Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
This DTC must be active for the results of this test to be valid.
1. Perform any Service Bulletins that may apply.
2. Turn the ignition on.
3. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
4. With the scan tool, read DTCs and record on the repair order.
5. With the scan tool, erase all DTCs.
6. Start the engine and run for two minutes.
7. Turn the steering wheel from stop to stop.
8. With the scan tool, read the ABS DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - 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 and repair as necessary. If no problems are found, test complete.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
PERFORM THE STEERING ANGLE CALIBRATION ROUTINE
1. Turn the ignition on.
2. With the scan tool under EPS, perform the "Steering Angle Calibration/Control unit replacement" routine.
  Was the routine successful?
  
  Yes
  - Go To 4
  No
  - Perform the "Steering Angle Calibration/Control unit replacement" routine again, if still unsuccessful.
  - Go To 3
PERFORM THE LONGITUDINAL AND LATERAL SENSOR ROUTINE
1. With the scan tool, perform the "Longitudinal and Lateral Sensor" routine.
  Was the routine successful?
  
  Yes
  - Go To 4
  No
  - Perform the "Longitudinal and Lateral Sensor" routine again, if still unsuccessful.
  - Go To 5
VERIFY THE DTC REMAINS ACTIVE
1. Turn the ignition on.
2. With the scan tool, erase the DTCs.
  WARNING:
  To avoid possible serious or fatal injury, check brake capability is available before road testing.
3. Test drive the vehicle by turning the vehicle left and right in a curving manner at a velocity between 15 and 35 km/h (9 and 22 mph).
4. Park the vehicle.
5. With the scan tool, read ABS DTCs.
  Does the DTC remain active?
  
  Yes
  - Go To 5
  No
  - Test complete.
REPLACE THE STEERING ANGLE SENSOR (SAS) AND TEST FOR DTCS
1. Turn the ignition off.
  NOTE:
  The Steering Angle Sensor (SAS) is internal to the steering gear and is not serviced separately.
2. Replace the Steering Angle Sensor (SAS) in accordance with service information. Refer to GEAR, REMOVAL .
3. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  WARNING:
  To avoid possible serious or fatal injury, check brake capability is available before road testing.
4. Test drive the vehicle by turning the vehicle left and right in a curving manner at a velocity between 15 and 35 km/h (9 and 22 mph).
5. With the scan tool, read the DTCs.
  Does the DTC remain active?
  
  Yes
  - Go To 6
  No
  - Test complete.
CHECK RELATED HARNESS CONNECTIONS
1. Turn the ignition off.
2. Disconnect the ABS Module harness connector.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. 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.
6. Connect the ABS Module harness connector. Be certain that the harness connector is fully seated and the connector lock is fully engaged.
7. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Connect the related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
  WARNING:
  To avoid personal injury or death, check brake capability is available before road testing.
10. 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.
11. With the scan tool, read ABS Module DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Anti-lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM (ABS), REMOVAL .
  - Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .