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:

    Principles of Operation
    Evaporative Emission (EVAP) Canister Purge Valve The EVAP canister purge valve is controlled by the powertrain control module (PCM). The EVAP canister purge valve controls the flow of fuel vapors from the EVAP canister to the engine intake manifold duri ...

    Lamp Assembly - Map/Dome
    Removal 1. Disconnect the battery ground cable. 2. Remove the lamp lens from the lamp assembly. 3. Remove the lamp assembly. 1. Remove the screws. 2. Remove the lamp assembly. Disconnect the electrical connectors. Installation 1. NOTE ...

    Degas Bottle - 4.6L(2V) and 4.6L(4V)
    Removal and Installation 1. Drain the engine coolant from the degas bottle only. For additional information, refer to Cooling System Draining, Filling and Bleeding in this section. 2. Disconnect the radiator vent hose. 3. Remove the degas bottle return hos ...