ELECTRONIC SHIFT LEVER SYSTEM SYSTEM DESCRIPTION


  1. SYSTEM DESCRIPTION

    The electronic shift lever system electrically controls the parking lock mechanism using an actuator.

    The transmission control ECU assembly locks/unlocks gearshift control based on lock/unlock request signals from the certification ECU (smart key ECU assembly).

    The transmission control ECU receives the theft deterrent status (lock or unlock) from the certification ECU (smart key ECU assembly).

    Based on this signal, and other information received from the power management control ECU, the transmission control ECU controls the shift control actuator and other parts of the system.

    The transmission control ECU assembly detects DTCs when there are any malfunctions in the system, and informs the driver of selected malfunctions by illuminating the P position switch indicator light and master warning light, and indicating an error message on the multi-display.

  2. SYSTEM DIAGRAM

    A003SHOE03
    Input and Output Signals of Each ECU
    Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method
    Main Body ECU Power Management Control ECU Parking brake switch signal CAN
    Main Body ECU Transmission Control ECU Assembly

    • Power switch signal

    • ACC switch signal

    		 CAN
    Transmission Control ECU Assembly Power Management Control ECU

    • Park (P) state signal

    • Transmission control ECU assembly trouble condition signal

    		 CAN, SIL
    Power Management Control ECU Power Management Control ECU

    • Auto park (P) request signal

    • Auto park (P) complete signal

    		 CAN
    Transmission Control ECU Assembly Combination Meter

    • Park (P) state signal

    • Other than park (P) state signal

    • Transmission control ECU assembly trouble condition signal

    		 CAN
    Power Management Control ECU Combination Meter

    • Shift position signal

    • Hybrid vehicle control ECU trouble condition signal

    		 CAN
    Transmission Control ECU Assembly Certification ECU Gear shift control lock state signal LIN

  3. FUNCTION OF EACH COMPONENT

    Part Name Function
    Shift Control Actuator Assembly

    • Composed of the parking lock motor and the rotation angle sensor. The motor is activated by electric current from the transmission control ECU assembly.

    • Motor rotation is reduced by the cycloid reduction mechanism in the shift control actuator assembly and then output.

    • The rotation angle sensor detects the motor rotation angle with the 2 Hall ICs.
    Transmission Control ECU Assembly

    • The transmission control ECU assembly activates the shift control actuator assembly based on signals from the power management control ECU.

    • The transmission control ECU assembly controls the application timing of current to the parking lock motor based on signals from the rotation angle sensor.
    Parking Lock Mechanism The parking lock pawl rotates according to the movement of the parking lock rod when the parking lock motor rotates, and engages with the parking gear on the transaxle side, causing the parking lock mechanism to lock or unlock.
    Power Management Control ECU The power management control ECU sends a P lock or P unlock demand signal to the transmission control ECU assembly based on information from the shift lever and the P position switch (transmission shift main switch).
    P Position Switch Indicator Light The P position switch indicator light comes on/goes off to indicate the P lock/unlock status and blinks to indicate a malfunction in the electronic shift lever system.
    Combination Meter A malfunction in the transmission control ECU assembly is indicated by the illumination of the master warning light on the combination meter.

  4. OPERATION DESCRIPTION


    1. Operation when switching to park (P):

      A003THVE01

      1. When the P position switch (transmission shift main switch) is pushed to activate the parking lock, a signal is sent to the power management control ECU.

      2. The power management control ECU determines whether "P lock" is possible or not based on this signal and other vehicle information.

      3. If the power management control ECU determines that "P lock" is possible, it sends a "P lock" operation demand signal to the transmission control ECU assembly.

      4. After receiving the signal, the transmission control ECU assembly activates the shift control actuator in order to lock the parking lock mechanism.

        A003RMFE01

      5. The transmission control ECU assembly controls motor rotation angle based on signals from the rotation angle sensor in the shift control actuator.

        Tech Tips

        A003UAGE02

        In the cycloid reduction mechanism, the output shaft is linked to the external gear. Together, they rotate only a single tooth when the eccentric adapter, which is linked to the motor, rotates once. Driving force is increased in this way so that the parking lock mechanism can be switched even when high output is required for parking on a hill, etc.

