Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Make sure the battery is fully charged.

NOTE:
Make sure the Torque Sensor (Grey) harness connector is connected properly before continuing with this procedure.
1. Park the vehicle on level ground.
2. Turn the ignition on.
3. With the scan tool, read DTCs and record on vehicle work order.
4. With the scan tool, erase DTCs.
5. Start the engine.
6. Turn the steering wheel from stop to stop.
7. With the scan tool, read the 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.
PCM CHARGING SYSTEM DTCS PRESENT
1. Refer to the recorded DTCs.
  Are there any PCM Charging System or related voltage DTCs active or pending?
  
  Yes
  - Perform the appropriate diagnostic procedure. Refer to DTC INDEX .
  No
  - Go To 3
BCM DTCS PRESENT
1. Refer to the recorded DTCs.
  Are there any BCM DTCs active or pending?
  
  Yes
  - Perform the appropriate diagnostic procedure. Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX .
  No
  - Go To 4
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 C1 and C2 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 AND INSTALLATION .
  - Perform the EPS VERIFICATION TEST. Refer to EPS VERIFICATION TEST .
  No
  - Perform the EPS VERIFICATION TEST. Refer to EPS VERIFICATION TEST .
  - Test complete.