Diagnostic Test

DTC IS ACTIVE
1. Ignition on, engine off.
2. With the scan tool, read the Front Control Module (FCM) DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go to step 2
  No
  - Go to step 5
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. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 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 harness 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 off.
6. Cycle the Transfer Case Selector Switch to each position several times during a test drive.
7. With the scan tool, read the Front Control Module (FCM) DTCs.
  Is the DTC status Active?
  
  Yes
  - Go to step 4
  No
  - Test complete.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
FRONT CONTROL MODULE (FCM)
1. Using the wiring diagram/schematic as a guide, inspect all wiring and harness connectors that pertain to this circuit.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the Front Control Module (FCM) in accordance with the Service Information.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the wiring diagram/schematic 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 the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Test complete.