Diagnostic Test

DTC IS ACTIVE
NOTE: Repair any system undervoltage or overvoltage DTCs that are set in this module before proceeding.

NOTE: If DTCs C1405 and C2112 are both present, refer to the diagnostics procedure for C2112 before continuing with this procedure.
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.
  Is the DTC status Active at this time?
  
  Yes
  - Go to 2
  No
  - Go to 7
TRANSFER CASE POSITION SENSOR VOLTAGE ABOVE 4.8 VOLTS
1. With the scan tool, read the Transfer Case Position Sensor voltage in the FDCM.
  Is the voltage above 4.8 volts?
  
  Yes
  - Go to 3
  No
  - Go to 5
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking Drivetrain Five Volt Supply Circuit For Short To Voltage
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Disconnect the Transfer Case Motor harness connector.
3. Ignition on, engine not running.
4. Measure the voltage of the (K504) Drivetrain 5 Volt Supply circuit at the Transfer Case Motor harness connector.
  Is the voltage above 5.5 volts?
  
  Yes
  - Repair the (K504) Drivetrain 5 Volt Supply circuit for a short to voltage.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 4
(T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 2: Checking Mode Sensor Signal Circuit For Short To Voltage
Courtesy of CHRYSLER LLC
1. Measure the voltage of the (T313) Mode Sensor Signal circuit at the Transfer Case Motor harness connector.
  Is the voltage above 5.5 volts?
  
  Yes
  - Repair the (T313) Mode Sensor Signal circuit for a short to voltage.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 5
(K594) DRIVETRAIN SENSOR RETURN CIRCUIT OPEN

Fig 3: Checking Drivetrain Sensor Return Circuit For Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K594) Drivetrain Sensor Return circuit between the Transfer Case Motor harness connector and the FDCM C2 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the open in the (K594) Drivetrain Sensor Return circuit.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  
  Go to 6
TRANSFER CASE MOTOR/ENCODER

Fig 4: Checking Transfer Case Motor/Encoder
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position
2. Connect a jumper wire between the (K594) Drivetrain Sensor Return circuit and the (T313) Mode Sensor Signal circuit in the Transfer Case Motor harness connector.
3. Ignition on, engine not running.
4. With the scan tool, read the Transfer Case Position Sensor voltage in the FDCM.
  NOTE: Remove the jumper wire before continuing.
  
  Is the voltage below 0.2 volts?
  
  Yes
  - Replace the Transfer Case Motor in accordance with the Service Information.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Replace the Final Drive Control Module (FDCM) in accordance with the Service information.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
INTERMITTENT WIRING HARNESS 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 harness and connectors.
3. While monitoring the scan tool data relative to this circuit, wiggle test the wiring harness 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, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Test complete.