Checking Speed Control Operation

SYMPTOM
* CHECKING SPEED CONTROL OPERATION

POSSIBLE CAUSES
- Ground circuit open
- S/C brake switch output circuit shorted to ground
- S/C power supply circuit (PCM to brk switch) open
- Cancel switch defective
- Set/resume switch defective
- Brake switch defective
- Brake switch out of adjustment
- Brake switch connector observable defect
- PCM (speed control) defective
- S/C servo connector terminal observable defect
- Vacuum reservoir defective
- Vacuum supply leak or restriction