      6. The P position switch indicator light is illuminated.

    2. Operation to switch from park (P) to a shift state other than park (P):

      A003REZE01

      1. When the hybrid system is started (the vehicle is ready to be driven) and the shift lever is moved to R, N, or D with the brake pedal depressed, a signal is sent to the power management control ECU.

      2. This signal is then sent from the power management control ECU to the transmission control ECU assembly as a "P lock release" operation demand signal.

      3. After receiving the signal, the transmission control ECU assembly activates the shift control actuator in order to unlock the parking lock mechanism.

        A003SAEE01

      4. The transmission control ECU assembly controls motor rotation angle based on signals from the rotation angle sensor in the shift control actuator.

      5. The P position switch indicator light is turned off.

  5. SHIFT STATE CHANGE FUNCTION


    1. The electronic shift lever system comprehensively determines vehicle conditions and changes the shift state, as shown in the following chart, by cooperating with the shift control function of the hybrid system (except when the reject function described later is in operation).

    2. Other than indicated in the following chart, when the power switch is turned off with the vehicle stopped, the shift state is automatically changed to park (P) and all power is turned off.

      A003RJQE03

  6. REJECT FUNCTION


    1. In the electronic shift lever system, there may be a situation in which a shift state change cannot be done for safety reasons. When attempting to move the shift lever in such a situation, the system sounds a reject buzzer inside the meter and changes the shift state as shown in the following table.

      Selector operation which causes reject function to operate Shift state after rejection
      The shift lever is moved to any position with park (P) selected and the brake pedal not depressed. Remains in park (P)
      The P position switch (transmission shift main switch) is pushed while driving. Changes to neutral (N)
      The shift lever is moved to R with drive (D) selected, or D with reverse (R) selected while the vehicle is moving at 12 km/h (7 mph) or more. Changes to neutral (N)
      The shift lever is moved to B with a shift state other than drive (D) or park (P) selected. Changes to neutral (N)
      The shift lever is moved to B with park (P) selected and the brake pedal depressed. Remains in park (P)

  7. P POSITION SWITCH INDICATOR LIGHT CONTROL


    1. The indicator light comes on when park (P) is selected, goes off when another shift state is selected and blinks when a system malfunction occurs.

      Indicator Light
      DTC No. Indicator Light Suspected Cause
      C2300 Blinks

      Shift count malfunction


      • Initial drive mode

      • Park lock/unlock position detection mode

      • Feedback drive mode

      • Range of movement
      C2301 Blinks Shift changing time malfunction
      C2303

      Normal

      (Comes on when park (P) is selected and goes off when another shift state is selected)

      		 P CON MTR relay (transaxle parking lock control relay) lockup
      C2304 Blinks Open or short in shift control actuator assembly [parking lock motor (MUA)] signal circuit
      C2305 Blinks Open or short in shift control actuator assembly [parking lock motor (MVA)] signal circuit
      C2306 Blinks Open or short in shift control actuator assembly [parking lock motor (MWA)] signal circuit
      C2307 Blinks Power source circuit malfunction
      C2308

      Normal

      (Comes on when park (P) is selected and goes off when another shift state is selected)

      		 Transmission control ECU assembly internal error
      C2309 Blinks Open in +B signal circuit
      C2310

      Normal

      (Comes on when park (P) is selected and goes off when another shift state is selected)

      		 Open or short in BATT signal circuit
      C2311 Blinks

      • PCON DUTY malfunction

      • Open or short in PCON signal circuit
      C2315

      Normal

      (Comes on when park (P) is selected and goes off when another shift state is selected)

      • Open or short in PCOS signal circuit

      • P position switch circuit malfunction
      U0146

      Normal

      (Comes on when park (P) is selected and goes off when another shift state is selected)

      		 CAN communication system malfunction

      Note

      Even if the system has returned to normal, the indicator light does not return to normal without the shift lever being moved from the home position to select a state other than park (P). (Normal refers to the indicator light coming on when park (P) is selected and going off when another shift state is selected.)