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Home >> Toyota >> 2021 >> Mirai XLE >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Electronic A/T Shift Lever System - Diagnostics - Introduction >> Electronic Shift Lever System >> System Description [12/2023 - ] >> System Description [12/2023 - ]
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System Description [12/2023 - ]

  1. SYSTEM DESCRIPTION 

    The electronic shift lever system electrically controls the transmission parking lock mechanism and shift control mechanism.

    The shift control ECU judges the vehicle condition based on the information from each sensor, switch and ECU and performs appropriate shift control based on the driver's operation of the shift lever or P position switch.

    If a malfunction occurs in the electronic shift lever system, the master warning illuminates in the combination meter assembly (according to the malfunction mode, the shift position indicator (P, R, N, D, Br) turns off (not in all cases)) and a warning message is also displayed on the multi-information display.

    When the shift control ECU detects a malfunction, the DTC is stored in the EV control ECU.

  2. REJECT FUNCTION 
    1. A reject function is equipped to reject incorrect shift switching when the shift lever is operated incorrectly.
    2. When the reject function operates, the current shift state is maintained or switches to the neutral (N). Also, the recommended handling method is displayed on the multi-information display.
      REJECT FUNCTION OPERATION CHART

      Shift Operation Performed by Reject Function Shift State After Reject Function Operation Message Displayed on Multi-information Display
      Changes the shift state when the auxiliary battery voltage was low Maintains current shift state Battery low
      Shifting unavailable
      See owner's Service Information
      Changes the shift state to and from park (P) within a short period of time Maintains current shift state Shifting unavailable
      Wait a moment and
      Shift again
      Changes the shift state from park (P) or neutral (N) to brake (Br) Maintains current shift state Vehicle must be in D
      to shift into Br
      • Changes the shift state to drive (D), reverse (R) or brake (Br) when the ignition switch is ON and ON (READY) indicator is off
      • Changes the shift state from park (P) when the READY indicator is blinking
      • Changes the shift state from park (P) when the required voltage to change the shift state is not available
      Maintains current shift state EV system must be READY to shift
      • Changes the shift state from park (P) with the brake pedal not depressed
      • When the vehicle is stopped, the driver attempted to change the shift position without depressing the brake pedal, after the power of the shift control ECU was temporarily cut off
      Maintains current shift state Press brake to shift
      Changes the shift state directly to brake (Br) from reverse (R) Neutral (N) Shifted into N
      Vehicle must be in D
      to shift into Br
      Changes the shift state to drive (D) while backing up Neutral (N) Shifted into N
      Vehicle must be stopped
      to shift into D
      Changes the shift state to reverse (R) while driving forward Neutral (N) Shifted into N
      Vehicle must be stopped
      to shift into R
      P position switch was pressed short when driving Maintains current shift state -
      P position switch was pressed repeatedly or held pressed when driving Neutral (N) Shifted into N
      Vehicle must be stopped to
      shift into P
      • Changes the shift state form park (P) when accelerator and brake pedals depressed simultaneously
      • Changes the shift state from neutral (N) to drive (D) or reverse (R) with accelerator pedal depressed
      Maintains current shift state Release accelerator to shift
      Changes the shift state to neutral (N) when the system detects the shift lever was moved to N but not enough time elapsed for manual switching Maintains current shift state* Temporarily hold shift lever
      in N position
      to shift into N
      Changing the shift state from P when there is an external connection (during hydrogen refueling) Park (P) -

      *: The shift state may shift to neutral (N) depending on the driving conditions.

  3. N RANGE HOLD MODE OPERATION 
    1. The ignition switch can be turned off while holding the shift state in neutral (N) by performing the following operation.
      1. Switch the shift lever to neutral (N).
      2. Return the shift lever to the neutral position.
      3. Move the shift lever to neutral (N) again (the buzzer sounds).
      4. Turn the ignition switch off with the shift state held in the neutral (N) or within 5 seconds after releasing the shift lever (the buzzer will sound and a confirmation message will be displayed on the multi-information display).

        HINT: 

        • Pressing the P switch will switch the shift state to park (P) and exit from N range hold mode.
        • Do not turn the ignition switch to ON or off unnecessarily while in N range hold mode except in an emergency.
  4. AUTOMATIC PARK (P) CHANGING FUNCTION WHEN EXITING 

    If it is detected that the driver has exited the vehicle* while the shift state is not park (P), the shift state will be changed to park (P) automatically.

    *: The driver seat belt buckle is off, the driver seat door is open, and the brake pedal is released.

    HINT: 

    This function (auto-shifting function) operates if the driver exits the vehicle while the shift state is not park (P). It does not function at all times.