Symptom Chart

Condition	Possible Sources	Action
The speed control is inoperative	Circuitry Powertrain control module (PCM) not configured for speed control Speed control switch Digital transmission range (TR) sensor Vehicle speed signal PCM	Go to Pinpoint Test A .
The speed control indicator lamp is never/always on	Circuitry PCM Instrument cluster	REFER to INSTRUMENT CLUSTER article.
The set speed fluctuates	Circuitry PCM Output shaft speed (OSS) sensor	REFER to the Introduction - Gasoline Engines article.