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DTC 84-12: Steering Angle Sensor Neutral Position Memorization Incomplete

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION  ).
  1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  2. Check for DTCs with the HDS.

    Are any DTCs indicated with DTC 84-12 at the same time? 

    YES  - Troubleshoot any other DTCs first.

    NO  - Go to step 3.

  3. Clear the DTC with the HDS.
  4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  5. Test-drive the vehicle at 25 mph (40 km/h) or more in the straight ahead driving position, then turn the steering wheel left and right at 30 degrees or more once for each side. Continue test-drive afterwards more than 120 seconds.
    NOTE: Drive the vehicle on the road, not on a lift.
  6. Check for DTCs with the HDS.

    Is DTC 84-12 indicated? 

    YES  - Go to step 7.

    NO  - Intermittent failure, the system is OK at this time. Refer to INTERMITTENT FAILURES TROUBLESHOOTING .

  7. Check the size, air pressure, and the amount of wear of all four tires, and check the wheel alignment (see WHEEL ALIGNMENT ).

    Is the tire condition and wheel alignment OK? 

    YES  - Go to step 8.

    NO  - Make sure the suspension is not modified, and adjust the wheel alignment (see WHEEL ALIGNMENT ), and recheck by test-driving.

  8. Update the VSA modulator-control unit if it does not have the latest software (see VSA MODULATOR-CONTROL UNIT UPDATE  ).
  9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  10. Test-drive the vehicle at 25 mph (40 km/h) or more in the straight ahead driving position, then turn the steering wheel left and right at 30 degrees or more once for each side. Continue test-drive afterwards more than 120 seconds.
    NOTE: Drive the vehicle on the road, not on a lift.
  11. Check for DTCs with the HDS.

    Is DTC 84-12 indicated? 

    YES  - Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION  ).

    NO  - If the VSA modulator-control unit was updated, troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCS TROUBLESHOOTING .

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