ELECTRONIC SHIFT LEVER SYSTEM

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 EV 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.

Tech Tips

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.

SYSTEM DIAGRAM

Input and Output Signals of Each ECU
Transmitting ECU (Transmitter)	Receiving ECU	Signal	Communication Method
Main Body ECU	Combination Meter Assembly	Parking brake switch signal	CAN
Main Body ECU	Transmission Control ECU Assembly	Power switch signal ACC switch signal	CAN
Transmission Control ECU Assembly	Certification ECU (Smart Key ECU Assembly)	Park (P) state signal Transmission control ECU assembly trouble condition signal	CAN
Certification ECU (Smart Key ECU Assembly)	EV Control ECU	Auto park (P) request signal	CAN
EV Control ECU	Certification ECU (Smart Key ECU Assembly)	Auto park (P) complete signal	CAN
Transmission Control ECU Assembly	Combination Meter Assembly	Park (P) state signal Other than park (P) state signal Transmission control ECU assembly trouble condition signal	CAN
EV Control ECU	Combination Meter Assembly	Shift position signal EV control ECU trouble condition signal	CAN
Transmission Control ECU Assembly	Certification ECU (Smart Key ECU Assembly)	Gear shift control lock state signal	LIN

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 EV 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.
EV Control ECU	The EV 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 (integration control and panel assembly).
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 goes off when the electronic shift lever system malfunctions and an error message is displayed on the multi-information display.
Combination Meter Assembly	A malfunction in the transmission control ECU assembly is indicated by the illumination of the master warning light on the combination meter.

OPERATION DESCRIPTION

Operation when switching to park (P):
1. When the P position switch (integration control and panel assembly) is pushed to activate the parking lock, a signal is sent to the EV control ECU.
2. The EV control ECU determines whether "P lock" is possible or not based on this signal and other vehicle information.
3. If the EV 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.
5. The transmission control ECU assembly controls motor rotation angle based on signals from the rotation angle sensor in the shift control actuator assembly.
  
  Tech Tips
  
  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.
Operation to switch from park (P) to a shift state other than park (P):
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 EV control ECU.
2. This signal is then sent from the EV 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.
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.

SHIFT STATE CHANGE FUNCTION

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).
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.

REJECT FUNCTION

In the electronic shift lever system, there may be a situation in which a shift state change cannot be performed for safety reasons. In such a situation, when the shift lever is moved to attempt to change the shift state, the system sounds a reject buzzer inside the meter, displays a warning message on the multi-information display and changes the shift state as shown in the following table.

Selector operation which causes reject function to operate	Shift state after rejection	Message displayed on multi-information display
Shift operated when auxiliary battery voltage is low	Stays in P position	Insufficient Aux Battery Charge Shift is Unavailable See Owner's Manual
Shift lever selected to D or R while READY indicator is blinking	Stays in P position	Shifting Unavailable When READY Indicator is Flashing
While consecutive operations are prohibited, shift lever is selected from P to a different position	Stays in P position	Shifting Temporarily Unavailable Wait a Moment and Try Again
Shift lever selected from R position to Br mode	N position	Shifted to [N] Position Shift to [D] once, then Shift to [Br]
Shift lever selected to D or R while ON (IG ON) and READY indicator is not illuminated	Stays in P position	Shifting to [D] or [R] Position Unavailable Try to Shift after FC System has Started
Shift lever selected from P to a different position without depressing the brake pedal	Stays in P position	Shifting Unavailable Press Brake Pedal before Shifting
Shift lever selected from P or N position to Br mode	Stays in same position as before shifting operation (P or N)	Shifting to [Br] Mode Unavailable Shift to [D] once, then Shift to [Br]
Shift lever selected from R position to Bs mode	N position	Shifted to [N] Position Shift to [D] once, then Shift to [Br]
Shift lever selected to R while vehicle is being driven forward*	N position	Shifted to [N] Position Stop Your Vehicle before Shifting to [R]
Shift lever selected to D while vehicle is being driven in reverse*	N position	Shifted to [N] Position Stop Your Vehicle before Shifting to [D]
Shift lever selected to P while vehicle is being driven	N position	Shifted to [N] Position To Shift to [P], Stop Your Vehicle and Press [P] Switch

P POSITION SWITCH INDICATOR LIGHT CONTROL

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-information display.

Indicator Light
DTC No.	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
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 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 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.)