System Description

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

CVT detects the vehicle driving status from switches, sensors and signals and controls the vehicle so that the optimum shift position and shift timing may always be achieved. It also controls the vehicle to reduce shift and lockup shock, etc.
Receives input signals from switches and sensors.
Sends the output signal necessary for operation of solenoid valves and evaluates the line pressure, shift timing lockup operation, engine brake performance, etc.
If a malfunction occurs on the electric system, activate the fail-safe mode only to drive the vehicle.

Input/Output Signal of TCM

Control Item		Shift Control	Line Pressure Control	Select Control	Lock-up Control	Fail-Safe Function*
Input	Engine Torque Signal (CAN Communication)	X	X	X	X	X
	Engine Speed Signal (CAN Communication)	X	X	X	X	X
	Accelerator Pedal Position Signal (CAN Communication)	X	X	X	X	X
	Throttle Position Signal (CAN Communication)	X	X	-	X	X
	Brake Pedal Position Signal (CAN Communication)	X	X	X	X	-
	Secondary Pressure Sensor	X	X	X	-	X
	CVT Fluid Temperature sensor	X	X	X	X	X
	Primary Speed Sensor	X	X	X	X	X
	Secondary Speed Sensor	X	X	X	X	X
	Output Speed Sensor	X	X	X	X	X
	Transmission Range Switch	X	X	X	X	X
Output	Line Pressure Solenoid valve	X	X	X	-	X
	Primary Pressure Solenoid valve	X	X	-	-	X
	Torque Converter Clutch Solenoid Valve	-	-	-	X	X
	High Clutch and Reverse Brake Solenoid Valve	X	-	X	-	X
	Low Brake Solenoid Valve	X	-	X	-	X
	Shift Position Indicator (CAN Communication)	-	-	X	-	-
* If these input/output signals show errors, TCM activates the fail-safe function.

For Idling Stop Applied Model Only

Control Item		Idling Stop Control	Fail-Safe Function*
Input	Electric Oil Pump Input (STATE)	X	X
Output	Electric Oil Pump Relay	X	-
Output	Electric Oil Pump Output (SIG)	X	-
* If these input/output signals show errors, TCM activates the fail-safe function.