Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2001 Saturn SC1 L4-1.9L SOHC VIN 8FACTORY OEM SERVICE PROCEDURE
Cruise Control System Diagnosis
The PCM performs circuit checks on the cruise control system and can set diagnostic trouble codes if a fault is detected. The PCM monitors the stop lamp circuit, cruise control switch circuit, cruise control clutch circuit, cruise control move circuit and the cruise control direction circuit. If the PCM disabled cruise control due to a fault, DTC P1584 will set and specific information regarding which type of fault set the DTC can be viewed under the Scan tool Failure Record. After verifying a cruise control problem exists, retrieving DTCs should be the first step in diagnosing a cruise related problem.
The Scan tool can perform a special function which can simulate cruise control module rod movement. The test will move the accelerator pedal to 50% throttle and back down to idle. This function checks the ability of the PCM to control the cruise control clutch, direction and move circuits. The Scan tool can also display the cruise switch as well as the stop lamp switch (brake switch) states.
The Scan tool can perform a special function which can simulate cruise control module rod movement. The test will move the accelerator pedal to 50% throttle and back down to idle. This function checks the ability of the PCM to control the cruise control clutch, direction and move circuits. The Scan tool can also display the cruise switch as well as the stop lamp switch (brake switch) states.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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