Detroit Diesel 60 Series Operator's Manual page 22

On engines equipped with Jacobs
Engine Brakes, the Jake Brakes are
enabled by an "On/Off" switch mounted
on the dash. A separate intensity switch
is used to select low, medium, or high
braking power. The engine brake will
only operate when the foot pedal is fully
released. Disengaging the clutch will
prevent the engine brakes from operat-
ing, also.
Jake Brakes will supply braking
power even when in cruise control. The
electronic control module will control the
amount of engine brake with respect to
the cruise control set speed. The maxi-
mum amount of braking (low, medium,
high) is selected with the dash switches.
Data Recording Capability
Standard in all DDEC IV engines is a Data
Recording capability called DDEC
Reports. DDEC Reports contain informa-
tion on driver activities, engine perfor-
mance and critical incidents reporting. This
information is also available in DDEC III,
but must be activated by Detroit Diesel
Corporation at the request of the cus-
tomer. The information in both DDEC III
and IV can be extracted with Detroit Diesel
Diagnostic Link 2.0 (DDDL 2.0) software.
DDEC III information only may be extract-
ed with ProManager 2.0 software. To per-
form the extraction at least a 486
computer with 16 MB RAM is required.
DDEC III/IV Operation
Since the DDEC system is electronic, a
battery is required to operate the comput-
er. The system operates at 12 or 24 volts.
However, in the event of a power supply
malfunction, the system will continue to
operate at reduced voltage. When this
occurs the "Check Engine" light will come
on. See Figure 8. The engine will only
operate at reduced rpm until the battery
voltage reaches a point where the ECM I
will no longer function and the engine
shuts down.
STOP ENGINE CHECK
OVERRIDE
DIAGNOSTIC
SWITCH ENGINE
Figure 8. Typical Shut-Down Override
Switch and Engine Lights
Should the "Check Engine" light come
on for any reason, the vehicle can still be
operated and you can proceed to your
destination. This condition should be
reported to a DDEC technician as soon
as possible.
NOTICE:
When the "Stop Engine" light comes
on, the computer has detected a major
malfunction in the engine that requires
immediate attention. It is the operator's
responsibility to shut down the engine
to avoid serious damage.
The engine can be configured to give a
warning only, to ramp down (reduce
power), or to shut down. Ramp down will
reduce engine rpm to a predetermined
speed, but will not shut down the engine.
With the 30 second shutdown option the
engine will begin a 30 second, stepped,
power-down sequence until it shuts down
completely. A "Stop Engine Override" can
be supplied in case the vehicle is to oper-
ate in a critical situation.
NOTE:
The "Stop Engine Override" and
"Diagnostic Request" switch is the
same.
12
STOP
ENGINE