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Home >> Toyota >> 2006 >> Land Cruiser >> Repair and Diagnosis >> Suspension >> Suspension Control Systems >> Suspension Control System >> Active Height Control Suspension >> On-Vehicle Inspection

On-Vehicle Inspection

  1. INSPECT FLUID LEVEL 
    1. Start the engine on a level place. Adjust the vehicle height to "N" position with the vehicle unloaded.
      NOTE: After adjusting the vehicle height to control the fluid pressure in the height control accumulator, do not turn the engine OFF.
    2. Check that the fluid level in the reservoir tank of the AHC pump and motor is within the standard range.
      Fig 1: Inspecting Fluid Level
      G04437410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. OPERATE HEIGHT SELECT SWITCH AND CHECK CHANGE OF VEHICLE HEIGHT 
    1. Check the tires for the proper inflation pressure (see INSPECTION ).
    2. Check the vehicle height (see FRONT WHEEL ALIGNMENT ).
    3. Start the engine.
    4. Push the height select switch to change from "N" to the "HI" mode.
    5. Check the time required for the height changed and the changed amount of the vehicle height.

      Standard value 

      TERMINAL CONDITION

      Operation Specified Condition
      "HI" mode (Up time) 15 sec or less

      Amount of change in vehicle height 

      ITEM OPERATION TABLE

      Item Specified Condition
      Front 30 to 45 mm (1.18 to 1.77 in.)
      Rear 40 to 55 mm (1.57 to 2.17 in.)
      Fig 2: Checking Vehicle Height (Hi Mode)
      G04437411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: After vehicle height control has been completed, wait for approximately 5 seconds until the height is fixed securely, then check the changed amount of vehicle height.
    6. Push the height select switch to change from "N" to the "LO" mode.
    7. Check the time required for the height change and the changed amount of the vehicle height.

      Standard value 

      ITEM OPERATION TABLE

      Operation Specified Condition
      "LO" mode (Down time) 10 sec or less

      Amount of change in vehicle height 

      ITEM SPECIFIED CONDITION

      Item Specified Condition
      Front 40 to 55 mm (1.57 to 2.17 in.)
      Rear 30 to 45 mm (1.18 to 1.77 in.)
      Fig 3: Checking Vehicle Height (Lo Mode)
      G04437412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: After vehicle height control has been completed, wait for approximately 5 seconds until the height is fixed securely, then check the changed amount of vehicle height.
  3. INSPECT SUSPENSION CONTROL SWITCH (HEIGHT SELECT SWITCH) 
    1. Remove the suspension control switch.
    2. Disconnect the suspension control switch (for height select switch) connector.
    3. Measure the resistance between terminals 6, 10 and 4 of suspension control switch (for height select switch) connector when UP and DOWN button of the height select switch is pushed.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      6 - 4 UP button pushed Below 1 Ω
      6 - 4 DOWN button pushed 10 kΩ or higher
      10 - 4 DOWN button pushed Below 1 Ω
      10 - 4 UP button pushed 10 kΩ or higher
      Fig 4: Measuring Resistance Between Terminals 6, 10 & 4 Of Suspension Control Switch
      G04437413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT SUSPENSION CONTROL SWITCH (DAMPING MODE SELECT SWITCH) 
    1. Remove the suspension control switch.
    2. Disconnect the suspension control switch (for damping mode select switch) connector.
    3. Measure the resistance between terminals 2, 7 and 4 of the suspension control switch (for damping mode select switch) connector when changing the damping mode select switch to each mode.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      2 - 4 COMFORT Below 1 Ω
      2 - 4 NORMAL Below 1 Ω
      2 - 4 SPORT 1 10 kΩ or higher
      2 - 4 SPORT 2 10 kΩ or higher
      7 - 4 COMFORT 10 kΩ or higher
      7 - 4 NORMAL Below 1 Ω
      7 - 4 SPORT 1 Below 1 Ω
      7 - 4 SPORT 2 10 kΩ or higher
      Fig 5: Measuring Resistance Between Terminals 2, 7 & 4 Of Suspension Control Switch
      G04437414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT SUSPENSION CONTROL SWITCH (HEIGHT CONTROL SWITCH) 
    1. Remove the suspension control switch.
    2. Disconnect the suspension control switch (for height control switch) connector.
    3. Measure the resistance between terminals 9 and 4 of the suspension control switch (for height control switch) connector when the height control switch is pushed and released.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      9 - 4 Pushed Below 1 Ω
      9 - 4 Released 10 kΩ or higher
  6. INSPECT VEHICLE SPEED SENSING FUNCTION 
    1. When vehicle height is in the "LO" position:
      1. Start the engine and push the height select switch to select the "LO" mode.
      2. Drive the vehicle at approximately 10 km/h (7 mph) or more and check with an indicator that the vehicle height changes from "LO" to "N".
    2. When vehicle height is in the "HI" position:
      1. Start the engine and push the height select switch to select the "HI" mode.
      2. Drive the vehicle at 30 km/h (19 mph) or more and check with an indicator that the vehicle height changes from "HI" to "N".
        Fig 6: Inspecting Vehicle Speed Sensing Function
        G04437415Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. When the height control switch is operated:
      1. Push the height control switch to turn off the height control.
      2. Drive the vehicle and check with the indicator that the height control is activated automatically.

