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.
Combination Meter Assembly	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.
Airbag Sensor Assembly	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 ...

Other materials:

Toyota CH-R Service Manual > Occupant Classification System: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each sy ...

Toyota CH-R Service Manual > Continuously Variable Transaxle System: Acceleration Sensor Circuit (P1585)
DESCRIPTION The ECM determines the vehicle inclination based on a signal from the airbag sensor assembly (yaw rate and acceleration sensor). If a malfunction in the airbag sensor assembly (yaw rate and acceleration sensor) is determined based on a malfunction signal from the skid control ECU ...

Toyota CH-R Service Manual: System Description

How To Proceed With Troubleshooting

Check For Intermittent Problems

Other materials:

Toyota C-HR (AX20) 2023-2025 Owner's Manual

Toyota CH-R Owners Manual

Toyota CH-R Service Manual