Fail-Safe Function/Backup Function

If abnormality occurs in signals from various sensors, switches, or solenoids, this function allows controlling them with the minimum adverse effect to the driving performance. The following shows the fail-safe controls when an abnormal signal is input to TCM from each sensor.

Malfunctioning Item	Control Default During Malfunction
Secondary pulley speed sensor	Performs the shift control depending on the accelerator angle. Also, prohibits the sport mode and controls as the D range.
Primary pulley speed sensor	Performs the shift control depending on the accelerator angle and secondary pulley rotation (vehicle speed). Also, prohibits the sport mode and controls as the D range.
Transmission range switch	Controls as the D range.
Transmission fluid temperature sensor	Controls using the fixed value for the fail-safe function.
Secondary pressure sensor	Stops the secondary pressure feedback control and controls the line pressure using the fixed value for the fail-safe function. Also, suppresses the engine torque.
Line pressure solenoid valve	Switches the line pressure solenoid valve OFF to achieve the maximum line pressure.
Secondary pressure solenoid valve	Switches the secondary pressure solenoid valve OFF to achieve the maximum secondary pressure.
Lock-up solenoid valve	Switches the lock-up solenoid valve OFF to release lock-up.
Stepper motor	Switches all the coils A to D of the stepper motor OFF to retain the gear ratio just before the abnormality occurs.
Lock-up/select switching solenoid valve	Switches the lock-up/select switching solenoid valve OFF to release lock-up.
Back-up power supply	If the control memory back-up power supply from the battery is not supplied to TCM, limits the engine torque to protect the transaxle main body. After the normal power is supplied, turning the key switch from "LOCK" (OFF) to "ON" once resumes the normal status.
Paddle shift switch < Vehicles with paddle shift >	Prohibits the paddle shift operation.