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:

    Ignition Switch Lock Cylinder - Non-Functional
    Removal and Installation 1. NOTE: Make sure the front wheels are in the straight-ahead position. Disconnect the battery ground cable (14301) and wait at least one minute to allow the depletion of the restraint system backup power supply. 2. WARNING: To avo ...

    Removal
    1. Remove the nuts and position the radio ignition interference capacitors aside. 2. Remove the valve covers. For additional information, refer to Valve Cover RH and Valve Cover LH in this section. 3. Remove the cooling fan. 4. Remove the accessory drive ...

    Valve Tappets
    Material Removal CAUTION: If removing more than one valve tappet, mark the components removed for correct location. 1. Remove the lower intake manifold. For additional information, refer to Lower Intake Manifold in this section. 2. Remove the push r ...