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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1606 ((Drivetrain Control Module (DTCM) - Electrical Diagnostics - 2500 Hd)) >> DTC Troubleshooting >> C140D-Transfer Case Motor Control Circuit Open >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, read Drivetrain Control Module (DTCM) DTCs and record on the repair order.
    2. Record the Environmental Data.
    3. With the scan tool, erase DTCs.
    4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    5. With the scan tool, read DTCM DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (T315) STEP MOTOR CONTROL A CIRCUIT FOR AN OPEN 
    1. Turn the ignition off.
    2. Disconnect the Transfer Case Motor harness connector.
    3. Disconnect the DTCM C2 harness connector.
    4. Measure the resistance of the (T315) Step Motor Control A circuit from the Transfer Case Motor harness connector to the DTCM C2 harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      No 

      • Go To  3
  3. CHECK THE (T316) STEP MOTOR CONTROL B CIRCUIT FOR AN OPEN 
    1. Measure the resistance of the (T316) Step Motor Control C circuit from the Transfer Case Motor harness connector to the DTCM C2 harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      No 

      • Go To  4
  4. CHECK THE (T315) STEP MOTOR CONTROL A CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition on.
    2. Measure the voltage on the (T315) Step Motor Control A circuit at the Transfer Case Motor harness connector.

      Is the voltage above 0.5 of a volt?

      Yes 

      • Repair the (T315) Step Motor Control A circuit for a short to voltage.
      • Perform the TRANSFER CASE VERIFICATION TEST. Refer to TRANSFER CASE VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (T316) STEP MOTOR CONTROL B CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Measure the voltage on the (T316) Step Motor Control B circuit at the Transfer Case Motor harness connector.

      Is the voltage above 0.5 of a volt?

      Yes 

      • Repair the (T316) Step Motor Control B circuit for a short to voltage.
      • Perform the TRANSFER CASE VERIFICATION TEST. Refer to TRANSFER CASE VERIFICATION TEST .

      No 

      • Go To  6
  6. CHECK RESISTANCE THROUGH THE TRANSFER CASE SHIFT MOTOR/MODE SENSOR ASSEMBLY 
    1. Connect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.
    2. Measure the resistance between the (T315) Step Motor Control A circuit and the (T316) Step Motor Control B circuit at the DTCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Replace the Transfer Case Shift Motor/Mode Sensor Assembly in accordance with the Service Information.
      • Perform the TRANSFER CASE VERIFICATION TEST. Refer to TRANSFER CASE VERIFICATION TEST .
  7. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all DTCM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

      Repair any conditions that are found.

    5. Reconnect all DTCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    10. With the scan tool, read DTCM DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
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