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ELECTRONIC SHIFT LEVER SYSTEM > SYSTEM DESCRIPTION

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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 (does not apply to all models).

SYSTEM DIAGRAM

C210353E01


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
  1. Power switch signal
  2. ACC switch signal
CAN
Transmission Control ECU Assembly
Power Management Control ECU
  1. Park (P) state signal
  2. Transmission control ECU assembly trouble condition signal
CAN, SIL
Power Management Control ECU
Power Management Control ECU
  1. Auto park (P) request signal
  2. Auto park (P) complete signal
CAN
Transmission Control ECU Assembly
Combination Meter
  1. Park (P) state signal
  2. Other than park (P) state signal
  3. Transmission control ECU assembly trouble condition signal
CAN
Power Management Control ECU
Combination Meter
  1. Shift position signal
  2. Hybrid vehicle control ECU trouble condition signal
CAN
Transmission Control ECU Assembly
Certification ECU
Gear shift control lock state signal
LIN

FUNCTION OF EACH COMPONENT

Part Name
Function
Shift Control Actuator
  1. Composed of the parking lock motor and the rotation angle sensor. The motor is activated by electric current from the transmission control ECU assembly.
  2. Motor rotation is reduced by the cycloid reduction mechanism in the shift control actuator and then output.
  3. The rotation angle sensor detects the motor rotation angle with the 2 Hall ICs.
Transmission control ECU assembly
  1. The transmission control ECU assembly activates the shift control actuator based on signals from the power management control ECU.
  2. 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 or goes off to indicate the P lock/unlock status. The P position switch indicator light flashes or goes off when the electronic shift lever system malfunctions and an error message is displayed on the multi display.
Combination Meter
A malfunction in the transmission control ECU assembly is indicated by the illumination of the master warning light on the combination meter.

OPERATION DESCRIPTION


  1. Operation to switch to the P position:


    C210354E01


    1. When the park (P) is selected to activate 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.


      C210355E01

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

      HINT:
      C126761E02
      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. Turn on the P position switch indicator light.



  2. Operation to switch to a non-P position:


    C210356E02


    1. When the hybrid system is started (the vehicle is ready to be driven) and the selector 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.


      C210357E01

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

    5. Turn off the P position switch indicator light.


SHIFT POSITION CHANGE FUNCTION

  1. The electronic shift lever system comprehensively determines vehicle conditions and changes the shift position, 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.


    C215195E03


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 11 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)


P POSITION SWITCH INDICATOR LIGHT CONTROL

  1. The indicator light comes on when park (P) is selected, goes off when a shift state other than park (P) is selected and goes off when a system malfunction occurs and an error message is displayed on the multi display.

    Indicator Light 
    DTC No.
    		Indicator Light
    		Suspected Cause
    C2300
    		Goes off
    (An error message is displayed on the multi display.)
    		Shift count malfunction
    1. Initial drive mode
    2. Park lock/unlock position detection mode
    3. Feedback drive mode
    4. Range of movement
    C2301
    		Goes off
    (An error message is displayed on the multi display.)
    		Shift changing time malfunction
    C2303
    		Normal
    (Comes on when the P position is engaged and goes off when it is disengaged)
    		P CON MTR relay (transaxle parking lock control relay) lockup
    C2304
    		Goes off
    (An error message is displayed on the multi display.)
    		Open or short in shift control actuator assembly [parking lock motor (MUA)] signal circuit
    C2305
    		Goes off
    (An error message is displayed on the multi display.)
    		Open or short in shift control actuator assembly [parking lock motor (MVA)] signal circuit
    C2306
    		Goes off
    (An error message is displayed on the multi display.)
    		Open or short in shift control actuator assembly [parking lock motor (MWA)] signal circuit
    C2307
    		Goes off
    (An error message is displayed on the multi display.)
    		Power source circuit malfunction
    C2308
    		Normal
    (Comes on when the P position is engaged, and goes off when it is disengaged)
    		Transmission control ECU assembly internal error
    C2309
    		Goes off
    (An error message is displayed on the multi display.)
    		Open in +B signal circuit
    C2310
    		Normal
    (Comes on when the P position is engaged, and goes off when it is disengaged)
    		Open or short in BATT signal circuit
    C2311
    		Goes off
    (An error message is displayed on the multi display.)
    1. PCON DUTY malfunction
    2. Open or short in PCON signal circuit
    C2315
    		Normal
    (Comes on when the P position is engaged, and goes off when it is disengaged)
    1. Open or short in PPOS signal circuit
    2. Transmission shift main switch (P position switch) circuit malfunction
    U0146
    		Normal
    (Comes on when the P position is engaged, and goes off when it is disengaged)
    		CAN communication system malfunction

    NOTICE:
    Even if the system has returned to normal, with park (P) selected, the indicator light does not return to normal without selecting a shift 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.)