Nissan Versa

 Sedan Service Manual

Transmission & driveline » Transaxle & transmission (TM) » A/T control system
A/T control system : system description

SYSTEM DESCRIPTION

• The A/T senses vehicle operating conditions through various sensors or signals. It always controls the optimum shift position and reduces shifting and lock-up shocks.
• Receives input signals transmitted from various switches and sensors.
• Determines required line pressure, shifting point, lock-up operation, etc.
• Transmits required output signals to the respective solenoids.

INPUT/OUTPUT SIGNAL CHART

Sensor (or signal)		TCM function		Actuator
Engine speed signal Engine torque signal Accelerator pedal position signal Closed throttle position signal Stop lamp switch signal Transmission range switch O/D switch signal A/T fluid temperature sensor Input speed sensor Output speed sensor Vehicle speed signal		Line pressure control (TM) Shift change control (TM) Shift pattern control (TM) Lock-up control (TM) Fail-safe control (TM) Self-diagnosis (TM) CONSULT communication line (TM) CAN communication line (TM)		Line pressure solenoid valve Torque converter clutch solenoid valve Low clutch solenoid valve 2-4 brake solenoid valve High clutch/low & reverse brake solenoid valve Select switch ON-OFF solenoid valve Shift position indicator O/D OFF indicator lamp

INPUT/OUTPUT SIGNAL OF TCM

*: If these input and output signals are different, the TCM triggers the fail-safe function.

A/T control system : system description

A/T control system : fail-safe

A/T control system : protection control