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:

    Lamp Assembly - Headlamp
    Removal 1. NOTE: Make sure that the headlamp switch and the ignition switch are in the OFF position. Raise the headlamp retainers. 2. Remove the headlamp assembly. Disconnect the electrical connectors and replace the lamp if necessary. Instal ...

    Idle Air Control (IAC) Valve - Cobra
    Removal and Installation 1. Disconnect the idle air control (IAC) valve electrical connector. 2. Remove the bolts, the IAC valve and the gasket. 3. NOTE: Install a new gasket if necessary. To install, reverse the removal procedure. ...

    Idle Air Control (IAC) Valve - 3.8L
    Removal 1. Disconnect the battery ground cable. For additional information, refer to Section. 2. NOTE: Discard the idle air control (IAC) valve gasket. Remove the IAC valve. Disconnect the connector. Remove the two bolts, the IAC valve and ...