System Operation Check - ALC

Automatic Level Control System Operation Check








Support the rear wheels or support the rear lower control arms when certain tests require raising the vehicle on a hoist. Use two additional jack stands to support the rear lower control arms in its normal curb weight position when a frame type hoist is used. Refer to trim height specifications.
Refer to ALC Suspension System Check for electrical troubleshooting of the Automatic Level Control (ALC) system or if DTC's are present.

Diagnosing Leveling Complaints Without DTCs Present Procedure
Perform the following preliminary inspections before performing the system performance test:
1. Inspect the ignition (pin A & H) at the ALC sensor connector.
2. Ensure the ignition (pin A & H) at the ALC sensor connector connection is secure.
3. Inspect the ground (pin E) at the ALC sensor connector.
4. Ensure the ground (pin E) at the ALC sensor connector connection is secure.
5. Inspect the ALC sensor link.
6. Ensure that the ALC sensor link is properly secured to the actuator arm.
7. Inspect the ALC sensor actuator arm for damage.