System Description
Transmits the power from the engine to the drive wheel.
Scheme 1
Component Description
| Item | Function |
|---|---|
| Torque converter | The torque converter is the device that increases the engine torque as well as the conventional AT and transmits it to the transaxle. |
| Oil pump | The adoption of a trochoidal oil pump with a flow control valve actuated directly by the engine enables the sufficient discharge from an oil pump in the low-RPM range and the adequate discharge adjustments in the high-RPM range. |
| Planetary gear | Perform the transmission of drive power and the switching of forward/backward movement. |
| Forward clutch | |
| Reverse brake | |
| Primary pulley | It is composed of a pair of pulleys (the groove width is changed freely in the axial direction) and the steel belt (the steel star wheels are placed continuously and the belt is guided with the multilayer steel rings on both sides). The groove width changes according to wrapping radius of steel belt and pulley from low status to overdrive status continuously with non-step. It is controlled with the oil pressures of primary pulley and secondary pulley. |
| Secondary pulley | |
| Steel belt | |
| Output gear | Reduction gear consists of primary deceleration (output gear and idler gear in pair) and secondary deceleration (reduction gear and final gear in pair). Each of them uses a helical gear. |
| Idler gear | |
| Reduction gear | |
| Final gear | |
| Differential | |
| Manual shaft | The parking rod rotates the parking pole and the parking pole engages with the parking gear when the manual shaft is in "P" position. As a result the parking gear and the output axis are fixed. |
| Parking rod | |
| Parking pawl | |
| Parking gear |
COMPONENT DESCRIPTION CHART
Scheme 2
The hydraulic control mechanism consists of the oil pump directly driven by the engine, the hydraulic control valve that controls line pressure and transmission, and the input signal line.
Scheme 3
- When an input torque signal equivalent to the engine driving force is transmitted from the ECM to the TCM, the TCM controls the line pressure solenoid valve and secondary pressure solenoid valve.
- Line pressure solenoid valve activates pressure regulator valve, and line pressure from oil pump is adjusted for the optimum driving condition. Secondary pressure is controlled by lowering line pressure.
The CVT senses vehicle operating conditions through various sensors. It always controls the optimum shift position and reduces shifting and lock-up shocks.
In order to select the gear ratio that can obtain the driving force in accordance with driver's intention and the vehicle condition, TCM monitors the driving conditions, such as the vehicle speed and the throttle position, selects the optimum gear ratio, and determines the gear change steps to the gear ratio. Then TCM sends the command to the step motor, controls the inflow/outflow of line pressure from the primary pulley to determine the position of the moving-pulley and controls the gear ratio.
The selector lever cannot be shifted from "P" position to any other position unless the ignition switch is in the ON position and the brake pedal is depressed.
Scheme 4
| Component | Function | ||
|---|---|---|---|
| CVT shift selector | Shift lock solenoid | Shift lock solenoid | Operates according to the signal from the shift lock relay. |
| Lock plate | The lock plate restricts the position pin stroke by selector button operation according to the shift lock unit status. | ||
| Position pin | The position pin, linking with the selector button, restricts the selector lever movement. | ||
| Shift lock release | Cancels the shift lock forcibly. | ||
| Stop lamp switch | Provides voltage to the shift lock relay when brake pedal is depressed. | ||
| Shift lock relay | Provides voltage to the shift lock solenoid when ignition switch is ON and brake pedal is depressed. | ||
COMPONENT DESCRIPTION CHART
Description
The MIL is located on the instrument panel.
Scheme 5
- The MIL is turned ON when the ignition switch is turned ON without the engine running. This is a bulb check. If the MIL is not turned ON, refer to " «COMPONENT FUNCTION CHECK»(ref-388048-S23166771872011022800000) ".
- Turn OFF the MIL when the engine is started. If the MIL remains ON, the on board diagnostic system has detected an engine system malfunction.
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent malfunction detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H and CAN-L) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.
- TCM controls starter relay in IPDM E/R.
- TCM switches starter relay ON at "P" or "N" position and allows to crank engine.
- Then it prohibits cranking other than at "P" or "N" position.
BCM detects ON/OFF state of the stop lamp switch and transmits the data to the TCM via CAN communication by converting the data to a signal.
