If there
are no active codes, a code "25" will be
flashed.
The inactive codes will be flashed
on the "Check Engine" light (CEL) in the
order of most recent to least recent
RED = SEL
SEL—Active Codes
1 Flash 3 Flashes
Short
Pause
Code 13
NOTE: The SEL flashing gives active codes. The CEL flashing gives inactive (historic) codes.
Figure 10. SEL/CEL Examples
occurrence based on engine hours. If
there are no inactive codes, a code "25"
will be flashed.
Note that only one light will be flashing
codes at any time. When code flashing
is initiated, the active codes (or code
"25") will be flashed on the SEL. Then
the inactive codes (or code "25") will be
flashed on the CEL. When all the inac-
tive codes (or code "25") have been
flashed, the process of flashing all the
active codes followed by all the inactive
codes will repeat until the conditions for
code flashing are no longer satisfied.
The codes will continue to flash and
repeat as long as the diagnostic request
switch is held in the "On" position with
the ignition on. Other diagnostic codes
are listed in Table 1.
CEL—Inactive Codes
2 Flashes
Short
Long Pause Pause
Code 21
14
YELLOW = CEL
1 Flash