AIR SUSPENSION SYSTEM, Diagnostic DTC:C1711, C1712, C1713, C1714

DTC Code DTC Name
C1711 Front Height Control Sensor RH Circuit Malfunction
C1712 Front Height Control Sensor LH Circuit Malfunction
C1713 Rear Height Control Sensor RH Circuit Malfunction
C1714 Rear Height Control Sensor LH Circuit Malfunction

DESCRIPTION

The height control sensor changes its resistance value based on changes in vehicle height. The suspension control ECU outputs a fixed voltage of 5 V to the height control sensor's SHB terminal. If the sensor's resistance value changes, the sensor's voltage value changes accordingly. The suspension control ECU then inputs the voltage value from the sensor to detect the vehicle height change.

DTC No. DTC Detection Condition Trouble Area
C1711

When either of the following is detected:


  • With the power switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor front RH is detected for 0.5 second.

  • With the power switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor front RH is detected for 1 second.

  • Wire harness or connector

  • Height control sensor front RH

  • Suspension control ECU
C1712

When either of the following is detected:


  • With the power switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor front LH is detected for 0.5 second.

  • With the power switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor front LH is detected for 1 second.

  • Wire harness or connector

  • Height control sensor front LH

  • Suspension control ECU
C1713

When either of the following is detected:


  • With the power switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor rear RH is detected for 0.5 second.

  • With the power switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor rear RH is detected for 1 second.

  • Wire harness or connector

  • Height control sensor rear RH

  • Suspension control ECU
C1714

When either of the following is detected:


  • With the power switch on (IG), a voltage of 5.5 V or more, or 4.3 V or less at power source of height control sensor rear LH is detected for 0.5 second.

  • With the power switch on (IG), a voltage of 4.7 V or more, or 0.3 V or less at height control sensor rear LH is detected for 1 second.

  • Wire harness or connector

  • Height control sensor rear LH

  • Suspension control ECU

WIRING DIAGRAM

A01NGNQE10

INSPECTION PROCEDURE

Note


  • Before performing troubleshooting, inspect the connectors of related circuits.

  • If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first Click here.

  • Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation Click here; 2) DTC inspection Click here; and 3) Intelligent tester inspection (Data List or Active Test) Click here. If no malfunctions are found in other areas, replace the suspension control ECU.

  • If the suspension control ECU is replaced, the vehicle height offset calibration and registration of vehicle identification information must be performed Click here and Click here

  • If the height control sensor is replaced, the vehicle height offset calibration must be performed Click here.

PROCEDURE


  1. INSPECT HEIGHT CONTROL SENSOR


    1. Check the front height control sensor:


      1. Disconnect the height control sensor front RH connector or height control sensor front LH connector.

        Note

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

        A01NHDCE03

      2. Connect 3 1.5 V dry cell batteries in series.

      3. Connect a positive (+) lead from the battery to terminal 3 (SHB) of the height control sensor and a negative (-) lead to terminal 1 (SHG). While applying 4.5 V, slowly moving the sensor's link up and down, and measure the voltage between terminal 2 (SHFR*2 or SHFL*3) and terminal 1 (SHG).

        Tech Tips

        *1: for RH

        *2: for LH

        Standard voltage
        for RH
        Tester Connection Condition Specified Condition
        2 (SHFR) - 1 (SHG) Max. HI 3.95 to 4.15 V
        Normal 2.15 to 2.35 V
        Min. LO 0.35 to 0.55 V
        for LH
        Tester Connection Condition Specified Condition
        2 (SHFL) - 1 (SHG) Max. HI 3.95 to 4.15 V
        Normal 2.15 to 2.35 V
        Min. LO 0.35 to 0.55 V
        Text in Illustration
        *1

        Component without harness connected

        (Height Control Sensor Front)

        Note

        Do not apply a voltage of more than 6 V.

    2. Check the rear height control sensor:


      1. Disconnect the height control sensor rear RH connector or height control sensor rear LH connector.

        Note

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

        A01NE37E02

      2. Connect 3 1.5 V dry cell batteries in series.

      3. Connect a positive (+) lead from the battery to terminal 3 (SHB) of the height control sensor and a negative (-) lead to terminal 1 (SHG). While applying 4.5 V, slowly moving the sensor's link up and down, and measure the voltage between terminal 2 (SHRR*2 or SHRL*3) and terminal 1 (SHG).

        Tech Tips

        *1: for RH

        *2: for LH

        Standard voltage
        for RH
        Tester Connection Condition Specified Condition
        2 (SHRR) - 1 (SHG) Max. HI 3.95 to 4.15 V
        Normal 2.15 to 2.35 V
        Min. LO 0.35 to 0.55 V
        for LH
        Tester Connection Condition Specified Condition
        2 (SHRL) - 1 (SHG) Max. HI 3.95 to 4.15 V
        Normal 2.15 to 2.35 V
        Min. LO 0.35 to 0.55 V
        Text in Illustration
        *1

        Component without harness connected

        (Height Control Sensor Rear)

        Note

        Do not apply a voltage of more than 6 V.

