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:

    Cooler - Fluid
    Removal 1. Raise and support the vehicle. 2. Disconnect the power steering hoses. 3. Remove the bolt and routing bracket. 4. Remove the bolts and the power steering fluid cooler. Installation 1. To install, reverse the removal procedure. 2. Fill and ...

    Pinpoint Tests
    NOTE: Reinstall or install new evaporative emission hose clamps removed or damaged during testing procedures. PINPOINT TEST A: DTC P0442 SMALL LEAK IN EVAP SYSTEM Test Step Result / Action to Take NOTE: Condition P0442 DTC set: less than 0.62 ...

    Ignition Switch
    Removal 1. Disconnect the battery ground cable. 2. Remove the lower instrument panel steering column cover. 1. Remove the screws. 2. Remove the lower instrument panel steering column cover. 3. Remove the instrument panel reinforcement. 1. Rem ...