P1683

Tests 1 - 5:

Tests 6 - 10:

Tests 11 - 15:

Test 16:

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

TEST NOTE
This symptom is diagnosed using the test P1595 SPEED CONTROL SOLENOID CIRCUITS.

WHEN MONITORED
Speed control on, vehicle speed > 25 mph, RPM < 5440, brake not applied. For an automatic transmission, in drive mode. For a manual transmission, the clutch not depressed.

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

POSSIBLE CAUSES
- S/C brake switch output circuit open
- S/C brake switch output circuit shorted to ground
- S/C vacuum solenoid control circuit open
- S/C vent solenoid control circuit open
- Speed control power supply circuit open
- Speed control servo ground circuit open
- Brake switch defective
- Speed control servo defective
- PCM defective (SC solenoid circuit)
- PCM defective (speed control P/S circuit)
- Brake switch needs to be adjusted