      Result
      Condition Proceed to
      OK A
      Height control sensor front RH malfunction B
      Height control sensor front LH malfunction C
      Height control sensor rear RH malfunction D
      Height control sensor rear LH malfunction E

    B

    REPLACE HEIGHT CONTROL SENSOR FRONT RH Click here

    C

    REPLACE HEIGHT CONTROL SENSOR FRONT LH Click here

    D

    REPLACE HEIGHT CONTROL SENSOR REAR RH Click here

    E

    REPLACE HEIGHT CONTROL SENSOR REAR LH Click here

    A

  2. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SENSOR - SUSPENSION CONTROL ECU)


    1. Check the height control sensor front RH side: (C1711)


      1. Turn the power switch off.

      2. Disconnect the A55 ECU connectors.

      3. Disconnect the A39 sensor connector.

      4. A01NGJ5E05
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Height Control Sensor Front RH)
        *2

        Rear view of wire harness connector

        (to Suspension Control ECU)

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

        Standard resistance
        Tester Connection Condition Specified Condition
        A39-1 (SHG) - A55-12 (SHG1) Always Below 1 Ω
        A39-2 (SHFR) - A55-20 (SHFR) Always Below 1 Ω
        A39-3 (SHB) - A55-13 (SHB1) Always Below 1 Ω
        A55-12 (SHG1) - Body ground Always 10 kΩ or higher
        A55-20 (SHFR) - Body ground Always 10 kΩ or higher
        A55-13 (SHB1) - Body ground Always 10 kΩ or higher

    2. Check the height control sensor front LH side: (C1712)


      1. Turn the power switch off.

      2. Disconnect the A55 ECU connectors.

      3. Disconnect the A38 sensor connector.

      4. A01NGJ5E06
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Height Control Sensor Front LH)
        *2

        Rear view of wire harness connector

        (to Suspension Control ECU)

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

        Standard resistance
        Tester Connection Condition Specified Condition
        A38-1 (SHG) - A55-11 (SHG2) Always Below 1 Ω
        A38-2 (SHFL) - A55-24 (SHFL) Always Below 1 Ω
        A38-3 (SHB) - A55-14 (SHB2) Always Below 1 Ω
        A55-11 (SHG2) - Body ground Always 10 kΩ or higher
        A55-24 (SHFL) - Body ground Always 10 kΩ or higher
        A55-14 (SHB2) - Body ground Always 10 kΩ or higher

    3. Check the height control sensor rear RH side: (C1713)


      1. Turn the power switch off.

      2. Disconnect the A54 ECU connector.

      3. Disconnect the R4 sensor connector.

      4. A01NGMQE03
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Height Control Sensor Rear RH)
        *2

        Rear view of wire harness connector

        (to Suspension Control ECU)

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

        Standard resistance
        Tester Connection Condition Specified Condition
        R4-1 (SHG) - A54-15 (SHG3) Always Below 1 Ω
        R4-2 (SHRR) - A54-24 (SHRR) Always Below 1 Ω
        R4-3 (SHB) - A54-14 (SHB3) Always Below 1 Ω
        A54-15 (SHG3) - Body ground Always 10 kΩ or higher
        A54-24 (SHRR) - Body ground Always 10 kΩ or higher
        A54-14 (SHB3) - Body ground Always 10 kΩ or higher

    4. Check the height control sensor rear LH side: (C1714)


      1. Turn the power switch off.

      2. Disconnect the A54 ECU connector.

      3. Disconnect the R2 sensor connector.

      4. A01NGMQE04
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Height Control Sensor Rear LH)
        *2

        Rear view of wire harness connector

        (to Suspension Control ECU)

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

        Standard resistance
        Tester Connection Condition Specified Condition
        R2-1 (SHG) - A54-16 (SHG4) Always Below 1 Ω
        R2-2 (SHRL) - A54-26 (SHRL) Always Below 1 Ω
        R2-3 (SHB) - A54-13 (SHB4) Always Below 1 Ω
        A54-16 (SHG4) - Body ground Always 10 kΩ or higher
        A54-26 (SHRL) - Body ground Always 10 kΩ or higher
        A54-13 (SHB4) - Body ground Always 10 kΩ or higher
        Result
        Condition Proceed to
        OK (for LHD) A
        OK (for RHD) B
        NG C

    B

    REPLACE SUSPENSION CONTROL ECU (for RHD) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE SUSPENSION CONTROL ECU (for LHD) Click here