CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM(for 1ZR-FAE) FAIL-SAFE CHART


  1. Description

    The fail-safe function minimizes the loss of Continuously Variable Transaxle (CVT) system functions when a malfunction occurs in a sensor or solenoid valve.

  2. Fail-safe


    1. Fail-safe control list:

      Malfunctioning Part Function
      Transmission revolution sensor (NT) The oil pressure of the primary pulley and secondary pulley are set to a specified value. The opening angle of the throttle valve is limited to reduce input torque.
      Transmission revolution sensor (NOUT)
      Transmission revolution sensor (NIN)
      Shift solenoid valve SL The ECM stops sending current to the shift solenoid valve SL, and forward and reverse clutch control is performed mechanically. Lock-up clutch control is canceled.
      Shift solenoid valve SC The ECM stops sending current to the shift solenoid valve SC, and forward and reverse clutch control is performed mechanically. Lock-up clutch control is canceled.
      Shift solenoid valve SLU The ECM stops sending current to the shift solenoid valve SLU, and forward and reverse clutch control is performed mechanically. Lock-up clutch control is canceled.
      Shift solenoid valve SLP The gear ratio is limited to a specified range.
      Shift solenoid valve SLS

      • The gear ratio is set to a specified value.

      • The lock-up range is limited to a particular range.
      CVT fluid temperature sensor The ECM sets the fluid temperature to a predetermined value to perform normal control.