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 for aftermarket devices which could affect the operation
of the Manual Selectable 4-Wheel Drive System. Refer to
Checking Aftermarket Accessories
in Wiring Systems. |
| • | Inspect the easily accessible, or the 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 that the wheels can spin
freely. With the transfer case control lever in 2HI, turn the rear propshaft.
If the front propshaft does not move with the rear, the vehicle
is in 2HI. If the tires and the front propshaft moves, the transfer case is
actually in 4WD. |
| • | Make sure that the 4WD fuse is not open. If open, locate and
repair the source of the overload. Refer to
Testing for Short to Ground
in Wiring Systems. 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
in Wiring Systems.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order
to diagnose the symptom:
