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 pneumatic cylinder assembly with shock absorber changes the damping force depending on absorber control ECU signals.

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

Either condition is met:


  • An open circuit is detected between the front pneumatic cylinder assembly RH with shock absorber 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 pneumatic cylinder assembly RH with shock absorber

  • Absorber control wire RH

  • Wire harness or connector

  • Absorber control ECU

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

Either condition is met:


  • An open circuit is detected between the front pneumatic cylinder assembly LH with shock absorber 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 pneumatic cylinder assembly LH with shock absorber

  • Absorber control wire LH

  • Wire harness or connector

  • Absorber control ECU

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

Either condition is met:


  • An open circuit is detected between the rear pneumatic cylinder assembly RH with shock absorber 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 pneumatic cylinder assembly RH with shock absorber

  • Skid control sensor wire RH

  • Wire harness or connector

  • Absorber control ECU

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

Either condition is met:


  • An open circuit is detected between the rear pneumatic cylinder assembly LH with shock absorber 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 pneumatic cylinder assembly LH with shock absorber

  • Skid control sensor wire LH

  • Wire harness or connector

  • Absorber control ECU

 Does not come on Yes

WIRING DIAGRAM

B006CLNE01

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:


    • Symptom simulation.

      Click here

    • DTC inspection.

      Click here

    • GTS inspection.

      Click here


      • If no malfunctions are found in other areas, replace the absorber control ECU.

  • After replacing the absorber control ECU with a new one, perform registration of vehicle identification information.

    Click here

PROCEDURE


  1. CLEAR DTCS


    1. Clear the DTCs.

      Click here


      Chassis > Adaptive Variable Suspension System > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. PERFORM ACTIVE TEST USING GTS (FOUR-WHEEL DAMPING FORCE FULL HARD/SOFT)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / Adaptive Variable Suspension System /Active Test.


      Chassis > Adaptive Variable Suspension System > Active Test
      Tester Display Measurement Item Restrict Condition
      Four-Wheel Damping Force Full Hard Four-Wheel Damping Force Full Hard

      • Vehicle stopped

      • Engine idling

      • When the actuator system is normal

      • When the power source voltage system is normal
      Four-Wheel Damping Force Full Soft Four-Wheel Damping Force Full Soft

      • Vehicle stopped

      • Engine idling

      • When the actuator system is normal

      • When the power source voltage system is normal

    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 pneumatic cylinder assembly with shock absorber for the applicable wheel.


      Chassis > Adaptive Variable Suspension System > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Solenoid Aim Electric Current Level for Control Target solenoid current value (front wheel RH)

      Min.: 0 mA

      Max.: 2040 mA

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

      Min.: 0 mA

      Max.: 2040 mA

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

      Min.: 0 mA

      Max.: 2040 mA

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

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on target damping force -
      FR Solenoid Drive Duty Solenoid drive duty value (front wheel RH)

      Min.: 0%

      Max.: 100%

      		 Changes depending on target damping force -
      FL Solenoid Drive Duty Solenoid drive duty value (front wheel LH)

      Min.: 0%

      Max.: 100%

      		 Changes depending on target damping force -
      RR Solenoid Drive Duty Solenoid drive duty value (rear wheel RH)

      Min.: 0%

      Max.: 100%

      		 Changes depending on target damping force -
      RL Solenoid Drive Duty Solenoid drive duty value (rear wheel LH)

      Min.: 0%

      Max.: 100%

      		 Changes depending on target damping force -
      FR Solenoid Electric Current Solenoid current value (front wheel RH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on target damping force -
      FL Solenoid Electric Current Solenoid current value (front wheel LH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on target damping force -
      RR Solenoid Electric Current Solenoid current value (rear wheel RH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on target damping force -
      RL Solenoid Electric Current Solenoid current value (rear wheel LH)

      Min.: 0 mA

      Max.: 2040 mA

      		 Changes depending on target damping force -

      Chassis > Adaptive Variable Suspension System > Active Test
      Active Test Display
      Four-Wheel Damping Force Full Hard
      Data List Display
      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

      Chassis > Adaptive Variable Suspension System > Active Test
      Active Test Display
      Four-Wheel Damping Force Full Soft
      Data List Display
      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 operation of the Active Test.
      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 > Adaptive Variable Suspension System > 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 PNEUMATIC CYLINDER ASSEMBLY WITH SHOCK ABSORBER


    1. Turn the engine switch off.

    2. Inspect the pneumatic cylinder assembly with shock absorber.

      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 pneumatic cylinder assembly RH with shock absorber malfunction C
      Front pneumatic cylinder assembly LH with shock absorber malfunction D
      Rear pneumatic cylinder assembly RH with shock absorber malfunction E
      Rear pneumatic cylinder assembly LH with shock absorber malfunction F

