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:

    Differential Housing Cover
    Removal 1. Raise and support the vehicle. 2. NOTE: Empty the lubricant into a clean container for reuse. Remove the differential housing cover (4033). 1. Remove the 10 bolts and drain the lubricant from the differential housing (4010). 2. Remove the d ...

    Installation
    1. Install the RH engine insulator. Install the nuts. Install the bolts. 2. Install the LH engine insulator. 3. Connect the engine ground strap. 4. Install the bracket. 5. Lower the vehicle. 6. Lower the engine. 7. Raise the vehicle. 8. Ins ...

    Symptom Chart
    Condition Possible Sources Action Traction-Lok does not work in snow, mud or on ice Differential. CARRY OUT the Traction- Lok Differential Operation Check in this section. REPAIR as necessar ...