        Standard value 

        STANDARD VALUE TABLE

        Vehicle Height Vehicle Speed
        HI More than 30 km/h (19 mph)
        N More than 80 km/h (50 mph)
        LO More than 30 km/h (19 mph)
  7. INSPECT PRESSURE VALUE OF FRONT SHOCK ABSORBER (IN CASE OF USING INTELLIGENT TESTER) 
    NOTE: Perform the operation with vehicle unloaded (with the fuel tank filled up).
    1. Connect the intelligent tester (with CAN VIM) to the DLC3 on the vehicle.
    2. Start the engine and push the height select switch to adjust the vehicle height to the "N".
    3. Push the height select switch to adjust the vehicle height from "N" to "LO", then back to "N".
      NOTE: Adjust it without passengers.
    4. Stop the engine.
    5. Read the pressure value of the front shock absorber with intelligent tester at this time.

      Pressure: 

      6.9 +/- 0.5 MPa (70 +/- 5 kgf/cm 2  , 996 +/- 71 psi) 

    6. Start the engine and push the height select switch to adjust the vehicle height to "N".
    7. Check the fluid level.
      Fig 7: Connecting Intelligent Tester To DLC3
      G04064541Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSPECT PRESSURE VALUE OF FRONT SHOCK ABSORBER (IN CASE OF NOT USING INTELLIGENT TESTER) 
    NOTE:
    • Perform the operation with the vehicle unloaded (with the fuel tank filled up).
    • After and before using LSPV gauge (SST) and adapter, make sure to clean the hose, gauge and adapter.
    1. Start the engine and push the height select switch to adjust the vehicle height to "LO".
    2. With the ignition switch OFF, discharge the suspension fluid AHC from the bleeder plug of the either front right or left wheel damping force control actuator.
      CAUTION: The fluid gushes out because of high pressure, so discharge the fluid in the same way as air bleeding.
    3. Remove the bleeder plug of either right or left damping force control actuator and install the LSPV gauge (SST).

      SST 09709-29018 

    4. Start the engine and push the height select switch to adjust the vehicle height to "N".
    5. Push the height select switch to adjust the vehicle height from "N" to "LO", then back to "N".
    6. Stop the engine.
    7. Read the pressure value of LSPV gauge (SST) at this time.
      Fig 8: Installing LSPV Gauge
      G04437417Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      SST 09709-29018 

      Pressure: 

      5.7 +/- 0.3 MPa (58 +/- 3 kgf/cm 2  , 825 +/- 43 psi) 

    8. Start the engine and push the height select switch to adjust the vehicle height to "LO".
    9. With the ignition switch OFF, discharge the suspension fluid AHC from the bleeder plug of LSPV gauge (SST).

      SST 09709-29018 

      CAUTION: The fluid gushes out because of high pressure, so discharge the fluid in the same way as air bleeding.
    10. Remove the LSPV gauge (SST).

