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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Control System (Direct Adaptive Steering) >> Basic Inspection >> Additional Service When Replacing Or Removing DAST Parts >> Work Procedure
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Work Procedure

WARNING: Never move the vehicle during "DAST CALIBRATION (MODE1)" because the steering gear is held in the neutral position until ignition switch OFF.
CAUTION:
  • Be careful for the moving parts, steering wheel and front wheels are steered automatically when start "DAST CALIBRATION (MODE1)".
  • Do not rotate road wheels during the DAST calibration because the system is detected the vehicle running.
  1. CHECK OFF-CENTER (1) 
    1. SYMBOL CONSULT
      1. Set the vehicle to the straight-ahead position.
      2. Ignition switch ON.
        CAUTION:

        Never start the engine.

      3. Select "ST ANGLE SENSOR" in "Data Monitor" mode of "EPS/DAST 3" and check the value.
        Monitor item Standard value
        ST ANGLE SENSOR ST ANGLE SENSOR ≤±120 deg

    Is the inspection result normal?

    YES>>

    GO TO 2.

    NO>>

    • Refer to Diagnosis Procedure  to correct off-center and then, GO TO 2.
      CAUTION:

      Proceeding to the next step with off-center bigger than 120 deg causes the spiral cable to be torn off.

  2. PREPARATION 
    1. SYMBOL CONSULT
      1. Set the front wheel on the turn table.
        NOTE: SYMBOL Do not lift up the vehicle during "DAST CALIBRATION (MODE1)".
      2. Connect the battery charger to protect the battery.
        NOTE: SYMBOL DAST CALIBRATION (MODE1)" has a high current draw.
      3. Ignition switch ON.
        CAUTION:

        Never start the engine.

    >>

    GO TO 3.

  3. ECU CONFIGURATION 
    1. SYMBOL CONSULT
      1. Perform configuration for steering force control module. Refer to Work Procedure .
        NOTE: SYMBOL The replacement of control module included in configuration is not required.
      2. Perform configuration for steering angle main control module. Refer to Work Procedure .
        NOTE: SYMBOL The replacement of control module included in configuration is not required.
      3. Perform configuration for steering angle sub control module. Refer to Work Procedure .
        NOTE: SYMBOL The replacement of control module included in configuration is not required.

    >>

    GO TO 4.

  4. PREPARATION BEFORE DAST CALIBRATION 
    1. Confirm that rear cap projection of steering gear is aligned in the center of the lower joint. Perform "INSPECTION AFTER INSTALLATION." Refer to Removal and Installation .

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

    Repair as necessary, GO TO 5.

  5. DAST CALIBRATION (MODE1) [CLUTCH PHASE LEARNING] 
    1. SYMBOL CONSULT
      1. Perform "DAST CALIBRATION (MODE1)". Refer to Description .
      2. Ignition switch OFF.
        CAUTION:

        Be sure to perform this step.

    >>

    GO TO 6.

  6. CHECK OFF-CENTER (2) 
    1. SYMBOL CONSULT
      NOTE: SYMBOL This confirmation procedure is to confirm that the steering wheel was not rotated 360 deg while performing the DAST calibration.
      CAUTION:

      Proceeding to the next step with the steering wheel rotated 360 deg causes the spiral cable to be torn off.

      1. Ignition switch ON.
        CAUTION:

        Never start the engine.

      2. Select "ST ANGLE SENSOR" in "Data Monitor" mode of "EPS/DAST 3" and check the value.
        Monitor item Standard value
        ST ANGLE SENSOR ST ANGLE SENSOR ≤±20 deg

    Is the inspection result normal?

    YES>>

    GO TO 8.

    NO>>

    GO TO 7.

  7. CORRECT STEERING WHEEL NEUTRAL POSITION 
    1. SYMBOL CONSULT
      1. Separate steering upper shaft from steering clutch assembly. And then, turn the steering wheel to the direction that the "ST ANGLE SENSOR" value returns to 0 deg in "Data Monitor" mode of "EPS/DAST 3".
      2. Connect steering clutch assembly and steering upper shaft. Refer to Removal and Installation .

    >>

    Re-perform the work from configuration to reset the learning information of clutch phase learning. GO TO 3.

  8. DAST CALIBRATION (MODE1) [STEERING RACK NEUTRAL POSITION LEARNING] 
    1. SYMBOL CONSULT Perform "DAST CALIBRATION (MODE1)". Refer to Description .

    >>

    GO TO 9.

  9. ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION 
    1. SYMBOL CONSULT
      1. Select "ST ANGLE SENSOR ADJUSTMENT" in "Work support" mode of "ABS".
      2. Select "Start".
        CAUTION:

        Never touch steering wheel while adjusting steering angle sensor.

      3. After approx. 10 seconds, select "End".
      4. Ignition switch OFF, and then place it ON again.
        CAUTION:

        Be sure to perform this step.

    >>

    GO TO 10.

  10. PERFORM SELF-DIAGNOSIS 
    1. SYMBOL CONSULT
      1. Ignition switch OFF and wait at least 10 seconds.
      2. Start the engine.
        CAUTION:

        Never drive the vehicle.

      3. Select "Self Diagnostic Result" mode of "EPS/DAST 3", "DAST 1" and "DAST 2".

    Is any DTC detected?

    YES>>

    When other than above DTC is detected, perform trouble diagnosis for the detected DTC. Refer to DTC Index  (EPS/DAST 3), DTC Index  (DAST 1), DTC Index  (DAST 2).

    NO>>

    GO TO 11.

  11. FINAL CONFIRMATION 
    1. SYMBOL CONSULT
      1. Ignition switch ON.
        CAUTION:

        Never start the engine.

      2. Select "ANGLE 1" in "Data Monitor" mode of "EPS/DAST 3" and check the value.
        Monitor item Standard value
        ANGLE 1 -4.4 ≤ ANGLE 1 ≤ 4.4

    Is the confirmation result normal?

    YES>>

    Inspection End.

    NO>>

    Slightly lower the tilt position, and then re-perform Work Procedure .

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