Important: Review the system operation in order to familiarize yourself with the system functions. Refer to
Transfer Case Description and Operation
.
Visual/Physical Inspection
| • | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. |
| • | Ensure all mechanical components are operative before diagnosing the electrical portion of the system. |
| • | In order to determine whether the vehicle is in 2-wheel drive (2WD) or 4-wheel drive (4WD), lift the vehicle so the wheels can spin freely. With the transfer case control lever in 2HI, turn the rear propeller shaft. If the front propeller
shaft does not move with the rear, the vehicle is in 2HI. If the tires and the front propeller shaft moves, the transfer case is in 4WD. |
| • | Ensure the 4WD fuse is not open. If the fuse is open, locate and repair the source of the overload. Refer to
Testing for Short to Ground
. Replace the fuse. |
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:
