Ford Mustang (1999-2004) Service Manual: Inspection and Verification

NOTE: If any concerns are noted with the speedometer, stoplamps, or horn, address those concerns by referring to their associated sections before continuing speed control diagnosis.

1. Verify the customer concern by operating the speed control system.

2. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart

Mechanical Electrical
  • Deactivator switch
  • Speed control actuator cable not attached to throttle
  • Speed control actuator cable not fully seated to the engine bracket
  • Central junction box (CJB) Fuse:
  • 15 (15A)
  • 33 (15A)
  • 35 (15A)
  •  Battery junction box (BJB) fuse:
  • HORN (20A)
  • Wiring harness
  • Loose or corroded connections
  • Speed control actuator switches

3. If the fault is not visually evident, verify the symptom and GO to the 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 speed control servo. To inc ...

    Symptom Chart
    NOTE: New speed control diagnostic software is available in Version 12 or higher for the diagnostic tool. When using this software, it is necessary to use Next Generation Speed Control Adapter 007- ...

    Other materials:

    Symptom Chart
    Condition Possible Sources Action The Brakes Pull or Drift Tire air pressure. Wheel alignment. Brake pads. Brake components. Suspension component. Go To Pinpoint Test A . ...

    Automatic transmission
    WARNING: Always set the parking brake fully and make sure the gearshift is latched in position P. Turn the ignition off and remove the key whenever you leave your vehicle. Your vehicle has been designed to improve fuel economy by reducing fuel usage while coas ...

    Locking and unlocking
    You can use the power door lock control or the remote control to lock and unlock your vehicle. Power Door Locks The power door lock control is located on the driver and front passenger door panels. A. Unlock B. Lock Remote Control You can use the remote cont ...