    B

    CHECK HARNESS AND CONNECTOR (REAR PNEUMATIC CYLINDER ASSEMBLY WITH SHOCK ABSORBER - ABSORBER CONTROL) Click here

    C

    REPLACE FRONT PNEUMATIC CYLINDER ASSEMBLY RH WITH SHOCK ABSORBER Click here

    D

    REPLACE FRONT PNEUMATIC CYLINDER ASSEMBLY LH WITH SHOCK ABSORBER Click here

    E

    REPLACE REAR PNEUMATIC CYLINDER ASSEMBLY RH WITH SHOCK ABSORBER Click here

    F

    REPLACE REAR PNEUMATIC CYLINDER ASSEMBLY LH WITH SHOCK ABSORBER Click here

    A

  5. CHECK HARNESS AND CONNECTOR (FRONT PNEUMATIC CYLINDER ASSEMBLY WITH SHOCK ABSORBER - ABSORBER CONTROL ECU)


    1. Turn the engine switch off.

    2. Disconnect the L46 absorber control ECU connector.

    3. Disconnect the A23 or A14 absorber control 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
      L46-5 (FAR+) - A23-2 (FAR+) Always Below 1 Ω
      L46-6 (FAR-) - A23-1 (FAR-)
      L46-5 (FAR+) or A23-2 (FAR+) - Body ground Always 10 kΩ or higher
      L46-6 (FAR-) or A23-1 (FAR-) - Body ground
      for Front LH
      Tester Connection Condition Specified Condition
      L46-2 (FAL+) - A14-2 (FAL+) Always Below 1 Ω
      L46-3 (FAL-) - A14-1 (FAL-)
      L46-2 (FAL+) or A14-2 (FAL+) - Body ground Always 10 kΩ or higher
      L46-3 (FAL-) or A14-1 (FAL-) - Body ground
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ABSORBER CONTROL ECU Click here

    NG

  6. INSPECT ABSORBER CONTROL WIRE


    1. Turn the engine switch off.

    2. Disconnect the B or C absorber control wire connector.

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

      B006AR5C04
      *A RH *B LH
      *1 Absorber Control Wire - -
      *a

      Front view of wire harness connector

      (to Front Absorber Control Actuator Side Connector)

      		 *b

      Front view of wire harness connector

      (to Vehicle Side Connector)
      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      B -1 - A23 -1 (FAR-) Always Below 1 Ω
      B -2 - A23 -2 (FAR+)
      B -1 or A23 -1 (FAR-) - Body ground and other terminals Always 10 kΩ or higher
      B -2 or A23 -2 (FAR+) - Body ground and other terminals
      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition
      C -1 - A14 -1 (FAL-) Always Below 1 Ω
      C -2 - A14 -2 (FAL+)
      C -1 or A14 -1 (FAL-) - Body ground and other terminals Always 10 kΩ or higher
      C -2 or A14 -2 (FAL+) - Body ground and other terminals
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE ABSORBER CONTROL WIRE Click here

  7. CHECK HARNESS AND CONNECTOR (REAR PNEUMATIC CYLINDER ASSEMBLY WITH SHOCK ABSORBER - ABSORBER CONTROL)


    1. Turn the engine switch off.

    2. Disconnect the L30 absorber control ECU connector.

    3. Disconnect the z25 or L75 skid control sensor wire connector.

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

      Standard Resistance
      for Rear RH
      Tester Connection Condition Specified Condition
      L30-6 (RAR+) - z25-1 (RAR+) Always Below 1 Ω
      L30-5 (RAR-) - z25-3 (RAR-)
      L30-6 (RAR+) or z25-1 (RAR+) - Body ground Always 10 kΩ or higher
      L30-5 (RAR-) or z25-3 (RAR-) - Body ground
      for Rear LH
      Tester Connection Condition Specified Condition
      L30-2 (RAL+) - L75-1 (RAL+) Always Below 1 Ω
      L30-1 (RAL-) - L75-3 (RAL-)
      L30-2 (RAL+) or L75-1 (RAL+) - Body ground Always 10 kΩ or higher
      L30-1 (RAL-) or L75-3 (RAL-) - Body ground
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ABSORBER CONTROL ECU Click here

    NG

  8. INSPECT SKID CONTROL SENSOR WIRE


    1. Turn the engine switch off.

    2. Disconnect the L45 or D skid control sensor wire connector.

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

      B006AQCC05
      *A RH *B LH
      *1 Skid Control Sensor Wire - -
      *a

      Front view of wire harness connector

      (to Rear Absorber Control Actuator Side Connector)

      		 *b

      Front view of wire harness connector

      (to Vehicle Side Connector)
      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      L45 -1 (RAR+) - z25 -1 (RAR+) Always Below 1 Ω
      L45 -2 (RAR-) - z25 -3 (RAR-)
      L45 -1 (RAR+) or z25 -1 (RAR+) - Body ground and other terminals Always 10 kΩ or higher
      L45 -2 (RAR-) or z25 -3 (RAR-) - Body ground and other terminals
      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition
      D -1 - L75 -1 (RAL+) Always Below 1 Ω
      D -2 - L75 -3 (RAL-)
      D -1 or L75 -1 (RAL+) - Body ground and other terminals Always 10 kΩ or higher
      D -2 or L75 -3 (RAL-) - Body ground and other terminals
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE SKID CONTROL SENSOR WIRE Click here