See Figures 1, 2 and 3
Nissan refers to their cruise control as the Automatic Speed Control Device (ASCD) system. The ASCD system maintains a desired speed of the vehicle under normal driving conditions. However, steep grades up or down may cause variations in the selected speeds. The electronic cruise control system has the capability to cruise, coast, resume speed, accelerate, "tap-up" and "tap-down".
The cruise control system components include the control switches, control unit, actuator, speed sensor, vacuum pump, vacuum pump relay, vacuum switch, electrical release switches and electrical harness.
The cruise control system uses the ASCD control unit to obtain the desired operation. The controller monitors the vehicle speed and operates the vacuum pump, which controls the actuator. The actuator controls vehicle speed with a cable attached to the throttle body.
The release switches are mounted on the brake/clutch/accelerator pedal bracket. When the brake or clutch pedal is depressed, the cruise control system is electrically disengaged and the throttle is returned to the idle position. The cruise control module assembly contains a circuit which will prevent system engagement below 25 mph (40 km/h).
The use of the speed control is not recommended when driving conditions do not permit maintaining a constant speed, such as in heavy traffic or on roads that are winding, icy, snow covered or slippery.