Drive Mode Selector

Item	Signal	TCM function	Actuator
Input speed sensor 1, 2	Input speed	Drive mode selector	High and low reverse clutch solenoid valve Direct clutch solenoid valve Input clutch solenoid valve Low brake solenoid valve 2346 brake solenoid valve Front brake solenoid valve Torque converter clutch solenoid valve Line pressure solenoid valve Anti-interlock solenoid valve
Output speed sensor	Vehicle speed
A/T fluid temperature sensor	ATF temperature
ECM	Engine speed signal(1)
	Accelerator pedal position signal(1)
	Closed throttle position signal(1)
	Engine and A/T integrated control signal (engine torque)(1)
	Drive mode select signal(1)
	Shift schedule signal(1)
ABS actuator and electric unit (control unit)	Side G sensor signal(1)
BCM	Stop lamp switch signal(1)
A/C auto amp.	STANDARD mode signal(1)
	ECO mode signal(1)
	SPORT mode signal(1)
	SNOW mode signal(1)
(1) This signal is transmitted via CAN communication line.

• TCM receives STANDARD mode signal, ECO mode signal, SPORT mode signal, or SNOW mode signal from A/C auto amp. via CAN communication.
• TCM transmits recognized mode and gear shift line select result to ECM via CAN communication (by drive mode select signal and shift schedule signal).
• Drive mode may not actually be shifted because of CAN communication malfunction or other causes, although display on combination meter may indicate that shifting of drive mode is complete by operation of drive mode select switch.
• Priority is given to manual mode, when manual mode is selected by operation of selector lever or paddle shifter while driving in any other drive mode status.

ECO mode

• Driving characteristic is controlled (for decreasing needless acceleration and deceleration, reducing energy consumption, and fixing to ECO gear shift line), so that driving that improves operational fuel efficiency is assisted.
• For gear shift vehicle speed, refer to "VEHICLE SPEED AT WHICH GEAR SHIFTING OCCURS ".

SPORT mode

• This mode uses a shift schedule (gear shift line) that mainly utilizes the high engine speed zone and improves the driving control characteristic and response. This assists driving that is similar to driving a sports car.

ASC (Adaptive Shift Control)

• When driving on an up/down slope

  ASC judges up/down slope according to engine torque data transmitted from the ECM and vehicle speed. Fixing at 4GR, 5GR or 6GR on an up-slope prevents shift hunting and controls the vehicle to gain optimum driving force. On a down-slope, automatic shift-down to 4GR, 5GR or 6GR controls to gain optimum engine brake.

• When driving on a curve
  • In driving condition where acceleration, deceleration, or lateral acceleration continues, it corrects gear selection in order to keep a smooth vehicle speed during the curve and to give an adequate driving force at the curve end.
• When acceleration pedal is quickly released at curve entrance etc., it prevents an unnecessary shift-up.
• On braking operation at curve entrance, it gives an early shift-down according to the deceleration.
• In a sporty driving condition, it selects lower gear early even on a light braking operation, giving greater importance on driving force.

• TCM receives the side G sensor signal from the ABS actuator and electric unit (control unit). It locks to 4GR, 5GR or 6GR position in moderate cornering or to 3GR position in sharp cornering based on this signal. This prevents any upshift and kickdown during cornering, maintaining smooth vehicle travel.
  Fig 1: Adaptive Shift Control System Diagram

  Courtesy of NISSAN NORTH AMERICA, INC.

Fail-Safe

If a malfunction occurs in CAN communication between TCM and A/C auto amp., driving mode is maintained for approximately 30 seconds to the mode that is applied when the malfunction occurs. The mode then returns to STANDARD mode when accelerator pedal is released.