Toyota
Nissan Versa
 Sedan Service Manual
Transmission & driveline » Transaxle & transmission (TM) » A/T control system
A/T control system : protection control

The TCM becomes the protection control status temporarily to protect the safety when the safety of TCM and transmission is lost. It automatically returns to the normal status if the safety is secured.

The TCM is equipped with the following protection control.

REVERSE INHIBIT CONTROL

Intercepts the torque transmission and shifts to the neutral status if the selector lever is shifted to "R" position while the vehicle moves forward at the vehicle speed 10 km/h (7 MPH) or more.

Operation detection conditions
  • Vehicle speed: 10 km/h (7 MPH) or more (when driving forward)
  • Selector lever is shifted to "R" position.
Control when activated Neutral
Recovery condition
  • Vehicle speed: 7 km/h (4 MPH) or less and
  • Engine speed: 2,800 rpm or less
Vehicle behavior
  • The torque transmission cannot be performed
  • There is a shock just before a vehicle stop

TCM HIGH TEMPERATURE PROTECTION CONTROL

When the ATF becomes hot, the shifting pattern is changed for preventing fluid temperature rise.

Operation detection conditions ATF temp.: 125C (257F) or more
Control when activated Change the shift pattern so that higher upshift may be achieved.
Recovery condition
  • ATF temp.: 119C (246F) or less
Vehicle behavior Upshifts at a higher vehicle speed than usual.

TORQUE-DOWN CONTROL WHEN CONTINUOUS STALL OCCURS IN D POSITION

If the accelerator pedal is continually depressed for a certain length of time when the selector lever is in the "D" position and the vehicle is parked, the engine output is limited for protecting the transaxle.

Operation detection conditions The following conditions continue for 20 seconds or more
  • Selector lever is in the "D" position or "R" position and the vehicle is stopped and
  • Engine speed: 2,300 - 2,850 rpm
Control when activated Limits engine output
Recovery condition
  • Selector lever is shifted to a position other than "D" or "R" or
  • The accelerator pedal is released
Vehicle behavior
  • Decreased starting performance
  • Engine speed hunching when the accelerator pedal is depressed

O/D PROHIBIT CONTROL AT LOW TEMPERATURES

When the ATF temperature is low immediately after engine start, shifting to 4GR is prohibited for protecting the transaxle and allowing the exhaust gas characteristics to warm up quickly.

Operation detection conditions
  • ATF temp.: 0C (32F) or less or
  • ATF temp.: less than 40C (104F) (when IGN is ON)
  • Vehicle speed: 65 km/h (40 MPH) or less
  • 3GR
Control when activated 4GR prohibited
Recovery condition Less than 130 seconds following IGN ON
  • ATF temp.: 40C (104F) or more or
  • Vehicle speed: 65 km/h (40 MPH) or higher After 130 seconds following IGN ON
  • ATF temp.: 0C (32F) or more
Vehicle behavior Shifts up only as far as 3GR.
    More about «A/T control system»:

    A/T control system : system description

    A/T control system : fail-safe

    A/T control system : protection control

    Nissan Versa Sedan Service Manual / Transmission & driveline / Transaxle & transmission (TM) / A/T control system / A/T control system : protection control

    Nissan Versa Sedan Service Manual

    Categories


    © 2017-2024 Copyright www.niveguide.com