Diagnostic Test

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
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE (T315) SHIFT MOTOR CONTROL A CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Turn the ignition off
2. Disconnect the Transfer Case Shift Motor C1 harness connector.
3. Disconnect the DTCM C2 harness connector.
4. Measure the resistance of the (T315) Shift Motor Control A circuit between the Transfer Case Shift Motor C1 harness connector and the DTCM C2 harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 3
  No
  - Repair the (T315) Shift Motor Control A circuit for an open.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to TRANSFER CASE VERIFICATION TEST .
CHECK THE (T316) SHIFT MOTOR CONTROL B CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Measure the resistance of the (T316) Shift Motor Control B circuit between the Transfer Case Shift Motor C1 harness connector and the DTCM C2 harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (T316) Shift Motor Control B circuit for an open or high resistance.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to TRANSFER CASE VERIFICATION TEST .
CHECK THE (T315) SHIFT MOTOR CONTROL A CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition on.
2. Measure voltage on the (T315) Shift Motor Control A circuit at the Transfer Case Shift Motor C1 harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (T315) Shift 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
CHECK THE (T316) SHIFT MOTOR CONTROL B CIRCUIT FOR A SHORT TO VOLTAGE
1. Measure voltage on the (T316) Shift Motor Control B circuit at the Transfer Case Shift Motor C1 harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (T316) Shift 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
CHECK THE TRANSFER CASE SHIFT MOTOR RESISTANCE
1. Reconnect the Transfer Case Shift Motor C1 harness connector.
2. Measure the resistance between the (T315) Shift Motor Control A circuit and the (T316) Shift 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 in accordance with the Service Information. For MP3023, Refer to MOTOR, SHIFT, REMOVAL .
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to TRANSFER CASE VERIFICATION TEST .
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
  - Replace the DTCM in accordance with the Service information. Refer to MODULE, DRIVETRAIN CONTROL (DTCM), REMOVAL .
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .