Section 01: ENGINE
PA1553
8
NOTE
Cruise control system will not accept speed
settings, nor will the "Resume" switch operate
below 20 mph (32 km/h) and the engine speed
must be above 1100 RPM.
3. Resume: Each time this switch is actuated,
the speed will be increased by 2 mph (3,5
km/h). This switch allows the driver return to
the last regulated speed following a brake or
"DECEL" switch application.
NOTE
On-off switch must be in the "ON" position in
order to return to the last regulated speed.
4. Decel: Will cancel the cruise temporarily and
let the vehicle coast. Set speed is still in
memory for resume.
For additional information, refer to the "Owner's
Manual".
3.4 DIAGNOSTIC SYSTEM ACCESSORIES
(DSA)
The DDEC V engine Diagnostic System
Accessories includes the following:
o Check Engine telltale light;
o Stop Engine telltale light;
o Stop Engine Override switch;
o Diagnostic Data Link (DDL) connectors.
3.4.1 Check Engine Telltale Light
The Check Engine telltale, mounted on the
telltale light panel indicates that a problem has
been detected and that a code has been stored
in the ECM memory. This light also has a 5-
second bulb check when the ignition is first
turned on. The Check Engine telltale illuminates
when the temperature at coolant sensors
exceeds 217°F (103°C) and the temperature at
oil sensors exceeds 260°F (127°C). When
sensors reach those temperatures, DDEC starts
to decrease engine power linearly.
3.4.2 Stop Engine Telltale Light
This light, also mounted on the telltale light
panel, illuminates to indicate that a major engine
problem is occurring (with the exception of a 5-
second bulb check when the ignition is first
turned on). The Stop Engine Light illuminates
when the temperature at coolant sensors
exceeds 222°F (106°C) and the temperature at
oil sensors exceeds 239°F (115°C). When
sensors detect such temperatures, DDEC shuts
the engine down after a 30 seconds grace
period. This 30-second delay may be extended
another 30 seconds (if absolutely necessary) by
using the STOP ENGINE OVERRIDE switch.
NOTE
Once engine is stopped, it can not be restarted
until the malfunction is corrected.
3.4.3 Stop Engine Override Switch
This switch, mounted on the dashboard, may be
used to extend the 30-second delay period
before engine shutdown when the Stop engine
telltale light is illuminated. This switch can be
repeatedly depressed in order to move the
vehicle out of traffic.
NOTE
The stop engine override switch will be
operative only if it has been depressed before
the end of the 30 second delay period.
CAUTION
The OVERRIDE switch must be used only in
emergency cases, such as to move the vehicle
out of traffic. Excessive use of this switch can
cause serious damage to the engine.
This switch is also used for DDEC diagnostic
code requests. Press this switch with the engine
at idle or off but with the ignition in the "ON"
position and active codes will be flashed on the
CHECK ENGINE and STOP ENGINE telltale
lights alternately. Refer to “DDEC V
DIAGNOSTIC CODES” in this section for more
information.
3.4.4 Diagnostic Data Link (DDL) Connectors
A connector is mounted on the L.H. footwell
wall. Another connector is located in the rear
electric compartment. They allow the connection
of the Diagnostic Data Reader (DDR) to read
the codes or to access pertinent data on the
condition of the engine. This enables a more
complete analysis of any defect found in the
DDEC system operation. For more information,
see Detroit Diesel Troubleshooting Guide.
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