Yukon/Denali 2WD V8-6.0L VIN U (2004)
Suspension Control ( Automatic - Electronic ): Symptom Related Diagnostic Procedures
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 ail of the following are true:
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There are no DTCs set.
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The control modules can communicate via the serial data link.
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
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Inspect for aftermarket devices which could affect the operation of the Automatic Level Control System.
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Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
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Inspect the connectors to be properly seated and free of corrosion.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
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Automatic Level Control Compressor Motor Always On See: Diagnosis By Symptom - Automatic Level Control (ALC)/Compressor Motor
Always On - ALC
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Automatic Level Control Compressor Motor Inoperative on base See: Diagnosis By Symptom - Automatic Level Control (ALC)/Compressor
Motor Inoperative - ALC
