CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM > SYSTEM DESCRIPTION

for Preparation Click here



SYSTEM DESCRIPTION

  1. The Continuously Variable Transaxle (CVT) is an automatic transmission that electronically controls shift timing using the Transmission Control Module (ECM). The ECM detects electrical signals that indicate engine and driving conditions, and controls shift points based on driver habits and road conditions.
    In addition, the CVT has the following features:

    1. Diagnostic function
    2. Fail-safe function when a malfunction occurs


FUNCTION OF MAIN COMPONENTS

Component
Outline
Shift control solenoid DS1
The oil flow to primary pulley is controlled according to vehicle speed and accelerator opening.
Shift control solenoid DS2
The oil flow from primary pulley is controlled according to vehicle speed and accelerator opening.
Lock-up solenoid SL
The usage of belt clamping pressure liner solenoid SLS is switched.
Lock-up engagement solenoid DSU
The oil pressure for lock-up clutch engagement is controlled.
Belt clamping pressure liner solenoid SLS
Belt clamping pressure is controlled according to the input torque. Moreover, while forward and reverse clutch is engaged, or during neutral control, forward and reverse clutch oil pressure is controlled.
Transmission revolution sensor (NIN)
Primary pulley revolution speed is detected.
Transmission revolution sensor (NOUT)
Secondary pulley revolution speed is detected.
Transmission revolution sensor (NT)
Input turbine revolution speed is detected.
CVT oil temperature sensor
CVT fluid temperature is detected.
CVT oil pressure sensor
CVT oil pressure for belt clamping force is detected.
Engine coolant temperature sensor
Engine coolant temperature is detected.
Throttle position sensor
Opening of the throttle valve is detected.
Stop light switch
ON or OFF of the brake pedal is detected.
Park/neutral position switch
The position of the shift lever is detected.
ECM
The transmission is controlled based on the signal from each sensor. It has the diagnosis mode and the fail-safe function.
DLC3
DTCs and ECM data can be read by connecting the diagnosis tool.