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Air Suspension System: Initialization

  1. DESCRIPTION 
    1. If replacing the suspension control ECU and/or height control sensor, perform the vehicle height offset calibration.
  2. VEHICLE HEIGHT OFFSET CALIBRATION 
    NOTE:
    • Make sure that the pressure of the tires is normal.
    • Make sure that the vehicle is empty.
    • Make sure that the parking brake is released and that the shift lever is on N.
  1. PERFORM VEHICLE HEIGHT INSPECTION 
    1. Adjust the pressure of the tires.
    2. Stabilize the suspension by releasing the parking brake and bouncing the corners of the vehicle up and down.
    3. Turn the power switch OFF.
    4. Connect the Intelligent tester or Techstream to the DLC3
    5. Turn the power switch ON (READY) and the tester ON.
    6. Enter the following menus.
      1. Intelligent tester - Select. DIAGNOSIS / OBD/MOBD / CHASSIS / AIR SUSPENSION / DATA LIST.
      2. Techstream - Select. Chassis / Air suspension / Data List
    7. Press the height control switch and adjust the vehicle height to "HEIGHT HIGH".
    8. Press the height control switch and return the vehicle height to NORMAL.
    9. Using the DATA LIST, confirm that the vehicle height control operation is complete.
      1. Intelligent tester

        AIR SUSPENSION 

        DIAGNOSIS NOTE NORMAL CONDITION CHART

        Tester Display Measurement Item/Range Normal Condition Diagnosis Note
        HEIGHT CTRL Vehicle height control condition reading /
        ON or OFF        		 ON: Vehicle height control is operating
        OFF: Vehicle height control is not operating        		 -
      2. Techstream

        Air suspension 

        DIAGNOSIS NOTE NORMAL CONDITION CHART

        Tester Display Measurement Item/Range Normal Condition Diagnosis Note
        Height Control Vehicle height control condition reading /
        ON or OFF        		 ON: Vehicle height control is operating
        OFF: Vehicle height control is not operating        		 -
    10. Turn the power switch OFF.
    11. Move the shift lever to N and move the vehicle forward and rearward.
    12. Turn the power switch ON (IG)
    13. Using the Intelligent tester or Techstream, read the DATA LIST
      1. Intelligent tester

        Enter the following menus- DIAGNOSIS / OBD/ MOBD / CHASSIS / AIR SUSPENSION / DATA LIST. Then read and write the values for "ADJUST" and "AFTER ADJUST" for each wheel.

        AIR SUSPENSION 

        DIAGNOSIS NOTE NORMAL CONDITION CHART

        Tester Display Measurement Item/Range Normal Condition Diagnosis Note
        FR ADJUST Display of vehicle height offset recorded value of front right wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 - -
        FL ADJUST Display of vehicle height offset recorded value of front left wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 - -
        RR ADJUST Display of vehicle height offset recorded value of rear right wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 - -
        RL ADJUST Display of vehicle height offset recorded value of rear left wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 - -
        FR AFTER ADJUST Display of after-calibration vehicle height value of front right wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 When vehicle height is NORMAL 0 +/-20 mm (0 +/-0 787 in)
        When vehicle height is changing Varies based on vehicle height After HEIGHT HIGH adjustment 20 +/-20 mm (0 787 +/-0 787 in)        		 -
        FL AFTER ADJUST Display of after-calibration vehicle height value of front left wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 When vehicle height is NORMAL 0 +/-20 mm (0 +/-0 787 in)
        When vehicle height is changing Varies based on vehicle height After HEIGHT HIGH adjustment 20 +/-20 mm (0 787 +/-0 787 in)        		 -
        RR AFTER ADJUST Display of after-calibration vehicle height value of rear right wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 m)        		 When vehicle height is NORMAL 0 +/-20 mm (0 +/-0 787 in)
        When vehicle height is changing Varies based on vehicle height After HEIGHT HIGH adjustment 20 +/-20 mm (0 787 +/-0 787 in)        		 -
        RL AFTER ADJUST Display of after-calibration vehicle height value of rear left wheel /
        min: -3276 8 mm (-129 in.)
        max: 3276 7 mm (129 in)        		 When vehicle height is NORMAL 0 +/-20 mm (0 +/-0 787 in)
        When vehicle height is changing Vanes based on vehicle height After HEIGHT HIGH adjustment 20 +/-20 mm (0 787 +/-0 787 in)        		 -
      2. Techstream:

        Enter the following menus: Chassis / Air suspension / Data List. Then read and write the values for "After Height Adjust" and "Height Adjust" for each wheel.

        Air suspension 

        DIAGNOSIS NOTE NORMAL CONDITION CHART

        Tester Display Measurement Item/Range Normal Condition
        FR Height Adjust Display of vehicle height offset recorded value of front right wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 -
        FL Height Adjust Display of vehicle height offset recorded value of front left wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 -
        RR Height Adjust Display of vehicle height offset recorded value of rear right wheel /
        min: -3276 8 mm (-129 in)
        max: 32767 mm (129 in)        		 -
        RL Height Adjust Display of vehicle height offset recorded value of rear left wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 -
        FR After Height Adjust Display of after-calibration vehicle height value of front right wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 When vehicle height is NORMAL 0 +/-20 mm (0 +/-0 787 in)
        When vehicle height is changing Varies based on vehicle height After HEIGHT HIGH adjustment 20 +/-20 mm (0 787 +/-0 787 in)
        FL After Height Adjust Display of after-calibration vehicle height value of front left wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 When vehicle height is NORMAL 0 +/-20 mm (0 +/-0 787 in)
        When vehicle height is changing Vanes based on vehicle height After HEIGHT HIGH adjustment 20 +/-20 mm (0 787 +/-0 787 in)
        RR After Height Adjust Display of after-calibration vehicle height value of rear right wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 When vehicle height is NORMAL 0 +/-20 mm (0 +/-0 787 in)
        When vehicle height is changing Varies based on vehicle height After HEIGHT HIGH adjustment 20 +/-20 mm (0 787 +/-0 787 in)
        RL After Height Adjust Display of after-calibration vehicle height value of rear left wheel /
        min: -3276 8 mm (-129 in)
        max: 3276 7 mm (129 in)        		 When vehicle height is NORMAL 0 +/-20 mm (0 +/-0 787 in)
        When vehicle height is changing Varies based on vehicle height After HEIGHT HIGH adjustment 20 +/-20 mm (0 787 +/-0 787 in)
    14. Turn the power switch OFF
    15. Perform the vehicle height inspection.

      Standard vehicle height 

      VEHICLE HEIGHT SPECIFICATION CHART

      Front (A - B) Rear (C - D)
      146 mm (5.75 in.) 83 mm (3.27 in.)

      Measuring points: 

      A: 

      Ground clearance of front wheel center 

      B: 

      Ground clearance of head center of bolt used to install front No. 1 suspension lower arm to front suspension member 

      C: 

      Ground clearance of rear wheel center 

      D: 

      Ground clearance of pit center of attachment rear suspension arm 

      Fig 1: Identifying Vehicle Height Inspection Points
      G05773700Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. PERFORM VEHICLE HEIGHT OFFSET CALIBRATION 
    NOTE: The possible vehicle height automatic adjustment value is 20 mm (0.787 in.). If the "ADJUST"*1 or "Height Adjust"*2 value + (Standard value - Measurement value - "AFTER ADJUST"*1 or "After Height Adjust"*2 value) is 20 mm (0.787 in.) or more, first perform the vehicle height adjustment (height control link adjustment) (see ADJUSTMENT  ).

    HINT:

    • *1: Intelligent tester
    • *2: Techstream
    1. Turn the power switch OFF.
    2. Connect the Intelligent tester or Techstream to the DLC3.
    3. Turn the power switch ON (IG) and the tester ON
    4. Enter the following menus:
      1. Intelligent tester - Select DIAGNOSIS / OBD/MOBD / CHASSIS / AIR SUSPENSION / HEIGHT OFFSET.
      2. Techstream - Select: Chassis / Air suspension / Utility / Height Offset
    5. For each wheel, follow the instructions on the tester screen and input the input value to complete the vehicle height offset calibration.

      HINT:

      Input value = Measurement value

    6. Turn the power switch ON (READY).
    7. In the DATA LIST, enter "HEIGHT CTRL" or "Height Control".
    8. Press the height control switch and adjust the vehicle height to "HEIGHT HIGH".
    9. Press the height control switch and return the vehicle height to NORMAL.
    10. Using the DATA LIST, confirm that the vehicle height control operation is complete.
      1. Intelligent tester

        AIR SUSPENSION 

        DIAGNOSIS NOTE NORMAL CONDITION CHART

        Tester Display Measurement Item/Range Normal Condition
        HEIGHT CTRL Vehicle height control condition reading /
        ON or OFF        		 ON: Vehicle height control is operating
        OFF: Vehicle height control is not operating
      2. Techstream

        Air suspension 

        DIAGNOSIS NOTE NORMAL CONDITION CHART

        Tester Display Measurement Item/Range Normal Condition
        Height Control Vehicle height control condition reading /
        ON or OFF        		 ON: Vehicle height control is operating
        OFF: Vehicle height control is not operating
    11. Turn the power switch OFF
    12. Perform the vehicle height inspection. Check that the result is within +/-14.3 mm (+/-0.563 in) of the standard value.

    NEXT: END 

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