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HOMESERVICE MANUALSFORD2010MUSTANG BASE, 2D COUPE, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 273 (CRUISE CONTROL SYSTEM)DIAGNOSIS AND TESTINGSPEED CONTROLPRINCIPLES OF OPERATION
2010 Ford Mustang Base, 2D Coupe, Automatic

Principles of Operation

2010 Ford Mustang Base, 2D Coupe, AutomaticSECTION Principles of Operation
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

The speed control system is controlled by the powertrain control module (PCM). The speed control system is designed to maintain a selected vehicle speed between 48 and 200 km/h (30 and 124 mph). The speed control system is controlled by the steering wheel mounted switch(es) (ON, OFF, SET/ACCEL, COAST, RESUME), and the brake pedal switches (stoplamp and speed control deactivator switches). The steering wheel mounted switch(es) are hardwired to the PCM through the clockspring.

The speed control functions include:

  • turning on the speed control system.
  • setting and maintaining the desired vehicle speed.
  • accelerating the vehicle to a higher speed.
  • decelerating down to a lower speed.
  • tapping-up/tapping-down the vehicle speed.
  • resuming the prior vehicle speed.
  • turning off the vehicle speed control system.

Pressing and releasing the ON switch turns the speed control system on. Pressing and releasing the SET/ACCEL or COAST switch while the vehicle is traveling at the desired speed activates the speed control system.

Tapping the SET/ACCEL or the COAST switch while in the set mode respectively, increases or decreases the maintained vehicle speed by 1.6 km/h (1 mph) per tap. If the respective button is pressed and held, the vehicle speed continues to accelerate or decelerate until the button is released.

Pressing and releasing the OFF switch, or turning the ignition switch to the OFF position, turns the speed control system off. Pressing the brake pedal puts the speed control system into the STANDBY mode. Pressing the RESUME button, when the speed control system is in the STANDBY mode causes the vehicle to accelerate to the last set speed. Resume does not function if the OFF button is pressed, the ignition switch is in the OFF position, or if the current vehicle speed is below the minimum operational speed.

Whenever the speed control system is engaged and active, a speed control icon on the instrument cluster is illuminated.

NOTE: The speed control deactivator switch is provided as an additional safety feature. Normally, when the brake pedal is applied, an electrical signal is sent from the stoplamp circuit to the PCM to release the throttle. Under increased brake pedal effort, the speed control deactivator switch opens and removes the voltage signal from the PCM input circuit, deactivating the speed control system.
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