AIR SUSPENSION SYSTEM, Diagnostic DTC:C171112, C171212, C171312, C171412

DTC Code DTC Name
C171112 Front Height Control Sensor RH Circuit Circuit Short to Battery
C171212 Front Height Control Sensor LH Circuit Circuit Short to Battery
C171312 Rear Height Control Sensor RH Circuit Circuit Short to Battery
C171412 Rear Height Control Sensor LH Circuit Circuit Short to Battery

DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
C171112 Front Height Control Sensor RH Circuit Circuit Short to Battery The output voltage of the front height control sensor sub-assembly RH is 4.7 V or higher continuously for 1 second.

  • Front height control sensor sub-assembly RH

  • Wire harness or connector

  • Suspension control ECU

 Comes on Yes
C171212 Front Height Control Sensor LH Circuit Circuit Short to Battery The output voltage of the front height control sensor sub-assembly LH is 4.7 V or higher continuously for 1 second.

  • Front height control sensor sub-assembly LH

  • Wire harness or connector

  • Suspension control ECU

 Comes on Yes
C171312 Rear Height Control Sensor RH Circuit Circuit Short to Battery The output voltage of the rear height control sensor sub-assembly RH is 4.7 V or higher continuously for 1 second.

  • Rear height control sensor sub-assembly RH

  • Wire harness or connector

  • Suspension control ECU

 Comes on Yes
C171412 Rear Height Control Sensor LH Circuit Circuit Short to Battery The output voltage of the rear height control sensor sub-assembly RH is 4.7 V or higher continuously for 1 second.

  • Rear height control sensor sub-assembly LH

  • Wire harness or connector

  • Suspension control ECU

 Comes on Yes

WIRING DIAGRAM

B004YBOE01

CAUTION / NOTICE / HINT

Note


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

  • After replacing the suspension control ECU or height control sensor sub-assembly with a new one, perform vehicle height offset.

    Click here

PROCEDURE


  1. CHECK HEIGHT CONTROL SENSOR SUB-ASSEMBLY INSTALLATION CONDITION


    1. Check the height control sensor sub-assembly installation condition and make sure that there are no loose installation bolts and foreign matter trapped between the sensor and body.

      OK
      Installed correctly.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL HEIGHT CONTROL SENSOR SUB-ASSEMBLY CORRECTLY for Front Side : Click here
    INSTALL HEIGHT CONTROL SENSOR SUB-ASSEMBLY CORRECTLY for Rear Side : Click here

    OK

  2. INSPECT HEIGHT CONTROL SENSOR SUB-ASSEMBLY (FRONT OR REAR)


    1. For Front Side.


      1. Turn the power switch off.

      2. Inspect the front height control sensor sub-assembly RH or front height control sensor sub-assembly LH.

        Click here

    2. For Rear Side.


      1. Turn the power switch off.

      2. Inspect the rear height control sensor sub-assembly RH or rear height control sensor sub-assembly LH.

        Click here

      Result
      Result Proceed to
      OK (for Front Side) A
      OK (for Rear Side) B
      Front height control sensor sub-assembly RH malfunction C
      Front height control sensor sub-assembly LH malfunction D
      Rear height control sensor sub-assembly RH malfunction E
      Rear height control sensor sub-assembly LH malfunction F

    B

    CHECK HARNESS AND CONNECTOR (REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY - SUSPENSION CONTROL ECU) Click here

    C

    REPLACE FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Click here

    D

    REPLACE FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH Click here

    E

    REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Click here

    F

    REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH Click here

    A

  3. CHECK HARNESS AND CONNECTOR (FRONT HEIGHT CONTROL SENSOR SUB-ASSEMBLY - SUSPENSION CONTROL ECU)


    1. Check the front height control sensor sub-assembly RH harness and connector.


      1. Turn the power switch off.

      2. Disconnect the A69*1 or A75*2 front height control sensor sub-assembly RH connector.


        • *1: for AWD

        • *2: for 2WD

      3. Disconnect the L105 suspension control ECU connector.

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

        Standard Resistance
        for AWD
        Tester Connection Condition Specified Condition
        A69-3 (SHB) or L105-25 (SHB1) - A69-2 (SHFR) or L105-13 (SHFR) Always 10 kΩ or higher
        A69-1 (SHG) - L105-12 (SHG1) Always Below 1 Ω
        for 2WD
        Tester Connection Condition Specified Condition
        A75-3 (SHB) or L105-25 (SHB1) - A75-2 (SHFR) or L105-13 (SHFR) Always 10 kΩ or higher
        A75-1 (SHG) - L105-12 (SHG1) Always Below 1 Ω

    2. Check the front height control sensor sub-assembly LH harness and connector.


      1. Turn the power switch off.

      2. Disconnect the A68*1 or A74*2 front height control sensor sub-assembly LH connector.


        • *1: for AWD

        • *2: for 2WD

      3. Disconnect the L105 suspension control ECU connector.

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

        Standard Resistance
        for AWD
        Tester Connection Condition Specified Condition
        A68-3 (SHB) or L105-11(SHB2) - A68-2 (SHFL) or L105-23 (SHFL) Always 10 kΩ or higher
        A68-1 (SHG) - L105-24 (SHG2) Always Below 1 Ω
        for 2WD
        Tester Connection Condition Specified Condition
        A74-3 (SHB) or L105-11 (SHB2) - A74-2 (SHFL) or L105-23 (SHFL) Always 10 kΩ or higher
        A74-1 (SHG) - L105-24 (SHG2) Always Below 1 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY - SUSPENSION CONTROL ECU)


    1. Turn the power switch off.

    2. Disconnect the L104 suspension control ECU connector.

    3. Disconnect the z26 or L179 skid control sensor wire connector.

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

      Standard Resistance
      RH
      Tester Connection Condition Specified Condition
      L104-24 (SHB3) or z26-3 (SHB) - L104-23 (SHRR) or z26-2 (SHRR) Always 10 kΩ or higher
      L104-22(SHG3) - z26-1(SHG) Always Below 1 Ω
      LH
      Tester Connection Condition Specified Condition
      L104-27 (SHB4) or L179-3 (SHB) - L104-26 (SHRL) or L179-2 (SHRL) Always 10 kΩ or higher
      L104-25 (SHG4) - L179-1 (SHG) Always Below 1 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE SUSPENSION CONTROL ECU Click here

    NG

  5. INSPECT SKID CONTROL SENSOR WIRE


    1. Turn the power switch off.

    2. Disconnect the L175 or A skid control sensor wire connector.

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

      B004W1DC10
      *A RH *B LH
      *1 Skid Control Sensor Wire - -
      *a

      Front view of wire harness connector

      (to Rear Height Control Sensor Sub-assembly Side Connector)

      		 *b

      Front view of wire harness connector

      (to Vehicle Side Connector)
      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      L175 -2 (SHB) - z26 -3 (SHB) - L175 -1 (SHRR) - z26 -2 (SHRR) Always 10 kΩ or higher
      L175 -5 (SHG) - z26 -1 (SHG) Always Below 1 Ω
      for LH
      Tester Connection Condition Specified Condition
      A -2 (SHB) - L179 -3 (SHB) - A -1 (SHRL) - L179 -2 (SHRL) Always 10 kΩ or higher
      A -5 (SHG) - L179 -1 (SHG) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    NG

    REPLACE SKID CONTROL SENSOR WIRE Click here