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:

    Differential Pressure Feedback Exhaust Gas Recirculation (EGR) System
    Removal and Installation 1. NOTE: The 4.6L (2V) is shown. The 4.6L (4V) and 3.8L are similar. NOTE: Bolts may be used in place of nuts on some applications. Remove the differential pressure feedback EGR. 1. Disconnect the connector. 2. Remove the ...

    Accessories
    For a complete listing of the accessories that are available for your vehicle, please contact an authorized dealer or visit our online store at Accessories.Ford.com (United States only). Ford Custom Accessories are available for your vehicle through an author ...

    Diagnosis By Symptom
    Special Tool(s) Transmission Fluid Pressure Gauge 307-004 (T57L-77820-A) Air Test Plate, Transmission 307-246 (T92P-7006-A) Breakout Box, EEC-V Control System 418-049 (T94L-50-EEC-V) or equivalent MLP- ...