Diagnostic Test

DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, record and erase DTCs.
3. Test drive the vehicle.
4. Ignition on, engine not running.
5. With the scan tool, read DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 2.
  No
  - Go To 4.
TRANSFER CASE INTERNAL CONDITION
1. Turn the ignition off to the lock position.
2. Inspect the Transfer Case in accordance with the Service Information to determine if there are any mechanical conditions that are preventing the Shift Motor from engaging the requested range.
  Are any mechanical conditions preventing the Shift Motor from engaging the requested range?
  
  Yes
  - Repair or replace the Transfer Case in accordance with the Service Information.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3.
TRANSFER CASE MOTOR
1. Turn the ignition off to the lock position.
2. Using the wiring diagram/schematic as a guide, inspect all wiring and connectors that pertain to this circuit.
3. If any problems are found, repair as necessary and retest.
4. If no other problems are found, replace the Transfer Case Motor in accordance with the Service Information.
5. Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
6. Ignition on, engine not running.
7. Test drive the vehicle.
8. With the scan tool, read DTCs.
  Is the DTC status Active?
  
  Yes
  - Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Refer to MODULE, DRIVETRAIN CONTROL , REMOVAL .
  - Perform the DTCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
INTERMITTENT WIRING HARNESS AND CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
2. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
3. Look for the data to change or for the DTC to reset during the wiggle test.
4. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
5. Look for the data to change other than as expected or for the DTC to reset.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.