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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. Move the shift lever to N and move the vehicle forward and rearward.
    4. Turn the engine switch off.
    5. Connect the Intelligent tester or Techstream to the DLC3.
    6. Start the engine.
    7. Turn the tester on.
    8. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / CHASSIS / AIR SUSPENSION / DATA LIST /
      2. Techstream - select: Chassis / Air suspension / Data List /
    9. Press the height control switch and adjust the vehicle height to "HEIGHT HIGH".
    10. Press the height control switch and return the vehicle height to normal.
    11. Using the DATA LIST, confirm that the vehicle height control operation is complete.
      1. Intelligent tester

        AIR SUSPENSION 

        INTELLIGENT TESTER - AIR SUSPENSION SPECIFICATION

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

        Air suspension 

        TECHSTREAM AIR SUSPENSION SPECIFICATION

        Tester Display Measurement Item/Range Normal Condition Diagnosis Note
        Height Control Vehicle height control condition reading/ ON or OFF ON: Vehicle height control operating
        OFF: Vehicle height control not operating        		 -
    12. Using the Intelligent tester or Techstream
      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 

        INTELLIGENT TESTER - AIR SUSPENSION SPECIFICATION

        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 normal: 0 +/-20 mm (0 +/-0.79 in.)
        When vehicle height is changing: Varies based on vehicle height
        After HEIGHT HIGH adjustment: 20 +/- 20 mm (0.79 +/- 0.79 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 normal: 0 +/-20 mm (0 +/-0.79 in.)
        When vehicle height is changing: Varies based on vehicle height
        After HEIGHT HIGH adjustment: 20 +/- 20 mm (0.79 +/- 0.79 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 in.)        		 When vehicle height normal: 0 +/-20 mm (0 +/-0.79 in.)
        When vehicle height is changing: Varies based on vehicle height
        After HEIGHT HIGH adjustment: 20 +/- 20 mm (0.79 +/- 0.79 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 normal: 0 +/-20 mm (0 +/-0.79 in.)
        When vehicle height is changing: Varies based on vehicle height
        After HEIGHT HIGH adjustment: 20 +/- 20 mm (0.79 +/- 0.79 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 

        TECHSTREAM - AIR SUSPENSION SPECIFICATION

        Tester Display Measurement Item/Range Normal Condition Diagnosis Note
        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.: 3276.7 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 normal: 0 +/-20 mm (0 +/-0.79 in.)
        When vehicle height is changing: Varies based on vehicle height
        After HEIGHT HIGH adjustment: 20 +/- 20 mm (0.79 +/- 0.79 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 normal: 0 +/-20 mm (0 +/-0.79 in.)
        When vehicle height is changing: Varies based on vehicle height
        After HEIGHT HIGH adjustment: 20 +/- 20 mm (0.79+/-0.79 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 normal: 0 +/-20 mm (0 +/-0.79 in.)
        When vehicle height is changing: Varies based on vehicle height
        After HEIGHT HIGH adjustment: 20 +/- 20 mm (0.79 +/- 0.79 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 normal: 0 +/-20 mm (0 +/-0.79 in.)
        When vehicle height is changing: Varies based on vehicle height
        After HEIGHT HIGH adjustment: 20 +/- 20 mm (0.79+/-0.79 in.)        		 -
    13. Turn the engine switch off.
    14. Perform the vehicle height inspection.

      Standard vehicle height 

      STANDARD VEHICLE HEIGHT

      Vehicle Specification Front (Measured height A minus B) Rear (Measured height D minus C)
      18 in. Wheel 98 mm (3.86 in.) 93 mm (3.66 in.)
      19 in. Wheel 98 mm (3.86 in.) 93 mm (3.66 in.)
      Fig 1: Identifying Ground Clearance Of Rear Wheel Center
      G04944111Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Measuring points: 

      1. Ground clearance of front wheel center 
      2. Ground clearance of front suspension lower No. 2 arm assembly front bush installation bolt head rear 
      3. Ground clearance of protrusion of rear suspension arm attachment (lower No. 2 installation cam bolt)  (see ADJUSTMENT )
      4. Ground clearance of rear wheel center 
  2. PERFORM VEHICLE HEIGHT OFFSET CALIBRATION 
    NOTE: The possible vehicle height automatic adjustment value is 20 mm (0.78 in.). If the "Height Adjust" value + (Standard value - Measurement value - "After Height Adjust" value) is 20 mm (0.78 in.) or more, first perform the vehicle height adjustment (height control link adjustment) (see ADJUSTMENT  ).
    1. Turn the engine switch off.
    2. Connect the Intelligent tester or Techstream to the DLC3.
    3. Turn the engine switch on (IG).
    4. Turn the tester ON.
    5. 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 /
    6. 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

    7. Start the engine.
    8. In the DATA LIST, enter "HEIGHT CTRL" or "Height Control".
    9. Press the height control switch and adjust the vehicle height to "HEIGHT HIGH".
    10. Press the height control switch and return the vehicle height to normal.
    11. Using the DATA LIST, confirm that the vehicle height control operation is complete.
      1. Intelligent tester

        AIR SUSPENSION 

        INTELLIGENT TESTER - AIR SUSPENSION SPECIFICATION

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

        Air suspension 

        TECHSTREAM - AIR SUSPENSION SPECIFICATION

        Tester Display Measurement Item/Range Normal Condn Diagnosis Note
        Height Control Vehicle height control condition reading/ ON or OFF ON: Vehicle height control operating
        OFF: Vehicle height control not operating        		 -
    12. Turn the engine switch off.
    13. Perform the vehicle height inspection. Check that the result is within +/-14.3 mm (+/-0.56 in.) of the standard value.

    END 

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