P1595 Speed Control Solenoid Circuits

SYMPTOM
P-1595 SPEED CONTROL SOLENOIDS CIRCUITS

WHEN MONITORED
With the ignition key on, speed control switched on, and the SET switch pressed, vehicle in drive gear moving above 35 mph.

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

POSSIBLE CAUSES
- Speed control brake switch output circuit open
- Speed control brake switch output circuit short to ground
- Speed control ground circuit open
- Speed control power supply circuit open
- Speed control servo defective
- Brake switch defective
- Brake switch out of adjustment
- S/C vacuum solenoid control ckt short ground
- S/C vent solenoid control circuit short ground
- Speed control vacuum solenoid control circuit open
- Speed control vent solenoid control circuit open
- Speed control wiring harn inter defect (S/C vent)
- Powertrain control module defective
- Speed control wiring harness observable defect
- Speed control wiring harn inter defect (S/C vacuum)