Diagnostic Test

DTC IS ACTIVE
NOTE: Diagnose and repair any system voltage or Transfer Case related DTCs in the FDCM before continuing with this test.
1. Ignition on, engine running.
2. With the scan tool, erase DTCs.
3. Test drive the vehicle.
4. With the scan tool, read DTCs.
  Does this DTC reset?
  
  Yes
  - Go to 2
  No
  - Go to 9
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE

Fig 1: Checking Drivetrain Five Volt Supply Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position
2. Disconnect the FDCM C1 harness connector.
3. Disconnect the Transfer Case Encoder harness connector.
4. Measure the resistance of the (K504) Drivetrain 5 Volt Supply circuit between the Transfer Case Encoder harness connector and the FDCM C1 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the high resistance in the (K504) Drivetrain 5 Volt Supply circuit.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 3
(T313) MODE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 2: Checking Mode Sensor Signal Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position
2. Measure the resistance of the (T313) Mode Sensor Signal circuit between the Transfer Case Encoder harness connector and the FDCM C1 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the high resistance in the (T313) Mode Sensor Signal circuit.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 4
(K594) DRIVETRAIN SENSOR RETURN CIRCUIT OPEN OR HIGH RESISTANCE

Fig 3: Checking Drivetrain Sensor Return Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K594) Drivetrain Sensor Return circuit between the Transfer Case Encoder harness connector and the FDCM C1 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the high resistance 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 5
(T315) STEP MOTOR CONTROL B CIRCUIT OPEN OR HIGH RESISTANCE

Fig 4: Checking Step Motor Control B Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Disconnect the FDCM C2 harness connector.
2. Measure the resistance of the (T315) Step Motor Control B circuit from the Transfer Case Motor harness connector to the FDCM C2 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (T315) Step Motor Control B circuit for an open or high resistance.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 6
(T316) STEP MOTOR CONTROL C CIRCUIT OPEN OR HIGH RESISTANCE

Fig 5: Checking Step Motor Control C Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (T316) Step Motor Control C circuit from the Transfer Case Motor harness connector to the FDCM C2 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (T316) Step Motor Control C circuit for an open or high resistance.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 7
TRANSFER CLUTCH WORN
1. Connect the Transfer Case Motor harness connector.
2. Connect the FDCM C1 harness connector.
3. Connect the FDCM C2 harness connector.
4. Test drive the vehicle.
5. With the scan tool, monitor the encoder voltage in the FDCM.
  Is the encoder voltage between 4.625 and 4.750 volts?
  
  Yes
  - Replace the worn clutch pack assembly in accordance with the Service Information.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 8
TRANSFER CASE MOTOR

Fig 6: Checking Final Drive Control Module (FDCM)
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (T315) Step Motor Control B circuit and the (T316) Step Motor Control C circuit at the FDCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - 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 .
  No
  - 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 .
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. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
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.