A Symptoms - ALC

Symptoms - Automatic Level Control

Important: The following steps must be completed before using the symptom tables.

1. Perform the Diagnostic System Check - Vehicle Information, before using the Symptom Tables in order to verify that all of the following are true:
^ There are no DTCs set.
^ The control module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions.

Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the Automatic Level Control System. Refer to Checking Aftermarket Accessories.
^ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
^ Air Compressor Leak Test Air Compressor Leak Test - ALC
^ Automatic Level Control System Leak Test System Leak Test - ALC
^ Rear of Vehicle High (w/F45) With RPO F45
^ Rear of Vehicle High (w/o F45) Without RPO F45
^ Rear of Vehicle Low (w/F45) With RPO F45
^ Rear of Vehicle Low (w/o F45) Without RPO F45