P1595 Speed Control Solenoid Circuits

SYMPTOM
P-1595 SPEED CONTROL SOLENOID 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
- Brake switch defective
- Ground circuit at servo connector open
- Speed control servo defective
- S/C brake switch output circuit shorted ground
- S/C vacuum solenoid control ckt short ground
- S/C vent solenoid control circuit short ground
- Speed control brake switch output circuit open
- Speed control vacuum solenoid control circuit open
- Speed control vent solenoid control circuit open
- Speed control wiring harness intermittent defect (B)
- Powertrain control module defective
- Speed control wiring harness intermittent defect (A)
- Speed control wiring harness observable defect
- Speed control power supply open