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:

    Assembly
    1. Inspect the clutch cylinder thrust surfaces, piston bore and clutch plate serrations for scores or burrs. Minor scores or burrs may be removed with crocus cloth. Install a new clutch cylinder if badly scored or damaged. 2. Check the fluid passage in the ...

    Spark Plug Wire
    Special Tool(s) Remover, Spark Plug Wire 303-106 (T74P-6666A) Material Item Specification Silicone Brake Caliper Grease and Dielectric Compound D7AZ-19A331-A or equivalent ESE-M1C171- A Removal and Installation CAUTION: ...

    Trim Panel - Package Tray
    Special Tool(s) Torx Bit, Safety Belt Bolt 501-010 (T77L-2100-A) Removal and Installation 1. Remove the screw and the coat hook. 2. NOTE: Inspect the shoulder safety belt guide cover for damage. If the shoulder safety belt guide cover is d ...