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Section 280 (Air Suspension System - Diagnosis): Pre-Check

WARNING: This page is about a different car, the 2004 Lexus RX 330. However, it is still accessible from the selected car via links, so may be relevant.
  1. DIAGNOSIS SYSTEM 
    1. Inspect the battery voltage.
      1. Battery voltage: 11 to 14V 

      If the voltage is below 11 V, recharge the battery before proceeding.

      Fig 1: Identifying DLC3 Terminals
      G01395529Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check DLC3.

      The vehicle's suspension control ECU uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

      Verify the conditions listed in Fig 2 :

      Fig 2: DLC3 Terminals Connection/Voltage Or Resistance Chart
      G01395530Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      If the hand-held tester display shows UNABLE TO CONNECT TO VEHICLE when the cable of the hand-held tester is connected to DLC3, the ignition switch is turned to the ON position and the tester is operated, there is a problem on the vehicle side or tester side.

      • If communication is normal when the tester is connected to another vehicle, inspect DLC3 on the original vehicle.
      • If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tester itself, so consult the Service Department listed in the tester's instruction manual.
    3. Indicator lamp
      1. During the vehicle height control operation, the height control OFF indicator lamp blinks when there is any malfunction in the Air Suspension System.
      Fig 3: Identifying Height Control OFF Indicator Lamp
      G01395531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • When the malfunction has been corrected, the height control OFF indicator lamp does not come on.
      • The height control OFF indicator lamp does not illuminate when all problems occur (See DIAGNOSTIC TROUBLE CODE CHART  for the items that make the height control OFF indicate lamp comes on).
    4. DTCs (Normal mode)
      1. DTCs are memorized in the suspension control ECU and read by the blinks of the height control OFF indicator lamp or using the hand-held tester (See PRE-CHECK  for the procedure of DTCs check).
    5. Test mode
      1. By switching from normal mode into test mode (input signal check), you can inspect the stop lamp switch assy, rear speed sensor, height control switch, height control OFF switch, engine speed signal, access mode switch (See  7 ).
  2. CHECK INDICATOR Lamp 
    1. Turn the ignition switch to the ON position.
    2. Check that the height control OFF indicator lamp, height control indicator lamp and the access mode indicator lamp come on for 2 sec.

    If the indicator check result is not normal, proceed to the troubleshooting for the indicator lamp circuit.

    Trouble Area See
    Height control indicator lamp circuit HEIGHT CONTROL INDICATOR LAMP CIRCUIT 
    Height control OFF indicator limp circuit HEIGHT CONTROL OFF INDICATOR LAMP CIRCUIT 
    Access mode indicator lamp circuit ACCESS MODE INDICATOR LAMP CIRCUIT 
  3. DTC CHECK (USING SST CHECK WIRE) 
    1. Check DTCs.
      1. Using the SST(s), connect terminals TC and CG of DLC3.
        1. SST 09843-18040
        2. Fig 4: Identifying DLC3 Terminals
        G01395534Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Turn the ignition switch to the ON position.
      3. Read and record any DTCs from the height control OFF indicator lamp on the combination meter. Refer to Fig 6 for examples of a normal code and codes 13 and 33.
        Fig 5: Identifying Height Control OFF Indicator Lamp
        G01395536Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Fig 6: Blinking Pattern Of Height Control OFF Indicator Lamp
        G01395537Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        • If the height control OFF indicator lamp does not blink any DTC codes or the normal code, inspect the height control OFF indicator lamp circuit or TC terminal circuit.
          Trouble Area See
          Height control OFF indicator lamp circuit HEIGHT CONTROL OFF INDICATOR LAMP CIRCUIT 
          TC terminal circuit TC TERMINAL CIRCUIT 
        • If 2 or more malfunctions are indicated at the same time, the lowest numbered DTC is displayed first.
      4. Refer to the Diagnostic Trouble Code Chart (See DIAGNOSTIC TROUBLE CODE CHART  ) for DTC information.
      5. After completing the check, remove the SST(s) from DLC3.
        1. SST 09843-18040
    2. Clear the DTCs.
      1. Make sure the ignition switch is OFF.
      2. Using the SST(s), connect terminals TC and CG of DLC3.
        1. SST 09843-18040
        3. Fig 7: Identifying DLC3 Terminals
        G01395538Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Turn the ignition switch to the ON position.
      4. Clear the DTCs stored in the ECU by depressing the brake pedal 8 times or more within 5 sec.
        5. Fig 8: Depressing Brake Pedal
        G01395539Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Check that the height control OFF indicator lamp blinks a normal code.

        HINT:

        If the fault has not been repaired, the DTC code may still be displayed.

      6. Turn the ignition switch to the OFF position.
      7. Remove SST(s) from DLC3.
        1. SST 09843-18040

        HINT:

        Disconnecting the battery cable during the operation will not erase DTCs in the ECU.

  4. DTC CHECK (USING HAND-HELD TESTER) 
    1. Check DTCs.
      1. Connect the hand-held tester to DLC3.
        2. Fig 9: Connecting Hand-Held Tester To DLC3
        G01395540Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Turn the ignition switch to the ON position.
      3. Read the DTCs by following the prompts on the tester screen.

      HINT:

      Refer to the hand-held tester operator's manual for further details.

    2. Clear the DTCs using the hand-held tester.

      HINT:

      After repairing the malfunctions, clear the DTC.

      1. Connect the hand-held tester to DLC3.
      2. Turn the ignition switch to the ON position.
      3. Erase the DTCs by following the prompts on the tester screen.

      HINT:

      Refer to the hand-held tester operator's manual for further details.

  5. DATA LIST 
    1. Connect the hand-held tester to DLC3.
    2. Turn the ignition switch to the ON position.
    3. Following the display on the hand-held tester, read the "DATA LIST".
    Fig 10: Data List (1 Of 3)
    G01395541Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 11: Data List (2 Of 3)
    G01395542Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 12: Data List (3 Of 3)
    G01395543Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. ACTIVE TEST LIST 
    1. Connect the hand-held tester to DLC3.
    2. Turn the ignition switch to the ON position.
    3. Following the display on the hand-held tester, read the "ACTIVE TEST".
    Fig 13: Active Test List
    G01395544Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. TEST MODE CHECK (USING SST CHECK WIRE) 

    HINT:

    • When entering the test mode, the suspension control ECU sets all the test DTCs first.

      After completing the input signal operation for each inspection item, the DTCs that are judged normal by the suspension control ECU will be erased.

      The DTCs for other inspection items may not be erased when only a certain signal is inspected.

    • When the test mode returns back to the normal mode, all the test DTCs will be erased.
    1. Procedure for Test Mode.
      1. Make sure that the ignition switch is off.
      2. Set each of the check items in the table below to the condition in Operation (A).
      3. Using the SST(s), connect the terminals TS and CG of DLC3.
        1. SST 09843-18040
        4. Fig 14: Identifying DLC3 Terminals
        G01395545Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Turn the ignition switch to the ON position.
      5. Check that the height control OFF indicator lamp comes on and goes off at 0.125 second intervals. (4 Hz).
        Fig 15: Identifying Height Control OFF Indicator Lamp
        G01395547Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        If the height control OFF indicator lamp does not blink, inspect the height control OFF indicator lamp circuit or the TS terminal circuit.

        Trouble Area See
        Height control OFF indicator lamp circuit HEIGHT CONTROL OFF INDICATOR LAMP CIRCUIT 
        TS terminal circuit TS TERMINAL CIRCUIT 
      6. Set each of the check items to the condition in Operation (B). See Fig 17.

        HINT:

        • When checking each item, the height control OFF indicator lamp should come on for 1 sec. then continue blinking.
          • Fig 16: Blinking Pattern Of Height Control OFF Indicator Lamp
          G01395548Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • There is no input signal order.

        Test mode table: 

        Fig 17: Test Mode Table
        G01395549Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      7. Using the SST(s), connect the 3rd terminal of the SST to terminal TC in the DLC3.
        1. SST 09843-18040
        Fig 18: Identifying DLC3 Terminals
        G01395550Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      8. Read the number of blinks of the height control OFF indicator lamp.
        Fig 19: Identifying Height Control OFF Indicator Lamp
        G01395551Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        • As an example, the blinking patterns of a normal code and code 82 are shown in Fig 20 .
          Fig 20: Blinking Patterns Of Normal Code And Code 82
          G01395552Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        • If 2 or more malfunctions are indicated at the same time, the lowest numbered code is displayed first.
        • When a DTC or normal code is not output, check the TC terminal circuit on TC TERMINAL CIRCUIT  .
      9. Check the malfunction using the code table below.
    2. Clear the test DTCs and return to normal mode.

      HINT:

      After repairing the malfunctions, clear the test DTC.

      1. Turn the ignition switch off.
      2. Disconnect the SST(s) from the terminals of DLC3.
        1. SST 09843-18040
      3. Turn the ignition switch to the ON position.
  8. TEST MODE CHECK (HAND-HELD TESTER) 

    HINT:

    • When entering the test mode, the suspension control ECU sets all the test DTCs first.

      After completing the input signal operation for each inspection item, the DTCs that are judged normal by the suspension control ECU will be erased.

      The DTCs for other inspection items may not be erased when only a certain signal is inspected.

    • When the test mode returns back to the normal mode, all the test DTCs will be erased.
    1. Procedure for Test Mode.
      1. Make sure that the ignition switch is off.
      2. Set each of the check items in the table below to the condition in Operation (A) in the test mode table.
      3. Connect the hand-held tester to DLC3.
        4. Fig 21: Connecting Hand-Held Tester To DLC3
        G01395553Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Turn the ignition switch to the ON position.
      5. Select the SIGNAL CHECK mode on the hand-held tester.
      6. Set each of the check items to the condition in Operation (B) in the test mode table. See Fig 17.

        HINT:

        In step (6), all signals can be checked together.

      7. Read the DTCs by following the prompts on the tester screen.

        HINT:

        Refer to the hand-held tester operator's manual for further details.

      8. After completing the input signal check, disconnect the tester and turn the ignition switch off.

      DTC of Air Suspension System test mode function: 

      If a malfunction code is displayed during the test mode DTC check, check the circuit listed for that code.

      Fig 22: Air Suspension System Test Mode Function DTC Chart
      G01395554Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. ADJUST VEHICLE HEIGHT (WHEN USING HAND-HELD TESTER) 

    HINT:

    Leave the driver's seat window open to make height control operation easier.

    1. Start the engine.
    2. Change the height control switch to the "N" position.
      3. Fig 23: Identifying Height Control Switch
      G01395555Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check that the blinking for the "N" lamp in the combination meter is on.
    4. Push the access mode switch to the off position.
    5. Stop the engine and turn the ignition switch OFF.
    6. Check the vehicle height (calculated value).

      HINT:

      Refer to Fig 24.

      Fig 24: Checking Vehicle Height
      G01395557Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 25: Vehicle Height Chart
      G01395556Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. A: Ground clearance of lower front suspension arm No.2 bush set bolt center.
      2. B: Ground clearance of front wheel center.
      3. C: Ground clearance of strut rod set bolt center.
      4. D: Ground clearance of rear wheel center.
    7. If the value of the vehicle height is not within the range of the standard value, note the value measured and proceed to the following step.

      Standard value table: 

      Fig 26: Standard Value Table
      G01395558Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      The difference between the right and the left sides should be less than 10 mm (0.39 in.). 

