Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Perform any Service Bulletins that may apply.
2. Turn the ignition on.
3. With the scan tool, read EPS DTCs and record on the repair order.
4. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
5. With the scan tool, erase EPS DTCs.
  WARNING:
  To avoid possible serious or fatal injury, check brake capability is available before road testing.
6. Test drive the vehicle straight with speeds above 15 km/h (9 mph).
7. Stop the vehicle.
8. Slowly turn the steering wheel from lock to lock.
9. With the scan tool, read EPS DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
INSPECT THE WHEEL ALIGNMENT, STEERING COLUMN AND INTERMEDIATE SHAFT FOR INCORRECT INSTALLATION OR DAMAGE
NOTE:
If available, check the vehicle repair history for collision damage.
1. Turn the ignition off.
2. Inspect the vehicle for proper wheel alignment.
3. Inspect the vehicle for damage causing tracking problems or steering wheel misalignment.
4. Inspect the steering column and intermediate shaft for damage.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the EPS VERIFICATION TEST. Refer to EPS VERIFICATION TEST .
  No
  - Go To 3
CHECK THE STEERING ANGLE
WARNING:
To avoid possible serious or fatal injury, check brake capability is available before road testing.
1. Turn the steering wheel so that the wheels are pointing in a straight ahead position.
2. With scan tool, read the steering angle in the EPS Module.
  Is the Steering Angle reading within ±15° of 0°?
  
  Yes
  - Go To 5
  No
  - Go To 4
PERFORM THE STEERING ANGLE CALIBRATION ROUTINE
1. Cycle the ignition from off to on.
2. With the scan tool, under "Miscellaneous Functions" perform the Steering Angle Calibration routine in the EPS Module.
3. Perform the EPS VERIFICATION TEST. Refer to EPS VERIFICATION TEST .
  Was the routine successful?
  
  Yes
  - Test complete.
  No
  - Perform the " Steering Angle Sensor Calibration" routine again, if still unsuccessful.
  - Go To 5
CHECK RELATED HARNESS CONNECTIONS
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 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.