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.

T-CASE POSITION SENSOR VOLTAGE ABOVE 4.8 VOLTS
NOTE: If DTCs C1405 and C2112 are both present, refer to the diagnostics procedure for C2112 before continuing.
1. Ignition on, engine not running.
2. With the scan tool, read the T-Case Position Sensor voltage in the FDCM.
  Is the voltage above 4.8 volts?
  
  Yes
  - Go to step 2
  No
  - Go to step 6
(K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE

Fig 1: CHECKING DRIVETRAIN 5-VOLT SUPPLY CIRCUIT INTERMITTENT FOR SHORT TO 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 not running.
4. 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 step 3
(T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 2: CHECKING MODE SENSOR SIGNAL CIRCUIT FOR INTERMITTENT SHORT TO VOLTAGE
Courtesy of CHRYSLER LLC
1. Measure the voltage of the (T313) Mode Sensor Signal circuit at the Transfer Case Encoder 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 step 4
(K594) DRIVETRAIN SENSOR RETURN CIRCUIT OPEN

Fig 3: CHECKING DRIVETRAIN SENSOR RETURN CIRCUIT FOR INTERMITTENT OPEN CIRCUIT 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 C2 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (K594) Drivetrain Sensor Return circuit for an open.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  
  Go to step 5
TRANSFER CASE ENCODER

Fig 4: CHECKING TRANSFER CASE 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 Encoder harness connector.
3. Ignition on, engine not running.
4. With the scan tool, read the T-Case Position Sensor voltage in the FDCM.
  NOTE: Remove the jumper wire before continuing.
  
  Is the voltage below 0.2 of a volt?
  
  Yes
  - Replace the Transfer Case Encoder 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 Encoder 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.
5. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
6. Look for the data to change other than as expected or for the DTC to reset.
  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.