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:

    Throttle Position (TP) Sensor
    Removal NOTE: The 3.8L engine is shown; the 4.6L (2V) is similar. 1. Disconnect the battery ground cable. For additional information, refer to Section. 2. Remove the throttle position (TP) sensor. Disconnect the connector. Remove the screws, ...

    Engine Mount
    Special Tool(s) Support Bracket, Engine 303-639 3-Bar Engine Support Kit 303-F072 Alignment Tool, Subframe 502-004 ...

    Windshield Glass
    Special Tool(s) Rotunda Pneumatic Knife with Offset Blade 107-R1511 or equivalent The Pumper 164-R2459 or equivalent Rotunda Interior Auto Glass Cut-Out Knife Kit 164-R2450 or equivalent ...