Honda Civic Service Manual page 693

Description
Electronic Control System (cont'd)
Shift Control
The PCM instantaneously determines which gear should be selected by various signals sent from sensors, and actuates
the shift control solenoid valves A and B to control shifting. Also. a Grade Logic Control System has been adopted to con-
trol shifting in E position while the vehicle is ascending or descending a slope, or reducing speed.
Poshion
Gear
Shift Control Solenoid
Vslve A
Shift Control Solenoid
Valve B
8,tr
1st
OFF
ON
2 n d
O N ON
3rd
O N
O F F
E
4th
OFF
OFF
tr
2nd ON
ON
E-
Reverse
O N
OFF
*See page 14-31 for reverse inhibitor control description.
Lock-up Control
From sensor input signals, the PCM determines whether to turn the lock-up ON or OFF, and activates lock-up control
solenoid valve A and/or B accordingly. The combination of driving signals to lock-up control solenoid valves A and B and
the linear solenoid pressure is shown in the table below.
Lock-up Conditions
Lock-up Control
Solenoid Valvo A
Lock-up Control
Solenoid Valve B
Linoar Solonoid
Prggguro
Lock-up OFF
OFF
OFF
H i g h
Lock-up, Half ON
Duty operation
OFF * ON
Low
Lock-up, Full ON ON
High
L O C K - U p
during deceleration
O N
Duty operation
OFF - ON
a
14-14