Diagnostic Test

DTC IS ACTIVE
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 the DTCs in the FCM.
  Is the DTC status Active at this time?
  
  Yes
  - Go to step 2
  No
  - Go to step 11
(T103) 5-VOLT SUPPLY CIRCUIT VOLTAGE

Fig 1: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Disconnect the Shift Motor/Mode Sensor harness connector.
3. Ignition on, engine not running.
4. Measure the voltage of the (T103) Drivetrain 5-volt Supply circuit.
  Select the correct displayed voltage reading:
  
  Voltage greater than 5.5 volts.
  - Repair the (T103) Drivetrain 5-volt Supply circuit for a short to voltage.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  Voltage between 4.5 and 5.5 volts.
  - Go to step 5
  Voltage less than 4.5 volts.
  - Go to step 3
(T103) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT HIGH RESISTANCE

Fig 2: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Disconnect the FCM C1 harness connector.
3. Measure the resistance of the (T103) Drivetrain 5-volt Supply circuit between the FCM C1 harness connector and the Shift Motor/Mode Sensor harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the high resistance in the (T103) Drivetrain 5-volt Supply circuit.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 4
(T103) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Fig 3: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (T103) 5-volt Supply circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (T103) Drivetrain 5-volt Supply circuit for a short to ground.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the Front Control Module (FCM) in accordance with the Service Information.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(D201) MODE SENSOR SIGNAL CIRCUIT HIGH RESISTANCE

Fig 4: Checking Mode Sensor Signal Circuit High Resistance
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Disconnect the FCM C1 harness connector.
3. Measure the resistance of the (D201) Mode Sensor Signal circuit between the FCM C1 harness connector and the Shift Motor/Mode Sensor harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the high resistance in the (D201) Mode Sensor Signal circuit.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 6
(D201) MODE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Fig 5: Checking Mode Sensor Signal Circuit Shorted To Ground
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (D201) Mode Sensor Signal circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (D201) Mode Sensor Signal circuit for a short to ground.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 7
(D201) MODE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 6: Checking Mode Sensor Signal Circuit Shorted To Voltage
Courtesy of CHRYSLER LLC
1. Ignition on, engine not running.
2. Measure the voltage between ground and the (D201) Mode Sensor Signal circuit.
  Is there any voltage present?
  
  Yes
  - Repair the (D201) Mode Sensor Signal circuit for a short to voltage.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 8
(G180) FRONT CONTROL MODULE (FCM) SENSOR RETURN CIRCUIT HIGH RESISTANCE

Fig 7: Checking Front Control Module (FCM) Sensor Return Circuit High Resistance
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Measure the resistance between ground and the (G180) FCM Sensor Return circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go to step 9
  No
  - Repair the high resistance in the (G180) FCM Sensor Return circuit.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(T103) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT FOR VOLTAGE

Fig 8: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Connect a jumper wire between the (D201) Mode Sensor Signal circuit and the (T103) 5-Volt Supply circuit.
3. Ignition on, engine not running.
4. With the scan tool under Data Display, read the T-Case Position Sensor voltage.
5. The displayed voltage should be approximately 5 volts with the jumper wire in place.
  Does the voltage read 5.0 (± 0.02 volts)?
  
  Yes
  - Go to step 10
  No
  - Replace the Front Control Module (FCM) in accordance with the Service Information.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(G180) FRONT CONTROL MODULE (FCM) SENSOR RETURN CIRCUIT FOR GROUND

Fig 9: Checking Mode Sensor Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Connect a jumper wire between the (D201) Mode Sensor Signal circuit and the (G180) FCM Sensor Return circuit.
3. Ignition on, engine not running.
4. With the scan tool under Data Display, read the Transfer Case Position Sensor voltage.
5. The displayed voltage should be approximately 0 volts with the jumper wire in place.
  Does the voltage read 0.0 (± 0.02 volts)?
  
  Yes
  - Replace the Transfer Case Motor in accordance with the Service Information.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the Front Control Module (FCM) in accordance with the Service Information.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
INTERMITTENT WIRING 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.
5. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
6. Look for the data to change other than as expected or for the DTC to reset.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Test complete.