Diagnostic Test

5-VOLT SUPPLY (REFERENCE) VOLTAGE IS ABOVE 5.2 VOLTS
1. Ignition on, engine not running.
2. With the scan tool, read the Drivetrain 5-volt Supply (Reference) Voltage in the FDCM.
  Is the voltage above 5.2 volts?
  
  Yes
  - Go to step 2
  No
  - Go to step 3
(K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT SHORTED TO 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. Disconnect the Final Drive Control Module C2 harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (K504) Drivetrain 5-volt Supply circuit.
  Is there any voltage present?
  
  Yes
  - Repair the (K504) Drivetrain 5-volt Supply circuit for a short to voltage.
  - Perform the FDCM 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 the FDCM 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 the FDCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Test complete. The conditions that originally set this DTC are not present at this time