P1595/1683 Speed Control Solenoid Circuits/Power Relay
SYMPTOM LISTP-1595 SPEED CONTROL SOLENOID CIRCUITS
P-1683 SPEED CONTROL POWER RELAY OR SIC 12V DRIVER
Test Note: All symptoms listed above are diagnosed using the same tests.
P-1595 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 solenoid but they do not respond.
P-1683 SPEED CONTROL POWER RELAY OR SIC 12V DRIVER
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 (S/C solenoid circuit)
- PCM defective (speed control P/S circuit)
- Brake switch needs to be adjusted