Toyota CH-R Service Manual: System Description

Toyota CH-R Service Manual / K114 Cvt / Continuously Variable Transaxle System / System Description

SYSTEM DESCRIPTION

SYSTEM DESCRIPTION

(a) The K114 (CVT) is a fully electrohydraulically controlled steel belt type continuously variable transaxle. This is a highly efficient transaxle that is controlled in conjunction with the engine, contributing to enhanced fuel efficiency and quietness without shift shock. In addition, the continuously variable transaxle has the following features:

  • Diagnostic function
  • Fail-safe function when a malfunction occurs

FUNCTION OF MAIN COMPONENTS

(a) The main components of the K114 CVT system are as follows:

Component

Outline

Continuously Variable Transaxle Assembly

Shift Solenoid Valve SC

Used to switch control of the shift solenoid valve SLU between forward and reverse clutch control and lock-up clutch control.

Shift Solenoid Valve SL

Shift Solenoid Valve SLU

Performs forward and reverse clutch control or lock-up clutch control depending on the state of the shift solenoid valves SC and SL.

Shift Solenoid Valve SLP

Controls the oil pressure of the primary pulley.

Shift Solenoid Valve SLS

Controls the oil pressure of the secondary pulley.

Transmission Revolution Sensor (NIN)

Detects the primary pulley speed.

Transmission Revolution Sensor (NOUT)

Detects the secondary pulley speed.

Transmission Revolution Sensor (NT)

Detects the input turbine speed.

CVT Fluid Temperature Sensor

Detects the CVT fluid temperature.

Oil Pressure Sensor

Detects the CVT oil pressure for belt clamping force.

Stop Light Switch Assembly

Detects the state of the brake pedal.

Park/Neutral Position Switch

Detects the position of the shift lever.

Shift Lock Control Unit Assembly

Transmission Control Switch
  • Detects that the shift lever is in M.
  • Detects the driver's shift-up and shift-down operations when the shift lever is in M.

Combination Meter Assembly

Shift Position Indicator

Indicates the shift lever position.

Malfunction Indicator Lamp (MIL)

Illuminates or blinks to alert the driver that the ECM has detected a malfunction.

ECM
  • Performs electronic control of the CVT system.
  • When the ECM detects a malfunction, the ECM performs diagnosis and memorizes the malfunctioning area.

Airbag Sensor Assembly

Yaw Rate Sensor

Detects the vehicle's yaw rate.

Acceleration Sensor

Detects the vehicle's longitudinal and lateral acceleration and deceleration.

Brake Actuator Assembly

Skid Control ECU
  • Transmits the vehicle speed and longitudinal acceleration signals to the ECM.
  • Transmits the operating states of the ABS and VSC to the ECM.

DLC3

Used for connecting the Techstream to read diagnostic trouble codes and ECM data.

HINT:

The airbag sensor assembly incorporates the yaw rate sensor and acceleration sensor.

    How To Proceed With Troubleshooting
    CAUTION / NOTICE / HINT HINT: The ECM of this system is connected to the CAN communication system. Therefore, before starting troubleshooting, be sure to check that there are no malf ...

    Check For Intermittent Problems
    CHECK FOR INTERMITTENT PROBLEMS HINT: Inspect the ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 ...

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    DESCRIPTION When the CAN bus main lines are normal (no open, short to ground, short to +B or short between lines) and there is an ECU or sensor on the "Communication Bus Check" screen that is indicated as not communicating or whose connection status on the "Communication Bus Ch ...

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