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Home >> Ford >> 2003 >> Thunderbird >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Vehicle Speed Control >> Diagnosis And Testing >> Speed Control >> Symptom Chart
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Symptom Chart

SYMPTOM CHART

Condition Possible Sources Action
No communication with the powertrain control module (PCM)
  • Battery junction box (BJB) fuse(s):
    • 31 (40A)
    • 2 (5A).
  • Circuitry.
  • PCM.
 REFER to MODULE COMMUNICATIONS NETWORK .
The speed control is inoperative
  • Clockspring.
  • Circuitry.
  • Powertrain control module (PCM).
  • Speed control switch.
 Go To PINPOINT TEST A .
The speed control switch is inoperative
  • Powertrain control module (PCM).
  • Speed control switch.
 Go To PINPOINT TEST B .
The speed control indicator lamp is always on
  • Circuitry.
  • Instrument cluster.
  • Powertrain control module (PCM).
 REFER to INFORMATION, GAUGES & WARNING DEVICES .
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