P1595 Speed Control Solenoid Circuits

SYMPTOM
P-1595 SPEED CTRL SOLENOID CIRCUITS

WHEN MONITORED
With the ignition key on, speed control switched on, and the SET switch pressed, vehicle in drive gear moving above 25 mph.

SET CONDITION
The powertrain control module actuates the vacuum and vent solenoids, but they do not respond.

POSSIBLE CAUSES
- Ground circuit open
- S/C brake switch output circuit open
- S/C power supply circuit open
- Switched S/C power supply circuit shorted to ground
- S/C servo defective (12v driver circuit)
- S/C vacuum solenoid control circuit open
- S/C vacuum solenoid control ckt short to ground
- S/C vent solenoid control circuit open
- S/C vent solenoid control ckt short to ground
- S/C wiring harness intermittent defect (S/C VAC SOL AC)
- S/C wiring harness observable defect
- Brake switch defective
- Brake switch out of adjustment
- PCM defective (12v driver circuit)