Diagnostic Test

Ignition on, engine not running.

With the scan tool, clear Stored DTCs in the Final Drive Control Module.

Test drive the vehicle.

During the test drive, move the Transfer Case Selector Switch to each position several times in accordance with the Service Information.

With the scan tool, read DTCs in the Final Drive Control Module.

Does this DTC reset? 

Yes 

1. Go to  2).

No 

1. Go to  4).

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors relative to this circuit.

While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.

Were any problems found? 

Yes 

1. Repair as necessary.
2. Perform TRANSFER CASE VERIFICATION TEST .

No 

1. Go to  3).

Turn the ignition off to the lock position

Replace the Transfer Case Selector Switch in accordance with the Service Information.

Ignition on, engine not running.

With the scan tool, clear Stored DTCs in the Final Drive Control Module.

Test drive the vehicle.

During the test drive, move the Transfer Case Selector Switch to each position several times in accordance with the Service Information.

With the scan tool, read DTCs in the Final Drive Control Module.

Does this DTC reset? 

Yes 

1. Replace the Final Drive Control Module in accordance with the Service Information.
2. Perform TRANSFER CASE VERIFICATION TEST .

No 

1. Test Complete.
2. Perform TRANSFER CASE VERIFICATION TEST .

The conditions necessary to set this DTC are not present at this time.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.

Look for the data to change or for the DTC to reset during the wiggle test.

Were any problems found? 

Yes 

1. Repair as necessary.
2. Perform TRANSFER CASE VERIFICATION TEST .

No 

1. Test complete.