A Symptoms - ALC

SYMPTOMS - AUTOMATIC LEVEL CONTROL

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

1. Perform the Automatic Level Control Diagnostic System Check before using the symptom table in order to verify that all of the following are true:
- There are no DTCs set.
- The control modules can communicate via the serial data link. Diagnostic System Check - Automatic Level Control (ALC)
2. Review the system operation in order to familiarize yourself with the system functions. Refer to Automatic Level Control Description and Operation.

Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation of the Automatic Level Control System. Refer to Checking Aftermarket Accessories in Diagnostic Aids
- Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
- Inspect the connectors to be properly seated and free of corrosion.

Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Circuit Testing and Wiring Repair procedures.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
- Automatic Level Control Compressor Motor Always On
- Automatic Level Control Compressor Motor Inoperative