ADAPTIVE VARIABLE SUSPENSION SYSTEM, Diagnostic DTC:C1731, C1732, C1733, C1734

DTC Code DTC Name
C1731 Front Damping Force Control Actuator RH Circuit Malfunction
C1732 Front Damping Force Control Actuator LH Circuit Malfunction
C1733 Rear Damping Force Control Actuator RH Circuit Malfunction
C1734 Rear Damping Force Control Actuator LH Circuit Malfunction

DESCRIPTION

The absorber control actuator changes the damping force depending on absorber control ECU signals.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
C1731 Front Damping Force Control Actuator RH Circuit Malfunction

Either condition is met:


  • An open circuit is detected between the front absorber control actuator RH (front shock absorber assembly RH) and absorber control ECU.

  • A short circuit is detected between the front absorber control actuator RH (front shock absorber assembly RH) and absorber control ECU.

  • Front absorber control actuator RH (front shock absorber assembly RH)

  • Front skid control sensor wire RH

  • Harness or connector

  • Absorber control ECU

 Does not come on
C1732 Front Damping Force Control Actuator LH Circuit Malfunction

Either condition is met:


  • An open circuit is detected between the front absorber control actuator LH (front shock absorber assembly LH) and absorber control ECU.

  • A short circuit is detected between the front absorber control actuator LH (front shock absorber assembly LH) and absorber control ECU.

  • Front absorber control actuator LH (front shock absorber assembly LH)

  • Front skid control sensor wire LH

  • Harness or connector

  • Absorber control ECU

 Does not come on
C1733 Rear Damping Force Control Actuator RH Circuit Malfunction

Either condition is met:


  • An open circuit is detected between the rear absorber control actuator RH (rear shock absorber assembly RH) and absorber control ECU.

  • A short circuit is detected between the rear absorber control actuator RH (rear shock absorber assembly RH) and absorber control ECU.

  • Rear absorber control actuator RH (rear shock absorber assembly RH)

  • for 2WD:

    Rear skid control sensor wire RH

  • for AWD:

    Rear speed sensor RH

  • Harness or connector

  • Absorber control ECU

 Does not come on
C1734 Rear Damping Force Control Actuator LH Circuit Malfunction

Either condition is met:


  • An open circuit is detected between the rear absorber control actuator LH (rear shock absorber assembly LH) and absorber control ECU.

  • A short circuit is detected between the rear absorber control actuator LH (rear shock absorber assembly LH) and absorber control ECU.

  • Rear absorber control actuator LH (rear shock absorber assembly LH)

  • for 2WD:

    Rear skid control sensor wire LH

  • for AWD:

    Rear speed sensor LH

  • Harness or connector

  • Absorber control ECU

 Does not come on

WIRING DIAGRAM

B002KJZE01
B002JDNE03

CAUTION / NOTICE / HINT

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

  • When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met.

    Click here

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Chassis > Air suspension > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. PERFORM ACTIVE TEST USING GTS (DAMPER STEP)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (READY).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / Air suspension /Active Test.


      Chassis > Air suspension > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Damper Step FR Changes damper step (front RH) 1 to 30 step The shock absorber hardens as the damper step increases.
      Damper Step FL Changes damper step (front LH) 1 to 30 step The shock absorber hardens as the damper step increases.
      Damper Step RR Changes damper step (rear RH) 1 to 30 step The shock absorber hardens as the damper step increases.
      Damper Step RL Changes damper step (rear LH) 1 to 30 step The shock absorber hardens as the damper step increases.

      Chassis > Air suspension > Active Test
      Tester Display
      Damper Step FR

      Chassis > Air suspension > Active Test
      Tester Display
      Damper Step FL

      Chassis > Air suspension > Active Test
      Tester Display
      Damper Step RR

      Chassis > Air suspension > Active Test
      Tester Display
      Damper Step RL

    6. When performing the Active Test, read each Tester Display item for the applicable wheel on the Data List and check the operation status of the absorber control actuator for the applicable wheel.


      Chassis > Air suspension > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Damper Step FR Damper step (front RH)

      Min.: 1 step

      Max.: 255 step

      		 1 to 30 step -
      Damper Step FL Damper step (front LH)

      Min.: 1 step

      Max.: 255 step

      		 1 to 30 step -
      Damper Step RR Damper step (rear RH)

      Min.: 1 step

      Max.: 255 step

      		 1 to 30 step -
      Damper Step RL Damper step (rear LH)

      Min.: 1 step

      Max.: 255 step

      		 1 to 30 step -
      FR Solenoid Aim Electric Current Level for Control Target solenoid current value (front wheel RH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on step count -
      FL Solenoid Aim Electric Current Level for Control Target solenoid current value (front wheel LH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on step count -
      RR Solenoid Aim Electric Current Level for Control Target solenoid current value (rear wheel RH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on step count -
      RL Solenoid Aim Electric Current Level for Control Target solenoid current value (rear wheel LH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on step count -
      FR Solenoid Drive Duty Solenoid drive duty value (front wheel RH)

      Min.: 0%

      Max.: 100%

      		 Changes depending on step count -
      FL Solenoid Drive Duty Solenoid drive duty value (front wheel LH)

      Min.: 0%

      Max.: 100%

      		 Changes depending on step count -
      RR Solenoid Drive Duty Solenoid drive duty value (rear wheel RH)

      Min.: 0%

      Max.: 100%

      		 Changes depending on step count -
      RL Solenoid Drive Duty Solenoid drive duty value (rear wheel LH)

      Min.: 0%

      Max.: 100%

      		 Changes depending on step count -
      FR Solenoid Electric Current Solenoid current value (front wheel RH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on step count -
      FL Solenoid Electric Current Solenoid current value (front wheel LH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on step count -
      RR Solenoid Electric Current Solenoid current value (rear wheel RH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on step count -
      RL Solenoid Electric Current Solenoid current value (rear wheel LH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on step count -

      Chassis > Air suspension > Data List
      Tester Display
      Damper Step FR
      Damper Step FL
      Damper Step RR
      Damper Step RL
      FR Solenoid Aim Electric Current Level for Control
      FL Solenoid Aim Electric Current Level for Control
      RR Solenoid Aim Electric Current Level for Control
      RL Solenoid Aim Electric Current Level for Control
      FR Solenoid Drive Duty
      FL Solenoid Drive Duty
      RR Solenoid Drive Duty
      RL Solenoid Drive Duty
      FR Solenoid Electric Current
      FL Solenoid Electric Current
      RR Solenoid Electric Current
      RL Solenoid Electric Current
      OK
      The Data List step numbers, drive duty values and current values change according to the GTS Active Test operation.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 4 Click here

    OK

  3. RECONFIRM DTC


    1. Check that the same DTC is output.

      Click here


      Chassis > Air suspension > Trouble Codes
      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  4. INSPECT SHOCK ABSORBER ASSEMBLY


    1. Turn the power switch off.

    2. Remove the absorber control actuator (shock absorber assembly).

      for Front Side: Click here

      for Rear Side: Click here

    3. Inspect the absorber control actuator (shock absorber assembly).

      for Front Side: Click here

      for Rear Side: Click here

      Result
      Result Proceed to
      OK (for Front Side) A
      OK (for Rear Side) B
      Front absorber control actuator RH (front shock absorber assembly RH) malfunction C
      Front absorber control actuator LH (front shock absorber assembly LH) malfunction D
      Rear absorber control actuator RH (rear shock absorber assembly RH) malfunction E
      Rear absorber control actuator LH (rear shock absorber assembly LH) malfunction F

    B

    INSPECT REAR SKID CONTROL SENSOR WIRE OR REAR SPEED SENSOR Click here

    C

    REPLACE FRONT SHOCK ABSORBER ASSEMBLY RH Click here

    D

    REPLACE FRONT SHOCK ABSORBER ASSEMBLY LH Click here

    E

    REPLACE REAR SHOCK ABSORBER ASSEMBLY RH Click here

    F

    REPLACE REAR SHOCK ABSORBER ASSEMBLY LH Click here

    A

  5. INSPECT FRONT SKID CONTROL SENSOR WIRE


    1. Turn the power switch off.

    2. Disconnect the A64 or A65 front skid control sensor wire connector.

    3. Disconnect the C or D front skid control sensor wire connector.

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

      B002JREC04
      *A for RH *B for LH
      *1 Front Skid Control Sensor Wire - -
      *a

      Front view of wire harness connector

      (to Vehicle Side Connector)

      		 *b

      Front view of wire harness connector

      (to Front Absorber Control Actuator Side Connector)
      Standard Resistance
      for Front RH
      Tester Connection Condition Specified Condition
      A64-2 (FAR+) - C-2 Always Below 1 Ω
      A64-1 (FAR-) - C-1 Always
      A64-2 (FAR+) or C-2 - Body ground and other terminals Always 10 kΩ or higher
      A64-1 (FAR-) or C-1 - Body ground and other terminals Always
      for Front LH:
      Tester Connection Condition Specified Condition
      A65-2 (FAL+) - D-2 Always Below 1 Ω
      A65-1 (FAL-) - D-1 Always
      A65-2 (FAL+) or D-2 - Body ground and other terminals Always 10 kΩ or higher
      A65-1 (FAL-) or D-1- Body ground and other terminals Always
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SKID CONTROL SENSOR WIRE Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (FRONT SHOCK ABSORBER ASSEMBLY - ABSORBER CONTROL ECU)


    1. Turn the power switch off.

    2. Disconnect the Q22 absorber control ECU connector.

    3. Connect the A64 or A65 front skid control sensor wire connector.

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

      Standard Resistance
      for Front RH
      Tester Connection Condition Specified Condition
      Q22-5 (FAR+) - C-2 Always Below 1 Ω
      Q22-6 (FAR-) - C-1
      Q22-5 (FAR+) or C-2 - Body ground Always 10 kΩ or higher
      Q22-6 (FAR-) or C-1 - Body ground
      for Front LH
      Tester Connection Condition Specified Condition
      Q22-2 (FAL+) - D-2 Always Below 1 Ω
      Q22-3 (FAL-) - D-1
      Q22-2 (FAL+) or D-2 - Body ground Always 10 kΩ or higher
      Q22-3 (FAL-) or D-1 - Body ground
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ABSORBER CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. INSPECT REAR SKID CONTROL SENSOR WIRE OR REAR SPEED SENSOR


