Ford Mustang Service Manual: Pinpoint Tests

Principles of Operation

The speed control system is designed to maintain vehicle speed above 48 km/h (30 mph). After the ON switch is depressed, depressing the SET/ACCEL switch will activate the speed control servo. To increase a set speed, either depress and hold for continuous acceleration, or momentarily tap the SET/ACCEL switch for 1.6 km/h (1 mph) acceleration increments. To decrease a set speed, depress and hold the COAST switch until the target speed is reached, or momentarily tap the COAST switch for 1.6 km/h (1 mph) deceleration increments. When the speed control system has been disabled by tapping the brake pedal, the RESUME switch can be depressed and the vehicle will return to the original set speed if the vehicle is traveling over 48 km/h (30 mph) and the OFF switch has not been depressed.

NOTE: The deactivator switch is provided as an additional safety feature. Normally, when the brake pedal is depressed, an electrical signal from the brake lamp circuit to the speed control servo will deactivate the system. Under increased brake pedal effort, the deactivator switch will open and remove power to the speed control servo, releasing the throttle independent of the speed control servo.

NOTE: The air bag sliding contract provides the electrical interface between the steering column wiring and the speed control actuator switches in the steering wheel.

The inputs to the speed control servo are the:

  • vehicle speed signal.
  • speed control actuator switches.
  • brake pedal position (BPP) switch.
  • clutch pedal position (CPP) switch.
  • deactivator switch.

The output of the speed control servo is the:

  • speed control actuator cable controlling the throttle position.
    Symptom Chart
    Principles of Operation The speed control system is designed to maintain vehicle speed above 48 km/h (30 mph). After the ON switch is depressed, depressing the SET/ACCEL switch will activate the spee ...

    Actuator Cable - Speed Control
    Speed Control (Diagnosis and Testing) Refer to Wiring Diagrams Cell 31 , Speed Control for schematic and connector information. Special Tool(s) Worldwide Diagnostic System (WDS) 418-F2 ...

    Other materials:

    Module Configuration
    Module Configuration (Diagnosis and Testing) Special Tool(s) Worldwide Diagnostic System (WDS) 418-F224 New Generation STAR (NGS) Tester 418-F052 or equivalent diagnostic tool Principles of Operation Some modules must be programme ...

    Steering System (Diagnosis and Testing)
    Steering System (Description and Operation) The steering system has a typical rack-and-pinion design consisting of the following: Steering System Components - 3.8L Engine (CII Power Steering Pump)   Steering System Components - 4.6L Engine (CIII Pow ...

    Removal
    Removal CAUTION: Suspension fasteners are critical parts because they affect performance of vital components and systems and their failure can result in major service expense. A new part with the same part number must be installed if installation becomes nec ...