SERIES 60 ENGINE OPERATOR'S GUIDE
High oil temperature
Low oil pressure
Auxiliary shutdown
It is important to point out that
whenever the AWL or the RSL
come on, the DDEC computer will
determine where the problem is and
will then store this information in its
memory.
If the malfunction is intermittent, the
lights will come on and go off as the
computer senses the changing engine
condition.
Diagnostic Data Reader
The Diagnostic Data Reader (DDR)
is a special diagnostic tool that can
be plugged into the engine computer
memory to extract information
related to the cause of the problem.
See Figure 8.
Figure 8
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 ECU memory (inactive).
The temperature of air in the intake
system is increased with the addition
of an EGR. DDEC is programmed
to reduce fueling (power) for a
short time to reduce air and coolant
temperatures when necessary. DDEC
will store an information code that
this event occurred, but no corrective
action is required as this action
is designed to maintain operation
without a noticeable affect on vehicle
performance.
The malfunction code recorded in the
computer memory will remain until it
is erased by a technician.
The malfunction code can also be
obtained by the operator. A Diagnostic
Test Mode Switch is provided which,
when pressed, will cause the AWL
to flash a code number. It will, for
example, flash twice. . . pause . . .
flash once. . . pause. In other words, a
code 21. Code 21 indicates the throttle
position sensor input voltage is high.
See Figure 9.
NOTE:
A code 25 (two flashes followed by
5 flashes) indicates all systems are
working satisfactorily.
All information subject to change without notice. (Rev. 01/04)
29
6SE484
0401
Copyright © 2004 DETROIT DIESEL CORPORATION