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Diagnostic Test

WARNING: This page is about a different car, the 2021 Chrysler 300. 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 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 Drivetrain Control Module (DTCM) DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. CHECK THE SHIFT MOTOR/MODE SENSOR (AWD) OPERATION 
    1. Turn the ignition off.
    2. Disconnect the Shift Motor/Mode Sensor (AWD) harness connector.
    3. Turn the ignition on.
    4. Using a 12-volt test light, jump across from the (T315) Shift Motor Control A circuit and the (T316) Shift Control Motor B circuit at the Transfer Case Motor C1 harness connector.
    5. With the scan tool, actuate the T-case Motor Duty Cycle.

      Does the test light illuminate brightly and flash on and off?

      Yes 

      • Go To  9

      No 

      • Go To  3
  3. CHECK THE (T316) SHIFT CONTROL MOTOR B CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the DTCM harness connector.
    3. Check for continuity between ground and the (T316) Shift Control Motor B circuit at the Transfer Case Motor (AWD) C1 harness connector.

      Is there continuity between ground and the (T316) Shift Control Motor B circuit?

      Yes 

      • Repair the short to ground in the (T316) Shift Control Motor B circuit.
      • Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST  .

      No 

      • Go To  4
  4. CHECK THE (T316) SHIFT CONTROL MOTOR B CIRCUIT OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (T316) Shift Control Motor B circuit between the Transfer Case Motor (AWD) C1 harness connector and the DTCM harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (T316) Shift Control Motor B circuit for an open or high resistance.
      • Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST  .
  5. CHECK THE (T315) SHIFT MOTOR CONTROL A CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (T315) Shift Motor Control A circuit at the Transfer Case Motor (AWD) C1 harness connector.

      Is there continuity between ground and the (T315) Shift Motor Control A circuit?

      Yes 

      • Repair the (T315) Shift Motor Control A circuit for a short to ground.
      • Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST  .

      No 

      • Go To  6
  6. CHECK THE (T315) SHIFT MOTOR CONTROL A CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (T315) Shift Motor Control A circuit between the Transfer Case Motor (AWD) C1 harness connector and the DTCM harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (T315) Shift Motor Control A circuit for an open or high resistance.
      • Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST  .
  7. CHECK THE (T316) SHIFT CONTROL MOTOR B CIRCUIT FOR AN INTERNAL SHIFT MOTOR/MODE SENSOR SHORT 
    1. Turn the ignition off.
    2. Connect the Shift Motor/Mode Sensor (AWD) harness connector.
    3. Check for continuity between ground and the (T316) Shift Control Motor B circuit at the DTCM harness connector.

      Is there continuity between ground and the (T316) Shift Control Motor B circuit?

      Yes 

      • Replace the Shift Motor/Mode Sensor in accordance with the Service Information.
      • Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST  .

      No 

      • Go To  8
  8. DRIVETRAIN CONTROL MODULE (DTCM) 
    NOTE:

    Before continuing, check the DTCM harness connector terminals for corrosion, damage or pushed out terminals. Repair as necessary.

    1. Using the schematics as a guide, inspect the wiring harness and connectors. Pay particular attention to all power and ground circuits.

      Were any problems found?

      Yes 

      No 

      • Go To  10
  9. CHECK THE TRANSFER CASE CLUTCH COIL 
    NOTE:

    Before continuing, check the Transfer Case Motor jumper harness connector terminals for corrosion, damage, or pushed out terminals, repair/replace as necessary.

    1. Using the schematics as a guide, inspect the wiring harness and connectors. Pay particular attention to all Power and Ground circuits.

      Were any problems found?

      Yes 

      • Repair the wiring or poor connections as necessary.
      • Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST  .

      No 

  10. 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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