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:

    Turn Signal and Hazard Lamps
    Refer to Wiring Diagrams Cell 90 , Turn/Stop/Hazard Lamps for schematic and connector information. Special Tool(s) 73 III Automotive Meter 105-R0057 or equivalent Inspection and Verification 1. Verify the customer concern. 2. Visually ins ...

    Cable Adjustment
    1. NOTE: Make sure that the range selector lever is tight against the rearward overdrive stop. Place the transmission range selector lever in the overdrive position. 2. Raise and support the vehicle. For additional information, refer to Section. ...

    Special Testing Procedures
    The special tests are designed to aid the technician in diagnosing the hydraulic and mechanical portion of the transmission. Engine Idle Speed Check Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual for diagnosis and testing of the eng ...