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Active Height Control Suspension: 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 in N.
    • Make sure that the easy access mode switch is off.
  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. Start the engine.
    4. Perform the following operation twice:

      Set the vehicle height to LO with the height control switch, and then return the vehicle height to NORMAL.

    5. Turn the engine switch off.
    6. Connect the Techstream to the DLC3.
    7. Move the shift lever to N and move the vehicle forward and rearward.
    8. Turn the engine switch on (IG) and the Techstream on.

      HINT:

      Make sure the engine is not running.

    9. Check that the vehicle height is NORMAL.

      HINT:

      The N of the multi-information display height control indicator in the combination meter turns on.

    10. Perform the vehicle height inspection.

      Measuring points: 

      A: 

      Ground clearance of front wheel center 

      B: 

      Ground clearance of the front adjusting cam bolt center 

      C: 

      Ground clearance of the rear axle shaft center 

      D: 

      Ground clearance of the rear lower control arm front side center 

      Fig 1: Identifying Vehicle Height Measuring Points
      G05638732Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Vehicle Height 

      STANDARD VEHICLE HEIGHT

      Front (A minus B) Rear (C minus D)
      101 mm (3.98 in.) 94 mm (3.70 in.)
    11. Using a jack, set the vehicle to the standard vehicle height and eliminate any difference in height between the left and right sides of the vehicle.
      NOTE: The vehicle height may be outside the calibration range if there is a difference in height between the left and right sides of the vehicle.
    12. Using the Techstream, enter the following menus: Chassis / AHC / Data List. Then read and record the values for "After Height Adjust" and "Height Adjust" for each wheel.

      AHC 

      AHC REFERENCE

      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.)      		 - -
      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.)      		 - -
      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.)      		 - -
      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.)      		 - -
    13. Turn the engine switch off.
  2. PERFORM VEHICLE HEIGHT OFFSET CALIBRATION 
    NOTE: The possible vehicle height automatic adjustment value is 20 mm (0.787 in.). If the "Height Adjust value + (Standard value - Measurement value - After Height Adjust value)" is 20 mm (0.787 in.) or more, first perform the vehicle height adjustment for the front side (See ADJUSTMENT ), and for the rear side (See ADJUSTMENT ).
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG) and the Techstream on.
    4. Enter the following menus: Chassis / AHC / Utility / Height offset.
    5. For each wheel, follow the instructions on the Techstream screen and input the input value to complete the vehicle height offset calibration.

      HINT:

      Input value = Measurement value and standard value

    6. Remove the jack.
    7. Start the engine.
    8. Set the vehicle height to LO and check that LO of the multi-information display height control indicator stops blinking and illuminates.
    9. Set the vehicle height to NORMAL and check that N of the height control indicator stops blinking and illuminates.
    10. Turn the engine switch off.
    11. Perform the vehicle height inspection. Check that the result is within +/-8 mm (+/-0.315 in.) of the standard value.
    12. Perform yaw rate and G sensor zero point calibration (See CALIBRATION ).

      NEXT: END 

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