SHIFT BY WIRE SYSTEM

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Outline

•  A shift-by-wire system has been adopted which performs shift position switching using electrical signals and an actuator instead of shift cables.
•  With the adoption of the shift-by-wire system, functions (Auto P function, shift position restrictions) have been achieved that allow the vehicle to partially control the shift position according to the vehicle conditions and the operations of the driver.

Construction


Structural View

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•  The shift-by-wire system consists of the following.

Part name

Function

Reference
Parking lock actuator (EPL)
The parking lock actuator performs shift position switching by driving the manual shaft using the built-in motor and gears.
(See PARKING LOCK ACTUATOR.)
Selector lever (ECL)
The shift position sensor in the selector lever detects the driver’s selector lever operation and sends it to the PCM via CAN communication.
(See SELECTOR LEVER.)
PCM
Receives information from each module and determines the shift position change.
Sends a shift position change request signal to the selector lever and the parking lock actuator via CAN communication.
(See PCM [SKYACTIV-G 2.0].)
TCM
Detects the shift position and sends the shift position indication request signal to the selector lever and the instrument cluster via CAN communication.
(See TCM [ET6A-EL, ET6AX-EL].)
BCM
Relays CAN communication between each module for the shift-by-wire system.
(See BODY CONTROL MODULE (BCM).)
Indicator
Indicates the actual shift position for the driver.
(See INDICATOR.)
Shift position indication
Indicates the actual shift position for the driver.
(See WARNING/INDICATION/ALARM.)
Shift system warning indication/warning light (red/amber)
Warns the driver of a malfunction in the shift-by-wire system.
Shift position warning beep
Notifies the driver by a warning beep if the selector lever position is different than the actual shift position.
Selector lever not P reminder warning beep
Notifies the driver that the selector lever is not in the P position by a warning beep to prevent the driver from leaving the vehicle with the selector lever in a position other than the P position.


System Wiring Diagram

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Block Diagram

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Function

•  The shift position sensor in the selector lever detects the driver’s selector lever operation and sends the shift position information to the PCM via CAN communication. When the PCM receives the signal, it determines the shift position change.
•  The parking lock actuator switches the shift position based on the shift position switching request signal sent by the PCM.
•  The shift-by-wire system has the following functions to enhance safety.

Function

Outline

Reference
Auto P function
If the vehicle detects an operation by the driver intending to leave the vehicle with the shift position in a position other than P, the vehicle switches the shift position to P automatically.
(See AutoP FUNCTION.)
Shift position restrictions
If a specific operation by the driver is detected while accelerating from a standstill or driving, the vehicle restricts the shift position switching for safety.
(See SHIFT POSITION RESTRICTIONS.)


Operation


Control outline

•  The selector lever detects the driver’s selector lever operation and sends a signal to the PCM as shift position information. The PCM calculates the control content based on the signals from input parts of many different sensors and switches, and sends operation request signals to the parking lock actuator and each type of indication/warning light.
•  The PCM performs operation determination for the Auto P function and shift position restrictions according to the driving scenario.


Shift position switching

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•  When the driver operates the selector lever, the selector lever sends (1) shift position information to the PCM via CAN communication.
•  When the PCM receives the selector lever operation position signal, it determines (2) the availability of shift switching and sends (3) a shift position switching command signal to the parking lock actuator via CAN communication.
•  When the parking lock actuator receives the shift position switching command signal, it drives (4) the built-in motor. As a result, the shift position is switched (5).


Auto P Function

•  For the Auto P function operation, refer to the Auto P function item. (See AutoP FUNCTION.)


Shift position restrictions

•  For the shift position restrictions operation, refer to the shift position restrictions item. (See SHIFT POSITION RESTRICTIONS.)


Warning/indication/alarm function

•  For the type of warning/indication/alarm function operation, refer to the warning/indication/alarm item. (See WARNING/INDICATION/ALARM.)