Diagnostic Test

DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go to 2
  No
  - Go to 7
(T315) STEP MOTOR CONTROL B CIRCUIT OPEN

Fig 1: Checking Step Motor Control B Circuit For 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 C2 harness connector.
4. Measure the resistance of the (T315) Step Motor Control B circuit from the Transfer Case Motor harness connector to the FDCM C2 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the open in the (T315) Step Motor Control B circuit.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 3
(T316) STEP MOTOR CONTROL C CIRCUIT OPEN

Fig 2: Checking Step Motor Control C Circuit For Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (T316) Step Motor Control C circuit from the Transfer Case Motor harness connector to the FDCM C2 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the open in the (T316) Step Motor Control C circuit.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 4
(T315) STEP MOTOR CONTROL B CIRCUIT VOLTAGE

Fig 3: Checking Step Motor Control B Circuit For Short To Voltage
Courtesy of CHRYSLER LLC
1. Ignition on, engine off.
2. Measure the voltage of the (T315) Step Motor Control B circuit at the Transfer Case Motor harness connector.
  Is the voltage above 0.5 volts?
  
  Yes
  - Repair the (T315) Step Motor Control B circuit for a short to voltage.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 5
(T316) STEP MOTOR CONTROL C CIRCUIT VOLTAGE

Fig 4: Checking Step Motor Control C Circuit For Short To Voltage
Courtesy of CHRYSLER LLC
1. Measure the voltage of the (T316) Step Motor Control C circuit at the Transfer Case Motor harness connector.
  Is the voltage above 0.5 volts?
  
  Yes
  - Repair the (T316) Step Motor Control C circuit for a short to voltage.
  - Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Final Drive Control (FDCM) - Standard Procedure .
  No
  - Go to 6
TRANSFER CASE MOTOR

Fig 5: Checking Transfer Case Motor
Courtesy of CHRYSLER LLC
1. Reconnect the Transfer Case Motor harness connector.
2. Measure the resistance between the (T315) Step Motor Control B circuit and the (T316) Step Motor Control C circuit at the FDCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - 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 .
  No
  - Replace the Transfer Case Motor 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. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
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.