P1683

Tests 1 - 6:

Tests 7 - 10:

Tests 11 - 15:

Tests 15 - 19:

Tests 20 - 23:

Tests 24 - 28:

Tests 29 - 33:

Tests 34 - 35:

SYMPTOM
P1683-SPEED CONTROL POWER RELAY OR S/C 12V DRIVER CIRCUIT

TEST NOTE
All symptoms listed above are diagnosed using the same tests. The title for the tests will be P1595-SPEED CONTROL SOLENOID CIRCUITS.

WHEN MONITORED
With the ignition key ON and the speed control switched ON.

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

POSSIBLE CAUSES
- S/C power supply circuit shorted to ground
- 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 short to ground
- S/C vent solenoid control circuit open
- S/C vent solenoid control circuit short to ground
- S/C wiring harness intermittent problem (S/C vacuum solenoid actuation)
- S/C wiring harness observable problem
- S/C servo (12V driver circuit)
- S/C servo (12V driver circuit)
- S/C power supply circuit open
- Brake switch
- Brake switch out of adjustment
- S/C brake switch output circuit open
- S/C brake switch output circuit shorted to ground
- PCM (12V driver circuit)