ACTIVE HEIGHT CONTROL SUSPENSION, 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 SHB terminal of the height control sensor. If the sensor resistance value changes, the sensor voltage value changes accordingly. The suspension control ECU then receives the voltage value from the sensor to detect the vehicle height change.

DTC Code Detection Condition Trouble Area
C1711

When one of the following conditions is met:


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

  • When there is a height control sensor power supply voltage malfunction.

  • When the height control sensor is determined to be stuck (When the sensor output is constant while the vehicle is turning, the sensor is determined to be stuck).

  • Harness or connector

  • Front height control sensor RH

  • Suspension control ECU
C1712

When one of the following conditions is met:


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

  • When there is a height control sensor power supply voltage malfunction.

  • When the height control sensor is determined to be stuck (When the sensor output is constant while the vehicle is turning, the sensor is determined to be stuck).

  • Harness or connector

  • Front height control sensor LH

  • Suspension control ECU
C1713

When one of the following conditions is met:


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

  • When there is a height control sensor power supply voltage malfunction.

  • When the height control sensor is determined to be stuck (When the sensor output is constant while the vehicle is turning, the sensor is determined to be stuck).

  • Harness or connector

  • Rear height control sensor RH

  • Suspension control ECU
C1714

When one of the following conditions is met:


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

  • When there is a height control sensor power supply voltage malfunction.

  • When the height control sensor is determined to be stuck (When the sensor output is constant while the vehicle is turning, the sensor is determined to be stuck).

  • Harness or connector

  • Rear height control sensor LH

  • Suspension control ECU

WIRING DIAGRAM

A0159ULE07

INSPECTION PROCEDURE

Note


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

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

PROCEDURE


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

    Note

    When inspecting the wire harnesses between the suspension control ECU and each sensor, it is difficult to determine the malfunctioning area if there is a sensor power supply malfunction. Therefore, disconnect each sensor connector (front RH, front LH, rear RH and rear LH) on the ECU side.


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


      1. Disconnect the K35 and K36 ECU connectors.

      2. Disconnect the z34 sensor connector.

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

        A0155OAE01
        Standard Resistance
        Tester Connection Condition Specified Condition
        z34-1 (SHG) - K35-12 (SHG1) Always Below 1 Ω
        z34-2 (SHFR) - K36-26 (SHFR) Always Below 1 Ω
        z34-3 (SHB) - K35-15 (SHB1) Always Below 1 Ω
        z34-1 (SHG) - Body ground Always 10 kΩ or higher
        z34-2 (SHFR) - Body ground Always 10 kΩ or higher
        z34-3 (SHB) - Body ground Always 10 kΩ or higher

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


      1. Disconnect the K35 and K36 ECU connectors.

      2. Disconnect the z35 sensor connector.

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

        A0155OAE05
        Standard Resistance
        Tester Connection Condition Specified Condition
        z35-1 (SHG) - K36-15 (SHG2) Always Below 1 Ω
        z35-2 (SHFL) - K35-21 (SHFL) Always Below 1 Ω
        z35-3 (SHB) - K36-14 (SHB2) Always Below 1 Ω
        z35-1 (SHG) - Body ground Always 10 kΩ or higher
        z35-2 (SHFL) - Body ground Always 10 kΩ or higher
        z35-3 (SHB) - Body ground Always 10 kΩ or higher

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


      1. Disconnect the K35 and K36 ECU connectors.

      2. Disconnect the N5 sensor connector.

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

        A015AVME01
        Standard Resistance
        Tester Connection Condition Specified Condition
        N5-3 (SHG) - K36-20 (SHG3) Always Below 1 Ω
        N5-2 (SHRR) - K36-24 (SHRR) Always Below 1 Ω
        N5-1 (SHB) - K36-13 (SHB3) Always Below 1 Ω
        N5-3 (SHG) - Body ground Always 10 kΩ or higher
        N5-2 (SHRR) - Body ground Always 10 kΩ or higher
        N5-1 (SHB) - Body ground Always 10 kΩ or higher

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


      1. Disconnect the K35 and K36 ECU connectors.

      2. Disconnect the N7 sensor connector.

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

        A015AVME02
        Standard Resistance
        Tester Connection Condition Specified Condition
        N7-3 (SHG) - K36-19 (SHG4) Always Below 1 Ω
        N7-2 (SHRL) - K36-27 (SHRL) Always Below 1 Ω
        N7-1 (SHB) - K36-25 (SHB4) Always Below 1 Ω
        N7-3 (SHG) - Body ground Always 10 kΩ or higher
        N7-2 (SHRL) - Body ground Always 10 kΩ or higher
        N7-1 (SHB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. 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 Click here.

        Note

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

        A0155Z9E01

      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 link up and down, measure the voltage between terminal 2 (SHFR*1 or SHFL*2) and terminal 1 (SHG).

        Note

        Do not apply a voltage of higher than 6 V.

        Tech Tips

        *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

    2. Check the rear height control sensor.


      1. Remove the rear height control sensor RH or rear height control sensor LH Click here.

        Note

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

        A015CPSE01

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

      3. Connect the positive (+) end of the batteries to terminal 1 (SHB) of the height control sensor and the negative (-) end of the batteries to terminal 3 (SHG). While slowly moving the sensor link up and down, measure the voltage between terminal 2 (SHRR*1 or SHRL*2) and terminal 3 (SHG).

        Note

        Do not apply a voltage of higher than 6 V.

        Tech Tips

        *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) - 3 (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) - 3 (SHG) Max. HI Approx. 4.1 V
        Normal Approx. 2.25 V
        Min. LO Approx. 0.45 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

    B

    REPLACE FRONT HEIGHT CONTROL SENSOR RH Click here

    C

    REPLACE FRONT HEIGHT CONTROL SENSOR LH Click here

    D

    REPLACE REAR HEIGHT CONTROL SENSOR RH Click here

    E

    REPLACE REAR HEIGHT CONTROL SENSOR LH Click here

    A

    REPLACE SUSPENSION CONTROL ECU Click here