Diagnostic Test

ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DTCS PRESENT
1. Ignition on, engine not running.
2. With the scan tool, select View DTCs in the ABS Module.
  Are there any ABS DTCs present?
  
  Yes
  - Perform the appropriate diagnostic procedure. Refer to the DTC INDEX article .
  No
  - Go To 2
POWER CONTROL MODULE (PCM) DTCS PRESENT
1. Ignition on, engine not running.
2. With the scan tool, select View DTCs in the PCM.
  Are there any PCM DTCs present?
  
  Yes
  - Perform the appropriate diagnostic procedure. Refer to the DTC INDEX article .
  No
  - Go To 3
DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 4
  No
  - Go To 5
VERIFY SET CONDITION
NOTE:
Check with customer on driving terrain (e.g. mud, sand, snow) for set condition.
1. With the scan tool, erase DTCs.
2. Test drive vehicle on dry paved road.
3. With the scan tool, read DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Replace the Transfer Case in accordance with the Service Information. Refer to MP2010 REMOVAL MP3023 REMOVAL .
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test Complete.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
INTERMITTENT WIRING 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 there 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.