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:

    Air Intake Scoop
    Removal and Installation 1. Disconnect the air intake scoop outlet from the air cleaner. 2. Disconnect the air intake scoop water drain hoses. 3. Remove the air intake scoop from the air intake scoop bracket. Remove the two air intake scoop bolts. L ...

    Exceptions To Normal Schedule
    Yellow Coolant Change coolant at 5 years or 160,000 km (100,000 miles) of the vehicle's life, whichever comes first. After the initial change, change coolant every 3 years or 80,000 km (50,000 miles) thereafter. Natural Gas and Propane Vehicles Insp ...

    Transporting the vehicle
    If you need to have your vehicle towed, contact a professional towing service or, if you are a member of a roadside assistance program, your roadside assistance service provider. We recommend the use of a wheel lift and dollies or flatbed equipment to tow yo ...