Diagnostic Test

1) DRIVETRAIN 5 VOLT SUPPLY (REFERENCE) VOLTAGE BELOW 4.8 VOLTS
Ignition on, engine not running.

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

Is the voltage below 4.8 volts?

Yes
1. Go to 2).
No
1. Go to 5).
2) TRANSFER CASE SELECTOR SWITCH
Turn the ignition off to the lock position

Disconnect the Transfer Case Selector Switch harness connector.

Ignition on, engine not running.

With the scan tool, monitor the 5 Volt Supply (Reference) Voltage.

Is the voltage above 4.75 volts with the Transfer Case Selector Switch harness disconnected?

Yes
1. Replace the Transfer Case Selector Switch in accordance with the Service Information.
2. Perform TRANSFER CASE VERIFICATION TEST .
No
1. Go to 3).
3) TRANSFER CASE MOTOR
Turn the ignition off to the lock position

Disconnect the Transfer Case Motor harness connector.

Ignition on, engine not running.

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

Is the voltage above 4.75 volts with the Transfer Case Motor harness disconnected?

Yes
1. Replace the Transfer Case Motor in accordance with the Service Information.
2. Perform TRANSFER CASE VERIFICATION TEST .
No
1. Go to 4).
4) (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORT TO GROUND

Fig 1: Checking Drivetrain 5 Volt Supply Circuit For Short To Ground
Courtesy of CHRYSLER LLC

Turn the ignition off to the lock position

Disconnect the Final Drive Control Module harness connector.

Measure the resistance between ground and the (K504) Drivetrain 5- volt Supply circuit.

Is the resistance below 5.0 ohms?

Yes
1. Repair the (K504) Drivetrain 5 Volt Supply circuit for a short to ground.
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 .
5) INTERMITTENT WIRING AND CONNECTORS
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.