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.
2000 Cadillac CateraFACTORY OEM SERVICE PROCEDURE
Automatic Level Control (ALC) Diagnostic System Check
- Ensure battery condition, cold cranking amperage and reserve capacity meet specifications. Replace as necessary. Install scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, go to SCAN TOOL DOES NOT POWER UP .
- Turn ignition on, engine off. Try to establish scan tool communication with ALC sensor. If communication with ALC sensor is established, go to next step. If communication with ALC sensor is not established, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 SERIAL DATA LINK .
- Select display DTC function for ALC sensor. Record all displayed DTCs and status of displayed DTCs. If DTCs are displayed, go to BODY CONTROL MODULE (BCM) DTC DEFINITIONS table and perform correct repair procedure. If no DTCs are displayed, attempt to diagnose system by symptom. See appropriate AUTOMATIC LEVEL CONTROL article in SUSPENSION.
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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