Diagnostic Test

T-CASE POSITION SENSOR VOLTAGE BELOW 0.4 VOLTS
NOTE: If DTCs C1404 and C2112 are both present, perform the diagnostics procedure for C2112 before continuing with this test.
1. Ignition on, engine not running.
2. With the scan tool, read the T-Case Position Sensor voltage in the FDCM.
  Is the voltage below 0.4 volts?
  
  Yes
  - Go to 2
  No
  - Go to 8
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT FOR VOLTAGE

Fig 1: Checking Drivetrain Five Volt Supply Circuit For Voltage
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Disconnect the Transfer Case Encoder harness connector.
3. Ignition on, engine off.
4. Measure the voltage of the (K504) Drivetrain 5-volt Supply circuit at the Transfer Case Encoder harness connector.
  Choose an answer that matches the voltage measured?
  
  Below 4.5 volts
  - Go to 3
  Above 5.5 volts
  - Go to 4
  Between 4.5 volts and 5.5 volts
  - Go to 5
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Fig 2: 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. Measure the resistance of the (K504) Drivetrain 5-volt Supply circuit between the FDCM C1 and the Transfer Case Encoder harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (K504) Drivetrain 5-volt Supply circuit for an open or high resistance.
  No
  - Go to 4
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Fig 3: Checking Drivetrain Five Volt Supply Circuit For Short To Voltage
Courtesy of CHRYSLER LLC
1. Measure the voltage of the (K504) Drivetrain 5-volt Supply circuit at the Transfer Case Encoder 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 5
(T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Fig 4: Checking Mode Sensor Signal Circuit For Short To Ground
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position
2. Disconnect the FDCM C1 harness connector.
3. Measure the resistance between ground and the (T313) Mode Sensor Signal circuit at the Transfer Case Encoder harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (T313) Mode Sensor Signal circuit for a short to ground.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 6
(T313) MODE SENSOR SIGNAL CIRCUIT OPEN

Fig 5: Checking Mode Sensor Signal Circuit For Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (T313) Mode Sensor Signal circuit between the FDCM C1 harness connector and the Transfer Case Encoder harness connector.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (T313) Mode Sensor Signal circuit for an open.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 7
TRANSFER CASE ENCODER

Fig 6: Checking Transfer Case Encoder Mode Sensor
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position
2. Reconnect the FDCM C1 harness connector.
3. Connect a jumper wire between the (T313) Mode Sensor Signal circuit and the (K504) Drivetrain 5 volt supply circuit at the Transfer Case Encoder harness connector.
4. Ignition on, engine off.
5. With the scan tool, read the T-Case Position Sensor voltage in the FDCM.
6. The displayed voltage should be between 4.5 volts and 5.5 volts with the jumper wire in place.
  Does the voltage display as described?
  
  Yes
  - Replace the Transfer Case Encoder Mode Sensor 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 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.