Acura NSX 1997 Service Manual page 368

Main Menu
Description
Electronic Control System (cont'd)
• Automatic shifting control in Sport Shifting mode
This position also has automatic shifting areas:
• 1-2 upshift
• 4-3 downshift, 3-1 downshift, 2-1 downshift
depending on vehicle speed. To prevent engine over-revving, the transmission has a 1-2 automatic upshift speed, and 4-3,
3-1, 2-1 downshift allowable speeds.
• When the vehicle reaches the 1-2 automatic upshift speed, the TCM outputs the 1-2 upshift signal to the transmis-
sion and the transmission upshifts to 2nd from 1st gear.
• When the vehicle is coasting over the 4-3 downshift allowable speed and 3-2 downshift allowable speed, the TCM
does not input the downshift signal from the shift switch, and the transmission does not downshift.
• When the vehicle is coasting over the 2-1 downshift allowable speed in 2nd gear, the TCM inputs the signal to wait
until it reaches the 2-1 downshift allowable speed, then the shift indicator blinks to indicate it is waiting to downshift
to 1st.
When the vehicle decelerates to a stop, the transmission shifts to 1st gear automatically.
The transmission can be shifted to 2nd gear by pushing the shift switch up while the vehicle is stopped. This allows the
vehicle to start off in 2nd gear.
Lock-up Control
From sensor input signals, the TCM determines whether to turn the lock-up ON or OFF, and activates lock-up control
solenoid valve A and/or B accordingly.
The lock-up control mechanism comes into operation in 2nd, 3rd, and 4th, in
The combination of driving signals to lock-up control solenoid valves A and B is shown in the table below.
Table of Contents
positions.