Review the system and operation in order to familiarize yourself with the system functions. Refer to Locking Differential Description and Operation.

1. Inspect the system for the following:

•	Loose or missing fasteners

•	Obvious damage or conditions which may cause the symptom.

2. Check the system for proper operation. Refer to Locking Differential Diagnosis.

Refer to a system diagnostic procedure from the following list in order to diagnose the symptom: