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.
Automatic Level Control Scan Tool Data Definitions
The Automatic Level Control (ALC) Scan Tool Data Definitions contains a brief description of all scan tool parameters.
- Battery Voltage
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The scan tool displays 0-26.0 volts. The battery voltage represents the system voltage measured at the controller battery input.
- Compressor Relay Command
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The scan tool displays On/Off. The scan tool will display On when the vehicle trim height is below a preset value. The ALC compressor inflates the rear airlift shocks until the vehicle reaches the desired trim height. When the vehicle is at the desired trim height, the scan tool will display Off.
- Exhaust Valve Command
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The scan tool displays On/Off. The scan tool will display On when the vehicle trim height is above a preset value. The ALC exhaust solenoid deflates the rear airlift shocks until the vehicle reaches the desired trim height. When the vehicle is at the desired trim height, the scan tool will display Off.
- Suspension Position Sensor Signal
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The scan tool displays the voltage signal input from the suspension position sensor.
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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.