      SST 09709-29018 

    11. Install the bleeder plug.

      Torque: 8.3 N*m (84 kgf*cm, 73 in.*lbf) 

    12. Bleed the air (see BLEEDING ).

      HINT:

      Bleed the bleeder plug with LSPV gauge (SST) installed to only once.

    13. Check the fluid level.
  9. INSPECT PRESSURE VALUE OF REAR SHOCK ABSORBER (IN CASE OF USING INTELLIGENT TESTER) 
    NOTE: Perform the operation with the vehicle unloaded (with the fuel tank filled up).
    1. Connect the intelligent tester to the DLC3 on the vehicle.
    2. Disconnect the fluid temperature sensor connector.
    3. Start the engine and push the height select switch to adjust the vehicle height from "N" to "LO", then back to "N".
      NOTE: Adjust it without passengers.
    4. Stop the engine.
    5. Read the pressure valve of the rear shock absorber with the intelligent tester at this time.

      Pressure: 

      5.6 to 6.7 MPa (57 to 68 kgf/cm 2  , 811 to 967 psi) 

      If the pressure is not within the specified range, its cause may be that a load object is either installed or removed.

      HINT:

      The cylinder pressure read by the intelligent tester is estimated by the pump emitted pressure so the pressure is approximately 1.2 MPa (12 kgf/cm2 , 171 psi) higher than the pressure read by the LSPV gauge (SST).

      Fig 9: Connecting Intelligent Tester To DLC3
      G04064541Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Connect the fluid temperature sensor connector.
    7. Check the DTC (see DTC CHECK/CLEAR  ).

      If the DTC is displayed, clear the DTC (see DTC CHECK/CLEAR  ).

    8. Start the engine and push the height select switch to adjust the vehicle height to "LO", then to "N". At this time, check that the 4 wheels are raised simultaneously.
  10. INSPECT PRESSURE VALUE OF REAR SHOCK ABSORBER (IN CASE OF NOT USING INTELLIGENT TESTER) 
    NOTE:
    • Perform the operation with the vehicle unloaded (with the fuel tank filled up).
    • After and before using LSPV gauge (SST) and adapter, make sure to clean the hose, gauge and adapter.
    1. Start the engine and push the height select switch to adjust the vehicle height to "LO".
    2. With the ignition switch OFF, discharge the suspension fluid AHC from the bleeder plug of the either rear right or left wheel damping force control actuator.
      CAUTION: The fluid gushes out because of high pressure, so discharge the fluid in the same way as air bleeding.
    3. Remove the bleeder plug of either right or left damping force control actuator and install the LSPV gauge (SST).
    4. Start the engine and push the height to "N".
    5. Push the height select switch to adjust the vehicle height from "N" to "LO", then back to "N".
    6. Stop the engine.
    7. Read the pressure value with LSPV gauge (SST) at this time.

      SST 09709-29018 

      Pressure: 

      4.4 to 5.5 MPa (45 to 56 kgf/cm 2  , 640 to 797 psi) 

      If the pressure is not within the specified range, its cause may be that a load object is either installed or removed.

      Fig 10: Inspecting Pressure Value Of Rear Shock Absorber
      G04437419Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Start the engine and push the height select switch to adjust the vehicle height to "LO".
    9. With the ignition switch OFF, discharge the suspension fluid AHC from the bleeder plug of LSPV gauge (SST).

      SST 09709-29018 

      CAUTION: The fluid gushes out because of high pressure, so discharge the fluid in the same way as air bleeding.
    10. Remove the LSPV gauge (SST).

      SST 09709-29018 

    11. Install the bleeder plug.

      Torque: 8.3 N*m (84 kgf*cm, 73 in.*lbf) 

    12. Bleed the air (see BLEEDING ).

      HINT:

      Bleed air from the bleeder plug with LSPV gauge (SST) installed only once.

    13. Check the fluid level.
  11. INSPECT FLUID LEAKAGE 
    1. Inspect the connections of tube and parts for fluid leakage.
      Fig 11: Inspecting Connections Of Tube
      G04437420Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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