Diagnostic Test

CHECK FOR AN ACTIVE DTC
CAUTION:
Do NOT disconnect the Torque Sensor (Grey) harness connector on the electric power steering gear, as permanent damage can occur to the Electric Power Steering (EPS) Module.

NOTE:
Make sure the Torque Sensor (Grey) harness connector is connected properly before continuing with this procedure.

NOTE:
If multiple DTCs are present, inspect the wiring and harness connector at the EPS Assembly.

NOTE:
If the Electric Power Steering (EPS) Module was replaced, verify that the correct EPS Assembly was installed on the vehicle.
1. Turn ignition on.
2. With the scan tool, read EPS DTCs and record on vehicle work order.
3. With the scan tool, erase EPS DTCs.
4. Cycle the ignition from off to on.
5. With the scan tool, read EPS DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Test complete. The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
LOST COMMUNICATION DTCS
1. With the scan tool, read DTCs.
  Are there any Lost Communication DTCs present?
  
  Yes
  - Perform the Stored Lost Communication DTC diagnostic procedure. Refer to STORED LOST COMMUNICATION DTCS .
  No
  - Go To 3
BODY CONTROL MODULE (BCM) CONFIGURATION
1. Using the scan tool, verify that the BCM has been configured.
  Was the BCM configured correctly?
  
  Yes
  - Go To 4
  No
  - Go To 5
CHECK RELATED HARNESS CONNECTIONS
NOTE:
Do not disconnect the Torque Sensor (Grey) harness connector and make sure it is connected properly.
1. Disconnect the EPS Module 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. Connect the EPS Module harness connectors. Be certain that the harness connectors are fully seated and the connector locks are fully engaged.
6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Connect the 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 Event and 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 EPS Module DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Electric Power Steering (EPS) Module in accordance with service information. Refer to GEAR, REMOVAL .
  - Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  - Test complete.
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect the BCM 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. Connect the BCM harness connectors. Be certain that the harness connectors are fully seated and the connector locks are fully engaged.
6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Connect the 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 Event and 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 BCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Body Control Module (BCM) in accordance with service information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
  - Perform the BCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  - Test complete.