Diagnostic Test

DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go to step 2
  No
  - Go to step 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 TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to step 3
TRANSFER CASE MOTOR
1. Turn the ignition off to the lock position
2. Using the SYSTEM WIRING DIAGRAMS 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. Ignition on, engine not running.
6. Cycle the Transfer Case Selector Switch to each position several times during a test drive.
7. With the scan tool, read DTCs.
  Is the DTC status Active?
  
  Yes
  - Replace the Final Drive Control Module (FDCM) in accordance with the Service Information.
  - Perform TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Test complete.
  - Perform TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the SYSTEM WIRING DIAGRAMS as a guide, inspect the wiring and connectors.
3. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
4. Look for the data to change or for the DTC to reset during the wiggle test.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Test complete.