Diagnostic Test

DTC IS ACTIVE
NOTE: If DTCs C1403 and C2112 are both present, perform the diagnostics procedure for C2112 before continuing with this test.
1. Ignition on, engine not running.
  NOTE: Repair any system undervoltage or overvoltage DTCs that are set in this module before proceeding.
2. With the scan tool, read DTCs.
  Is the DTC status Active at this time?
  
  Yes
  - Go to 2
  No
  - Go to 5
(K594) DRIVETRAIN SENSOR RETURN CIRCUIT HIGH RESISTANCE OR OPEN

Fig 1: Checking Drivetrain Sensor Return Circuit For High Resistance Or Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Disconnect the Transfer Case Motor harness connector.
3. Disconnect the FDCM C1 harness connector.
4. Measure the resistance of the (K594) Drivetrain Sensor Return circuit between the Transfer Case Motor harness connector and the FDCM C1 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the high resistance or open in the (K594) Drivetrain Sensor Return circuit.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 3
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT FOR VOLTAGE

Fig 2: Checking Drivetrain Five Volt Supply Circuit For Voltage
Courtesy of CHRYSLER LLC
1. Reconnect the FDCM C1 harness connector.
2. Connect a jumper wire between the (T313) Mode Sensor Signal circuit and the (K504) Drivetrain 5 Volt Supply circuit at the Transfer Case Motor harness connector.
3. Ignition on, engine not running.
4. With the scan tool, read the Transfer Case Position Sensor voltage.
5. The displayed voltage should be between 4.5 volts and 5.5 volts with the jumper wire in place.
  Does the voltage display as described?
  
  Yes
  - Go to 4
  No
  - Replace the Final Drive Control Module (FDCM) in accordance with the Service Information.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
(K594) DRIVETRAIN SENSOR RETURN CIRCUIT FOR VOLTAGE

Fig 3: Checking Drivetrain Sensor Return Circuit For Voltage
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Connect a jumper wire between the (T313) Mode Sensor Signal circuit and the (K594) Drivetrain Sensor Return circuit at the Transfer Case Motor harness connector.
3. Ignition on, engine not running.
4. With the scan tool, read the Transfer Case Position Sensor voltage.
5. The displayed voltage should be between 0.0 volts and 0.4 volts with the jumper wire in place.
  Does the voltage display as described?
  
  Yes
  - Replace the Transfer Case Motor Mode Sensor 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 Final Drive Control Module (FDCM) 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. While monitoring the scan tool data relative to this circuit, wiggle test the wiring harness 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 TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Test complete.