Diagnostic Test

Ignition on, engine not running.

With the scan tool, read the Drivetrain 5-volt Supply (Reference) Voltage in the FDCM.

Is the voltage above 5.2 volts? 

Yes 

1. Go to  2).

No 

1. Go to  3).

Fig 1: Checking Drivetrain 5 Volt Supply Circuit Voltage

Courtesy of CHRYSLER LLC

Turn the ignition off to the lock position

Disconnect the Transfer Case Motor harness connector.

Disconnect the Final Drive Control Module C2 harness connector.

Ignition on, engine not running.

Measure the voltage of the (K504) Drivetrain 5 Volt Supply circuit.

Is there any voltage present? 

Yes 

1. Repair the (K504) Drivetrain 5 Volt Supply circuit for a short to voltage.
2. Perform TRANSFER CASE VERIFICATION TEST .

No 

1. Replace the Final Drive Control Module in accordance with the Service information.
2. Perform TRANSFER CASE VERIFICATION TEST .

The conditions necessary to set this DTC are not present at this time.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.

Look for the data to change or for the DTC to reset during the wiggle test.

Were any problems found? 

Yes 

1. Repair as necessary.
2. Perform TRANSFER CASE VERIFICATION TEST .

No 

1. Test complete.