      NOTE: In the case where the difference between the value of the vehicle height and standard value exceeds 80 mm (3.15 in.), this check cannot be performed by using the hand-held tester, In order to perform the check with the hand-held tester, adjust the difference below 80 mm (3.15 in.) without using the hand-held tester. Check the height control sensor sub-assy (See DTC C1711/11 RIGHT FRONT HEIGHT CONTROL SENSOR CIRCUIT, DTC C1712/12 LEFT FRONT HEIGHT CONTROL SENSOR CIRCUIT,  DTC C1713/13 RIGHT REAR HEIGHT CONTROL SENSOR CIRCUIT, DTC C1714/14 LEFT REAR HEIGHT CONTROL SENSOR C).
    8. Connect the hand-held tester to DLC3.
    9. Turn the ignition switch to the ON position.
      Fig 27: Connecting Hand-Held Tester To DLC3
      G01395559Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. Perform the height offset procedure from the AIRSUS menu.
      Fig 28: AIRSUS menu - Height Offset Procedure
      G01395560Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. Start the engine.
    12. Change the height control switch to the "HI" position and check that the blinking for the "HI" lamp on the meter has been changed to the illuminating.
      13. Fig 29: Identifying Height Control Switch Positions
      G01395561Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    13. Change the height control switch to the "N" position again and get out of the vehicle immediately while the "N" lamp is blinking.
      NOTE: Be sure to get out of the vehicle while the lamp is blinking as the height will be changed and the value will not be measured properly if you fail to do so.
    14. Turn the ignition switch to the OFF position from outside of the vehicle after the "N" lamp comes on.
      NOTE: Do not touch the vehicle as its height may be changed.
    15. Check the vehicle height again to confirm the value of the vehicle height is within the range of the standard values.
  10. ADJUST VEHICLE HEIGHT (WHEN NOT USING HAND-HELD TESTER) 
    1. Start the engine.
    2. Change the height control switch to the "N" position.
    3. Check that the blinking for the "N" lamp on the meter has been changed to the illuminating.
    4. Stop the engine and turn the ignition switch OFF.
      Fig 30: Identifying Height Control Switch Positions
      G01395562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Check the vehicle height (calculated value).
      Fig 31: Checking Vehicle Height
      G01395564Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      Leave the driver's seat window open to make height control operation easier.

      1. A: Ground clearance of lower suspension arm No.2 bush set bolt center.
      2. B: Ground clearance of front wheel center.
      3. C: Ground clearance of strut rod set bolt center.
      4. D: Ground clearance of rear wheel center.
    6. If the value of the vehicle height is not within the range of the standard value, note the value measured and proceed to the following step.

      Standard value table: 

      Fig 32: Standard Values Table
      G01395563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Difference between the right and the left sides should be less than 10 mm (0.39 in.). 

    7. Adjust the front vehicle height control sensor links.
      Fig 33: Adjusting Front Vehicle Height Control Sensor Links
      G01395565Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Adjust the link of which the value for the vehicle height control is most beyond the range of the standard value first.
      • If the values of the front vehicle height and the rear vehicle height are the same, adjust the front vehicle height control sensor link first.
      1. Loosen the nut and adjust the link position by moving it up and down along the bracket's hole on the vehicle.

        HINT:

        The vehicle height will be changed by approx. 5 mm (0.19 in.) when changing the link by approx. 1 mm (0.04 in.).

      2. Tighten the nut on the vehicle height control sensor link.
      1. Torque: 5.4 N.m (55 kgf.cm, 48 in..lbf) 
    8. Adjust the rear vehicle height control sensor links.
      1. Loosen the 2 lock-nuts on the vehicle height control sensor link and turn the link to adjust its length.
        Fig 34: Adjusting Rear Vehicle Height Control Sensor Links
        G01395566Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        • Lengthen the link to raise the vehicle height.
        • Shorten the link to lower the vehicle height.
        • 2WD:

          The vehicle height will be changed by approx. 8 mm (0.31 in.) when turning the rear vehicle height control sensor link around once.

        • 4WD:

          The vehicle height will be changed by approx. 3 mm (0.12 in.) when turning the rear vehicle height control sensor link around once.

      2. Check if the vehicle height control sensor link dimension (A) shown in Fig 35 is shorter than the standard value.
        Fig 35: Identifying Vehicle Height Control Sensor Link Dimension
        G01395567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard length: 18.0 mm (0.708 in.) or less 

      3. Tighten the 2 lock-nuts on the vehicle height control sensor link.

        Torque: 5.4 N.m (55 kgf.cm, 48 in..lbf) 

    9. Check the vehicle height again to confirm the value of the vehicle height is within the range of the standard value.
    10. Adjust the headlight aim only (See PRE-CHECK ).
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