- The Transmission range switch is included in the control valve assembly.
- The Transmission range switch includes 4 transmission position switches.
- TCM judges the selector lever position by the Transmission range switch signal. TRANSMISSION RANGE SWITCH REFERENCE CHART Shift position Transmission range switch 1 Transmission range switch 2 Transmission range switch 3 Transmission range switch 4 Transmission range switch 3 (monitor) P OFF OFF OFF OFF OFF R ON OFF OFF ON OFF N ON ON OFF OFF OFF D ON ON ON ON ON
The CVT fluid temperature sensor detects the CVT fluid temperature and sends a signal to the TCM.
The primary speed sensor detects the primary pulley revolution speed and sends a signal to the TCM.
The secondary speed sensor detects the revolution of the CVT output shaft and emits a pulse signal. The pulse signal is transmitted to the TCM, which converts it into vehicle speed.
The engine speed signal is transmitted from ECM to TCM via CAN communication line.
TCM selects the gear ratio using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolution speed as input signals. Then it changes the operating pressure of the primary pulley and the secondary pulley and changes the groove width of the pulley.
- The torque converter clutch solenoid valve is activated by the TCM in response to signals sent from the vehicle speed and accelerator pedal position sensors. Lock-up piston operation will then be controlled.
- Lock-up operation, however, is prohibited when CVT fluid temperature is too low.
- When the accelerator pedal is depressed (less than 2.0/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.
This malfunction is detected when the torque converter clutch does not lock-up as instructed by the TCM. This is not only caused by electrical malfunctions (circuits open or shorted), but also by mechanical malfunctions such as control valve sticking, improper solenoid valve operation, etc.
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.
The secondary pressure solenoid valve regulates the secondary pressure to suit the driving condition in response to a signal sent from the TCM.
The secondary pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.
Manual mode switch is installed in CVT shift selector.
Manual mode switch transmits signals (manual mode, not manual mode, shift up and shift down) to combination meter.
Paddle shifter transmits signals (shift up and shift down) to combination meter. (With paddle shifter)
Combination meter transmits signals (manual mode, not manual mode, shift up and shift down) to TCM with CAN communication signal.
The secondary pressure sensor detects secondary pressure of CVT and sends a signal to the TCM.
Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolution speed as input signals, TCM changes the operating pressure of the primary pulley and the secondary pulley and changes the groove width of the pulley to control the gear ratio.
The primary pressure sensor detects primary pressure of CVT and sends a signal to the TCM.
The secondary pressure solenoid valve regulates the secondary pressure to suit the driving condition in response to a signal sent from the TCM.
When the power supply to the TCM is cut off, for example because the battery is removed, and the self-diagnosis memory function stops, a malfunction is detected.
Note. Since "P1701" is indicated when replacing TCM, perform diagnosis after erasing "Self Diagnostic Results".
The electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle position sensor, etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM via CAN communication.
The vehicle speed signal is transmitted from ABS actuator and electric unit (control unit) to TCM via CAN communication line.
The secondary speed sensor detects the revolution of parking gear and generates a pulse signal. The pulse signal is sent to the TCM, which converts it into vehicle speed.
The primary speed sensor detects the primary pulley revolution speed and sends a signal to the TCM.
The electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle position sensor, etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM via CAN communication.
- The lock-up select solenoid valve controls lock-up clutch pressure or forward clutch pressure (reverse brake pressure).
- When controlling lock-up clutch, the valve is turned OFF. When controlling forward clutch, it is turned ON.
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM.
The step motor changes the step by turning 4 coils ON/OFF according to the signal from TCM. As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled.
- The step motor changes the step by turning 4 coils ON/OFF according to the signal from TCM. As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled.
- This diagnosis item is detected when the electrical system is OK, but the mechanical system is NG.
- This diagnosis item is detected when the state of the changing of the speed mechanism in the unit does not operate normally.
- TCM sends position indicator signals to combination meter via CAN communication line.
- The selector lever position is indicated on the shift position indicator.
The selector lever cannot be shifted from "P" position to any other position unless the ignition switch is in the ON position and the brake pedal is depressed.