    1. Turn the power switch off.

    2. for 2WD:


      1. Disconnect the oP1 or pQ1 rear skid control sensor wire connector.

      2. Disconnect the o2 or p2 rear skid control sensor wire connector.

      3. B002KH1C08
        *A for RH
        *B for LH
        *1 Rear Skid Control Sensor Wire
        *a

        Front view of wire harness connector

        (to Vehicle Side Connector)
        *b

        Front view of wire harness connector

        (to Rear Absorber Control Actuator Side Connector)

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

        Standard Resistance
        for Rear RH
        Tester Connection Condition Specified Condition
        oP1-1 - o2-1 (+) Always Below 1 Ω
        oP1-2 - o2-3 (-) Always
        oP1-1 or o2-1 (+) - Body ground and other terminals Always 10 kΩ or higher
        oP1-2 or o2-3 (-) - Body ground and other terminals Always
        for Rear LH
        Tester Connection Condition Specified Condition
        pQ1-1 - p2-1 (+) Always Below 1 Ω
        pQ1-2 - p2-3 (-) Always
        pQ1-1 or p2-1 (+) - Body ground and other terminals Always 10 kΩ or higher
        pQ1-2 or p2-3 (-) - Body ground and other terminals Always

    3. for AWD:


      1. Disconnect the P2 or Q2 rear speed sensor connector.

      2. Disconnect the E or F rear speed sensor connector.

      3. B002KH1C09
        *A for RH
        *B for LH
        *1 Rear Speed Sensor
        *a

        Front view of wire harness connector

        (to Vehicle Side Connector)
        *b

        Front view of wire harness connector

        (to Rear Absorber Control Actuator Side Connector)

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

        Standard Resistance
        for Rear RH
        Tester Connection Condition Specified Condition
        P2-1 (RAR+) - E-1 Always Below 1 Ω
        P2-2 (RAR-) - E-3 Always
        P2-1 (RAR+) or E-1 - Body ground and other terminals Always 10 kΩ or higher
        P2-2 (RAR-) or E-3 - Body ground and other terminals Always
        for Rear LH
        Tester Connection Condition Specified Condition
        Q2-1 (RAL+) - F-1 Always Below 1 Ω
        Q2-2 (RAL-) - F-3 Always
        Q2-1 (RAL+) or F-1- Body ground and other terminals Always 10 kΩ or higher
        Q2-2 (RAL-) or F-3 - Body ground and other terminals Always
      Result
      Proceed to
      OK
      NG (for 2WD)
      NG (for AWD)

    NG (for 2WD)

    REPLACE REAR SKID CONTROL SENSOR WIRE Click here

    NG (for AWD)

    REPLACE REAR SPEED SENSOR Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (REAR SHOCK ABSORBER ASSEMBLY - ABSORBER CONTROL ECU)


    1. Turn the power switch off.

    2. for 2WD:


      1. Disconnect the Q21 absorber control ECU connector.

      2. Connect the oP1 or pQ1 rear skid control sensor wire connector.

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

        Standard Resistance
        for Rear RH
        Tester Connection Condition Specified Condition
        Q21-6 (RAR+) - o2-1 (+) Always Below 1 Ω
        Q21-5 (RAR-) - o2-3 (-)
        Q21-6 (RAR+) or o2-1 (+) - Body ground Always 10 kΩ or higher
        Q21-5 (RAR-) or o2-3 (-) - Body ground
        for Rear LH
        Tester Connection Condition Specified Condition
        Q21-2 (RAL+) - p2-1 (+) Always Below 1 Ω
        Q21-1 (RAL-) - p2-3 (-)
        Q21-2 (RAL+) or p2-1 (+) - Body ground Always 10 kΩ or higher
        Q21-1 (RAL-) or p2-3 (-) - Body ground

    3. for AWD:


      1. Disconnect the Q21 absorber control ECU connector.

      2. Connect the P2 or Q2 rear speed sensor connector.

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

        Standard Resistance
        for Rear RH
        Tester Connection Condition Specified Condition
        Q21-6 (RAR+) - E-1 Always Below 1 Ω
        Q21-5 (RAR-) - E-3
        Q21-6 (RAR+) or E-1 - Body ground Always 10 kΩ or higher
        Q21-5 (RAR-) or E-3 - Body ground
        for Rear LH
        Tester Connection Condition Specified Condition
        Q21-2 (RAL+) - F-1 Always Below 1 Ω
        Q21-1 (RAL-) - F-3
        Q21-2 (RAL+) or F-1 - Body ground Always 10 kΩ or higher
        Q21-1 (RAL-) or F-3 - Body ground
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ABSORBER CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR