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Home >> Lexus >> 2010 >> LS 600hL >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Air Suspension (Diagnostic Codes & Circuit Tests) >> Air Suspension System >> DTC C1711: Front Height Control Sensor RH Circuit Malfunction; DTC C1712: Front Height Control Sensor LH Circuit Malfunction; DTC C1713: Rear Height Control Sensor RH Circuit Malfunction; DTC C1714: Rear Height Control Sensor LH Circuit Malfunction >> Procedure

DTC C1711: Front Height Control Sensor RH Circuit Malfunction; DTC C1712: Front Height Control Sensor LH Circuit Malfunction; DTC C1713: Rear Height Control Sensor RH Circuit Malfunction; DTC C1714: Rear Height Control Sensor LH Circuit Malfunction: Procedure

  1. INSPECT HEIGHT CONTROL SENSOR 
    1. Check the front height control sensor.
      1. Remove the front height control sensor RH or front height control sensor LH. Refer to REMOVAL .
        NOTE:

        Do not drop the height control sensor. If it is dropped, replace it with a new one.

        Fig 1: Identifying Front Height Control Sensor Connector Terminal And Rotating Angle
        GTY109895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Connect 3 1.5 V dry cell batteries in series.
      3. Connect the positive (+) end of the batteries to terminal 3 (SHB) of the height control sensor and the negative (-) end of the batteries to terminal 1 (SHG). While slowly moving the sensor's link up and down, measure the voltage between terminal 2 (SHFR*1 or SHFL*2) and terminal 1 (SHG).

        HINT: 

        *1: for RH

        *2: for LH

      4. Measure the voltage according to the value(s) in the table below.

        Standard voltage

        FOR RH

        Tester Connection Condition Specified Condition
        2 (SHFR) - 1 (SHG) Max. HI Approx. 4.1 V
        Normal Approx. 2.25 V
        Min. LO Approx. 0.45 V
        FOR LH

        Tester Connection Condition Specified Condition
        2 (SHFL) - 1 (SHG) Max. HI Approx. 4.1 V
        Normal Approx. 2.25 V
        Min. LO Approx. 0.45 V
        NOTE:

        Do not apply a voltage of more than 6 V.

    2. Check the rear height control sensor.
      1. Remove the rear height control sensor RH or rear height control sensor LH. Refer to REMOVAL .
        NOTE:

        Do not drop the height control sensor. If it is dropped, replace it with a new one.

        Fig 2: Identifying Rear Height Control Sensor Connector Terminal And Rotating Angle
        GTY110838Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Connect 3 1.5 V dry cell batteries in series.
      3. Connect the positive (+) end of the batteries to terminal 3 (SHB) of the height control sensor and the negative (-) end of the batteries to terminal 1 (SHG). While slowly moving the sensor's link up and down, measure the voltage between terminal 2 (SHRR*1 or SHRL*2) and terminal 1 (SHG).

        HINT: 

        *1: for RH

        *2: for LH

      4. Measure the voltage according to the value(s) in the table below.

        Standard voltage

        FOR RH

        Tester Connection Condition Specified Condition
        2 (SHRR) - 1 (SHG) Max. HI Approx. 4.1 V
        Normal Approx. 2.25 V
        Min. LO Approx. 0.45 V
        FOR LH

        Tester Connection Condition Specified Condition
        2 (SHRL) - 1 (SHG) Max. HI Approx. 4.1 V
        Normal Approx. 2.25 V
        Min. LO Approx. 0.45 V
        NOTE:

        Do not apply a voltage of more than 6 V.

      RESULT

      Result Proceed to
      OK A
      Front height control sensor RH malfunction B
      Front height control sensor LH malfunction C
      Rear height control sensor RH malfunction D
      Rear height control sensor LH malfunction E

    E → See step   7 

    D → See step   6 

    C → See step   5 

    B → See step   4 

    A: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SENSOR - SUSPENSION CONTROL ECU) 
    1. Check the front height control sensor RH (C1731).
      1. Turn the power switch OFF.
      2. Disconnect the A39 and L88 ECU connectors.
      3. Disconnect the A54 sensor connector.
      4. Measure the resistance according to the value(s) in the table below.
        Fig 3: Disconnecting R1 ECU Connector
        GTY144264Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance

