Diagnostic Test

T-CASE POSITION SENSOR VOLTAGE BELOW 0.4 VOLTS
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 step 2
  No
  - Go to step 7
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT VOLTAGE

Fig 1: Checking Drivetrain 5 Volt Supply Circuit 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.
  Is the voltage below 0.2 volts?
  
  Yes
  - Go to step 3
  No
  - Go to step 5
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT OPEN

Fig 2: Checking Drivetrain 5 Volt Supply Circuit High Resistance
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position
2. Disconnect the FDCM C2 harness connector.
3. Measure the resistance of the (K504) Drivetrain 5-volt Supply circuit between the Transfer Case Motor harness connector and the Final Drive Control Module C2 harness connector.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (K504) Drivetrain 5-volt Supply circuit for an open.
  - Perform TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to step 4
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 3: Checking Drivetrain 5 Volt Supply Circuit Shorted To Ground
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (K504) Drivetrain 5-volt Supply circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (K504) Drivetrain 5-volt Supply circuit for a short to ground.
  - Perform 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 TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
TRANSFER CASE MOTOR
1. With the scan tool, read the T-Case Position Sensor voltage in the FDCM.
  Is the voltage above 4.5 volts?
  
  Yes
  - Replace the Transfer Case Motor in accordance with the Service Information.
  - Perform TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to step 6
(T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Fig 4: Checking Mode Sensor Signal Circuit Shorted To Ground
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (T313) Mode Sensor Signal circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (T313) Mode Sensor Signal circuit for a short to ground.
  - Perform TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Replace the Final Drive Control Module 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 SYSTEM WIRING DIAGRAMS 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.