Symptom Chart

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM

Condition	Possible Sources	Action
The speed control is inoperative	Circuitry Speed control switches Powertrain control module (PCM)	GO to PINPOINT TEST A .
The speed control indicator lamp is never/always on	Circuitry Powertrain control module (PCM) Instrument cluster	REFER to INSTRUMENT CLUSTER .
The set speed fluctuates	Circuitry Powertrain control module (PCM) Output shaft speed (OSS) sensor	REFER to the INTRODUCTION -- GASOLINE MODELS article to continue diagnosis of the OSS sensor.