        Tester Connection Condition Specified Condition
        A54-1 (SHG) - L88-21 (SGR1) Always Below 1 Ω
        A54-2 (SHFR) - A39-20 (SHFR) Always Below 1 Ω
        A54-3 (SHB) - L88-20 (SBR1) Always Below 1 Ω
        A54-1 (SHG) or L88-21 (SGR1) - Body ground Always 10 kΩ or higher
        A54-2 (SHFR) or A39-20 (SHFR) - Body ground Always 10 kΩ or higher
        A54-3 (SHB) or L88-20 (SBR1) - Body ground Always 10 kΩ or higher
    2. Check the front height control sensor LH (C1732).
      1. Turn the power switch OFF.
      2. Disconnect the A39 and L88 ECU connectors.
      3. Disconnect the A4 sensor connector.
      4. Measure the resistance according to the value(s) in the table below.
        Fig 4: Identifying Suspension Control ECU Connector Terminal A39 And L88 And Front Control Sensor LH Connector Terminal A4
        GTY110824Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance

        Tester Connection Condition Specified Condition
        A4-1 (SHG) - L88-22 (SGL1) Always Below 1 Ω
        A4-2 (SHFL) - A39-22 (SHFL) Always Below 1 Ω
        A4-3 (SHB) - L88-18 (SBL1) Always Below 1 Ω
        A4-1 (SHG) or L88-22 (SGL1) - Body ground Always 10 kΩ or higher
        A4-2 (SHFL) or A39-22 (SHFL) - Body ground Always 10 kΩ or higher
        A4-3 (SHB) or L88-18 (SBL1) - Body ground Always 10 kΩ or higher
    3. Check the rear height control sensor RH (C1733).
      1. Turn the power switch OFF.
      2. Disconnect the R1 ECU connector.
      3. Disconnect the "A" sensor connector.
      4. Measure the resistance according to the value(s) in the table below.
        Fig 5: Identifying Suspension Control ECU Connector Terminal R1 And Rear Height Control Sensor Connector Terminal
        GTY110825Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance

        Tester Connection Condition Specified Condition
        "A"-1 (SHG) - R1-25 (SGR2) Always Below 1 Ω
        "A"-2 (SHRR) - R1-28 (SHRR) Always Below 1 Ω
        "A"-3 (SHB) - R1-26 (SBR2) Always Below 1 Ω
        "A"-1 (SHG) or R1-25 (SGR2) - Body ground Always 10 kΩ or higher
        "A"-2 (SHRR) or R1-28 (SHRR) - Body ground Always 10 kΩ or higher
        "A"-3 (SHB) or R1-26 (SBR2) - Body ground Always 10 kΩ or higher
    4. Check the rear height control sensor LH (C1734).
      1. Turn the power switch OFF.
      2. Disconnect the R1 ECU connector.
      3. Disconnect the "B" sensor connector.
      4. Measure the resistance according to the value(s) in the table below.
        Fig 6: Identifying Suspension Control ECU Connector Terminal R1 And Rear Height Control Sensor Connector Terminal
        GTY110826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard resistance

        Tester Connection Condition Specified Condition
        "B"-1 (SHG) - R1-23 (SGL2) Always Below 1 Ω
        "B"-2 (SHRL) - R1-30 (SHRL) Always Below 1 Ω
        "B"-3 (SHB) - R1-24 (SBL2) Always Below 1 Ω
        "B"-1 (SHG) or R1-23 (SGL2) - Body ground Always 10 kΩ or higher
        "B"-2 (SHRL) or R1-30 (SHRL) - Body ground Always 10 kΩ or higher
        "B"-3 (SHB) or R1-24 (SBL2) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   3 

  3. REPLACE SUSPENSION CONTROL ECU. Refer to  REMOVAL 
  4. REPLACE FRONT HEIGHT CONTROL SENSOR RH. Refer to  REMOVAL 
  5. REPLACE FRONT HEIGHT CONTROL SENSOR LH. Refer to  REMOVAL 
  6. REPLACE REAR HEIGHT CONTROL SENSOR RH. Refer to  REMOVAL 
  7. REPLACE REAR HEIGHT CONTROL SENSOR LH. Refer to  REMOVAL 
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