Ford Ranger Owner's Manual page 94

Press SET ACCEL switch and release it immediately. This
3.
will set your speed. If you keep this switch pressed, your
speed will continue to increase and will not be set until the
switch is released.
Take your foot off the accelerator pedal. Your vehicle will
4.
maintain the speed you set.
If you drive up or down a steep hill, your vehicle may
momentarily slow down or speed up, even though the speed
control is on. This is normal.
NOTE: If your vehicle is equipped with an automatic
transmission, and if your speed increases above your
set speed while driving in j (Overdrive) on a
downhill grade, you may want to shift to D (Drive) to
reduce vehicle speed. This can be accomplished by
pushing in the Transmission Control switch which is
located on the end of the gearshift lever. The speed
control cannot reduce the vehicle speed if it goes
above your set speed on a downhill grade. For the
best fuel economy during normal driving conditions,
leave the shift select in j (Overdrive), or resume as
soon as practical.
NOTE: If your vehicle is equipped with a 5 speed manual
transmission, and if your speed increases above your
set speed while driving in 5 (Fifth) gear on a downhill
grade, you may want to shift to 4 (Fourth) gear to
reduce vehicle speed. Depressing the clutch pedal
cancels speed control, therefore speed control must be
reset by pressing the SET ACCEL or RESUME
switches. Speed control cannot reduce the vehicle
speed if it goes above your set speed on a downhill
grade.
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