AIR SUSPENSION SYSTEM, Diagnostic DTC:C1713, C1714

DTC Code DTC Name
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 resistance value of the sensor changes, the voltage value of the sensor changes accordingly. The suspension control ECU then inputs the voltage value from the sensor to detect the vehicle height change.

DTC Code DTC Detection Condition Trouble Area
C1713

Either condition is met:


  • With the ignition switch ON, a voltage of 5.5 V or higher or 4.3 V or less at the power source of the rear height control sensor RH is detected for 0.5 seconds.

  • With the ignition switch ON, 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.

  • Harness or connector

  • Rear height control sensor RH

  • Suspension control ECU
C1714

Either condition is met:


  • With the ignition switch ON, a voltage of 5.5 V or higher or 4.3 V or less at the power source of the rear height control sensor LH is detected for 0.5 seconds.

  • With the ignition switch ON, 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.

  • Harness or connector

  • Rear height control sensor LH

  • Suspension control ECU

WIRING DIAGRAM

B001G3CE09
*a Rear Height Control Sensor LH
*b Rear Height Control Sensor RH
*c Suspension Control ECU

CAUTION / NOTICE / HINT

Note

When replacing the suspension control ECU, perform registration Click here.

PROCEDURE


  1. INSPECT REAR HEIGHT CONTROL SENSOR

    B001DCCE15
    Text in Illustration
    *A for RH *B for LH
    *1 Rear Height Control Sensor - -
    *a

    Component without harness connected

    (Rear Height Control Sensor)

    		 *b Min. Low
    *c Normal *d Max. High
    B001CHY 45° B001DEF 45°

    1. Check the rear height control sensor RH (when DTC C1713 is output).


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

      2. Connect 3 dry cell batteries of 1.5 V 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) and terminal 3 (SHG).

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        3 (SHG) - 2 (SHRR) Max. High (45°) 4.4 to 4.6 V
        Normal (0°) 2.3 to 2.6 V
        Min. Low (-45°) 0.4 to 0.6 V

        Note

        Do not apply a voltage of 5 V or higher.

    2. Check the rear height control sensor LH (when DTC C1714 is output).


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

      2. Connect 3 dry cell batteries of 1.5 V 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 (SHRL) and terminal 3 (SHG).

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        3 (SHG) - 2 (SHRL) Max. High (45°) 4.4 to 4.6 V
        Normal (0°) 2.3 to 2.6 V
        Min. Low (-45°) 0.4 to 0.6 V

        Note

        Do not apply a voltage of 5 V or higher.

      Result
      Result Proceed to
      OK A
      NG (Rear height control sensor RH) B
      NG (Rear height control sensor LH) C

    B

    REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Click here

    C

    REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH Click here

    A

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


    1. Check the rear height control sensor RH (when DTC C1713 is output).


      1. Disconnect the S3 rear height control sensor RH connector.

      2. Disconnect the R19 suspension control ECU connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        S3-3 (SHG) - R19-16 (SGR2) Always Below 1 Ω
        S3-2 (SHRR) - R19-26 (SHRR) Always Below 1 Ω
        S3-1 (SHB) - R19-13 (SBR2) Always Below 1 Ω
        S3-3 (SHG) - Body ground Always 10 kΩ or higher
        S3-2 (SHRR) - Body ground Always 10 kΩ or higher
        S3-1 (SHB) - Body ground Always 10 kΩ or higher

    2. Check the rear height control sensor LH (when DTC C1714 is output).


      1. Disconnect the S6 rear height control sensor LH connector.

      2. Disconnect the R19 suspension control ECU connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        S6-3 (SHG) - R19-15 (SGL2) Always Below 1 Ω
        S6-2 (SHRL) - R19-24 (SHRL) Always Below 1 Ω
        S6-1 (SHB) - R19-14 (SBL2) Always Below 1 Ω
        S6-3 (SHG) - Body ground Always 10 kΩ or higher
        S6-2 (SHRL) - Body ground Always 10 kΩ or higher
        S6-1 (SHB) - Body ground Always 10 kΩ or higher

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR