Volvo VNL Operator's Manual page 266

Low Idle Adjustment
If the engine coolant temperature is above
122 F (50 C), the vehicle is stationary (en-
gine running; accelerator released; parking
brake on) and the PTO is not engaged, the
engine low idle speed can be adjusted with
the use of the cruise control function.
1 Set the cruise control switch to the
ON position.
2 Depress the foot brake pedal. Hold it
down during the entire procedure.
3 Move the cruise control switch to the
RESUME position and hold it there
for four seconds. Release the switch.
The engine speed will drop to the de-
fault low idle.
4 The idle speed is adjusted up with the
SET+ switch. Each time the SET+
switch is pressed momentarily, idle
speed will increase approx. 10 r/min
(the speed cannot be increased above
the maximum allowed by the engine
manufacturer).
5 The idle speed is adjusted down with
the SET- switch. Each time the SET-
switch is pressed momentarily, the idle
speed will decrease approx. 10 r/min.
(the speed cannot be adjusted below
the low idle set by the engine manu-
facturer). By continuously pressing the
switch, engine speed will ramp up
(SET+) or down (SET-).
6 When the desired engine idle speed is
reached, push and hold the SET and
move the cruise control switch to the
RESUME position at the same time
and hold them in position for four sec-
onds. Release the switches.
7 Release the brake pedal to set the new
idle speed. If an error was made dur-
ing the adjustment procedure, the
default idle speed will be maintained.
Engine Start and Operation
Before setting the idle, apply the parking
brakes and place the transmission in
neutral. Failure to do so can result in un-
expected vehicle movement and can
cause personal injury or death.
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