Diagnostic Test

WARNING: This page is about a different car, the 2009 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

DTC IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
1. Ignition on, engine not running.
2. With the scan tool, read DTCs in the Final Drive Control Module.
  Is the status Active for this DTC?
  
  Yes
  - Go to step 2
  No
  - Go to step 5
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
NOTE: Check for TIPM configuration, CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.
1. With the scan tool, read all active DTCs from the TIPM and CCN.
  Does the scan tool display any active DTCs to the conditions listed above?
  
  Yes
  - Perform the appropriate diagnostic procedure. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing or. Refer to DTC-Based Diagnostics/NODE, Cabin Compartment (CCN) - Diagnosis and Testing
  No
  - Go to step 3
AMBIENT TEMPERATURE SENSOR
1. With the scan tool, monitor the ambient temperature in the Totally Integrated Power Module (TIPM).
  Is the ambient temperature at room temperature?
  
  Yes
  - Go to step 4
  No
  - Replace the Ambient Temperature Sensor in accordance with the Service Information.
  - Perform TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .

TRANSFER CASE SELECTOR SWITCH

With the scan tool, monitor the voltages of the transfer case selector switch positions in the CCN.

Transfer Case Selector Switch Position Voltage
Transfer Case Selector Switch Position	Voltage Range
Neutral	0.67 volts - 0.95 volts
2WD	1.98 volts - 2.22 volts
4WD AWD (MP3022)	2.62 volts - 2.88 volts
4WD LOCK (MP1522)	3.39 volts - 3.65 volts
4WD LOW	4.05 volts - 4.30 volts

Are the voltages of the transfer case selector switch within the specified ranges?

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 .

Replace the Transfer Case Selector Switch in accordance with the Service Information.
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 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 TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Test complete.