P1683 Speed Control Power Relay CKT or 12V Driver Circuit

SYMPTOM
P-1683 SPEED CONTROL POWER RELAY/12 VOLT DRIVER

WHEN MONITORED
With the ignition key on, speed control switched on.

SET CONDITION
The speed control power supply circuit is either open or shorted to ground.

POSSIBLE CAUSES
- Brake switch defective
- S/C servo connector ground circuit open
- Speed control power supply circuit open
- Speed control servo defective
- S/C brake switch output circuit shorted to ground
- 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
- Speed control brake switch output circuit open
- PCM defective