Table of Contents
Advertisement
OM3006.3 04/98
Instrument Panel and Indicators
Automatic Idle Selector Switch (AISS)
The AISS Switch (4, Figure 3-7) controls
the ''idle'' speed of the engine (released
throttle pedal). With the foot-operated
throttle pedal in the released position, the
PMC (Powertrain Management Control-
ler) sends a signal to the Centry™ Fuel Control System
for a ''low idle'' RPM.
This signal may be for either:
•
750 RPM - ''Normal'' low idle, or
• 1000 RPM - High-Low idle;
depending on the following conditions:
1. Depressing the bottom of the switch selects the
''Off/AUTO'' position which is used for normal
truck operations. When the AISS switch is in this
position, the PMC idle signal will be determined
by two conditions:
engine coolant temperature, and
brake application.
a. Engine Coolant Temperature -
If the engine coolant temperature is below
30°C/47°F, the PMC will signal for 1000 RPM,
regardless of other conditions.
If the engine coolant temperature is above
30°C/47°F, the PMC will signal for 750 RPM,
except as follows:
b. Brake Application -
If both the parking brake and service brake are
released (acceleration anticipated), the PMC
will signal for 1000 RPM, regardless of other
conditions.
2. Depressing the top of the switch selects the
''On/Low'' position.
When the AISS switch is in this position, the PMC
will signal for 750 RPM, regardless of other condi-
tions. ''On/Low position is used when fine control
movements are needed, such as when parking in
confined spaces.
Air Conditioner & Heater Vent
The air conditioner/heater vent (5, Figure 3-7) swivels
on a vertical axis to direct air toward or away from the
operator. Air flow (up, down, on, off) through the vent
is controlled by manually opening/closing or turning
the louver.
Auto Cruise Control (OPTIONAL)
The Auto Cruise Control (6, Figure 3-7), if installed,
allows the operator to electronically control the truck
travel speed.
On/Off Switch
This Switch (7, Figure 3-7) selects the On/Off status for
the Auto Cruise Control feature.
Turning the switch clockwise to the vertical position
turns the switch ''On''.
Turning the switch counter-clockwise to the diagonal
position turns the switch ''Off''.
Resume/Accel Switch
The Resume/Accel Switch (8, Figure 3-7) is a green,
back-lighted switch (power switch ''On'') that is used
to resume a previously pre-selected speed, or to accel-
erate/increase to a higher speed. Depressing and re-
leasing the switch will increase speed approximately 1
mph (0.62 kph) each time the switch is depressed.
Set/Coast Switch
The Set/Coast Switch (9, Figure 3-7) is a green, back-
lighted switch (power switch ''On'') that is used to set
the ''Cruise'' speed when a desired travel speed has
been attained.
Depressing and releasing the switch will also decrease
speed approximately 1 mph (0.62 kph) each time the
switch is depressed.
Cancel Switch
The Cancel Switch (10, Figure 3-7) is a yellow, back-
lighted switch (power switch ''On'') that is used to
cancel any speed settings which have been previously
selected.
Operation - Section 3
Page 3-25
Advertisement
Table of Contents
