AIR SUSPENSION SYSTEM FAIL-SAFE CHART


  1. FAIL-SAFE FUNCTION


    1. When an air suspension system malfunction is detected under normal control operation, the suspension control ECU suspends switch control of the height control operation.

      Air Suspension System
      DTC Code Malfunction Item Fail-safe Operation

      C1713

      C1714

      		 Rear height control sensor circuit malfunction

      • If there is an error on only 1 side, the system continues vehicle height control.

      • If errors occur on both sides, the system interrupts vehicle height control.

      C1715

      C1716

      C1717

      		 Acceleration sensor circuit malfunction Interrupts damping force control after fixing the front to the 13th step and the rear to the 15th step.

      C1731

      C1732

      C1733

      C1734

      		 Absorber control actuator circuit malfunction Interrupts damping force control after fixing the front to the 13th step and the rear to the 15th step (except malfunctioning actuator).
      C1745 Exhaust solenoid valve circuit malfunction

      • Auto mode:

        The system sets the target vehicle height to normal, performs vehicle height ascent control and interrupts control.

      • Manual mode:

        The system accepts a switch operation for ascent, provided that the vehicle height is below normal.

      • Continues damping force control.
      C1746 Gate solenoid valve circuit malfunction

      • Interrupts vehicle height control.

      • Continues damping force control.
      C1747 Leveling solenoid valve circuit malfunction

      • Interrupts vehicle height control.

      • Continues damping force control.
      C1751 Compressor relay coil malfunction

      • Auto mode:

        The system sets the target vehicle height to normal, performs vehicle height descent control and interrupts control.

      • Manual mode:

        The system accepts a switch operation for descent, provided that the vehicle height is above normal.

      • Continues damping force control.
      C1752 Height control compressor motor circuit malfunction

      • Auto mode:

        The system sets the target vehicle height to normal, performs vehicle height descent control and interrupts control.

      • Manual mode:

        The system accepts a switch operation for descent, provided that the vehicle height is above normal.

      • Continues damping force control.
      C1761 Continuous electric current to height control compressor motor

      • Auto mode:

        Powered continuously the first time: When the target vehicle height is set to normal or HI, and the vehicle height is more than the target, the system performs vehicle height descent control and interrupts control.

        Powered continuously the second time: The system sets the target vehicle height to normal, effects vehicle height descent control and interrupts control.

      • Manual mode:

        When the compressor motor is powered continuously both the first and second times, the system accepts a switch operation for descent, provided that the vehicle height is above normal.

      • Continues damping force control.
      C1762 Continuous electric current to exhaust solenoid

      • Auto mode:

        The system sets the target vehicle height to normal, performs vehicle height ascent control and interrupts control.

      • Manual mode:

        The system accepts a switch operation for ascent, provided that the vehicle height is below normal.

      • Continues damping force control.
      C1781 Suspension control ECU Malfunction Interrupts vehicle height control and damping force control.
      C1782 Power source voltage malfunction

      • The system interrupts vehicle height control only when there is an error in the +B power source.

      • Interrupts the damping force control.
      C1783 Speed sensor signal malfunction

      • Continues vehicle height control.

      • When the front right side is malfunctioning, fixes the front to the 13th step and the rear to the 15th step.
      C1784 Steering angle sensor signal malfunction

      • Continues vehicle height control.

      • Interrupts damping force control after fixing the front to the 13th step and the rear to the 15th step.
      C1787 Forward/rearward/sideways acceleration sensor signal malfunction

      • Continues height control.

      • Interrupts the damping force of rolling control.
      C1789 Vehicle identification malfunction

      • Continues height control.

      • Interrupts damping force control after fixing the front to the 13th step and the rear to the 15th step.
      U0100 Lost communication with ECM Continues vehicle height control and damping force control.
      U0114 Lost communication with four wheel drive control ECU Continues vehicle height control and damping force control.
      U0122 Lost communication with skid control ECU

      • The target vehicle height is set to normal height.

      • Interrupts damping force control after fixing the front to the 13th step and the rear to the 15th step.
      U0124 Lost communication with yaw rate and acceleration sensor

      • Continues vehicle height control.

      • Interrupts damping force control after fixing the front to the 13th step and the rear to the 15th step.
      U0126 Lost communication with steering angle sensor

      • Continues vehicle height control.

      • Interrupts damping force control after fixing the front to the 13th step and the rear to the 15th step.
      U0140 Lost communication with main body ECU Continues vehicle height control and damping force control.