4.2
GENERAL DIAGNOSTIC INFORMATION
4.2
GENERAL DIAGNOSTIC INFORMATION
As a bulb and system check, the Check Engine Light (CEL) and Stop Engine Light (SEL) will
come on for five seconds when the ignition switch is first turned on. If the unit is programmed for
the cruise control feature, the "Cruise Active" light (if equipped) will also turn on for five seconds.
If the CEL comes on during vehicle operation, it indicates the self diagnostic system has detected
a fault.
When the diagnostic request switch is held, the diagnostic system will flash the yellow or red
light located on the dash of the vehicle. The light will be flashing the code(s) indicating the
problem areas. If the SEL comes on during vehicle operation, it indicates the DDEC System has
detected a potential engine damaging condition. The engine should be shut down immediately
and checked for the problem.
Active codes will be flashed on the SEL in numerical flash code order. If there are no active
codes, a code 25 will be flashed.
Inactive codes will be flashed on the CEL in most recent to least recent order. If there are no
inactive codes, a Code 25 will be flashed.
All information subject to change without notice.
4-4
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
