P1595

Tests 1 - 6:

Tests 7 - 11:

Tests 12 - 16:

Tests 17 - 21:

Tests 22 - 23:

SYMPTOM
P1595 - SPEED CONTROL SOLENOID CIRCUITS

WHEN MONITORED
With the ignition key ON, the speed control switched ON, the SET switch pressed and the 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
- Ground circuit at S/C servo connector open
- S/C wiring harness intermittent problem (S/C vent solenoid actuation)
- S/C vacuum solenoid control circuit open
- S/C vacuum solenoid control circuit shorted to ground
- S/C vent solenoid control circuit open
- S/C vent solenoid control circuit shorted to ground
- S/C wiring harness intermittent problem (S/C vacuum solenoid actuation)
- S/C wiring harness observable problem
- S/C power supply circuit open
- S/C power supply circuit shorted to ground
- S/C servo (12 volt driver circuit)
- S/C servo (12 volt driver circuit)
- Brake switch
- Brake switch out of adjustment
- S/C brake switch output circuit open
- S/C brake switch output circuit shorted to ground
- PCM (12 volt driver circuit)