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 assembly 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 assembly controls the shift control actuator assembly 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 master warning light, and indicating an error message on the multi-information display.

HINT: 

Depending on the DTC that is stored, the master warning light may not illuminate and an error message may not be displayed on the multi-information display.

1. Operation when switching to park (P):
   Fig 2: Identifying Operation System Diagram

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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 assembly in order to lock the parking lock mechanism.
      Fig 3: Identifying Operation System Diagram

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   5. The transmission control ECU assembly controls motor rotation angle based on signals from the rotation angle sensor in the shift control actuator assembly.

      HINT: 

      Fig 4: Identifying Cycloid Reduction Mechanism

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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):
   Fig 5: Identifying Shift Lever Operation Diagram

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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 assembly in order to unlock the parking lock mechanism.
      Fig 6: Identifying Shift Lever Operation Diagram

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. The transmission control ECU assembly controls motor rotation angle based on signals from the rotation angle sensor in the shift control actuator assembly.
   5. The P position switch indicator light is turned off.

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.
   Fig 7: Identifying Shift State Change Function Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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)
   With park (P) selected, the shift lever is moved to any position during plug-in charging (while the plug-in cable is connected).	Remains in park (P)

1. The P position switch 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-information display.
   P POSITION SWITCH INDICATOR LIGHT
   
   

   DTC No.	P Position Switch Indicator Light	Suspected Cause
   C2300	Goes off (An error message is displayed on the multi-information display.)	Shift count malfunction Initial drive mode Park lock/unlock position detection mode Feedback drive mode Range of movement Continual abnormal current
   C2301	Goes off (An error message is displayed on the multi-information display.)	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	Goes off (An error message is displayed on the multi-information 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-information 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-information 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-information display.)	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	Goes off (An error message is displayed on the multi-information display.)	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	Goes off (An error message is displayed on the multi-information display.)	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 PPOS 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, with park (P) selected, the P position switch indicator light does not return to normal without selecting a shift state other than park (P). (Normal refers to the P position switch indicator light coming on when park (P) is selected and going off when another shift state is selected.)

   HINT: 

   • When the system is normal and plug-in battery charging is performed, the P position switch indicator light will go off when the power switch is turned off and come on when the power switch is turned on (IG).
   • When there is a malfunction in the system, the malfunction will be detected after the vehicle is plugged-in and shown by the operation of the P position switch indicator light as described in the table above.