Honda CR-V 1997 Service Manual page 555

Lock-up System
TOROUE CONVERTER
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LOCK-UP CONTROL
~ VALVE
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LOCK-UP CONTROL
SOLENOID VALVE
A B
" RELIEF VALVE
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LOCK-UP TlMING
VALVE
"
VALVE
Pl\£SSURE
In
Il!il
position ('97 - 98 models) and in
lID
position 1'99-
00 models) 13rd and 4thl, and
Illil
position ('97 - 98 mod-
elsl and in
lID
position with Over-Orive 10/01 is OFF (by
pressing the 0 10 switchl ('99 - 00 modelsl (3rdl, pressur-
ized fluid is drained from the back of the torque convert-
er through a fluid passage, causing the lock-up piston to
be held against the torque converter cover. As this takes
place, the mainshaft rotates at the same speed as the
engine crankshaft. Together with the hydraulic control,
the PCM optimizes the timing of the lock-up system_
Under certain conditions, the lock-up clutch is applied
during deceleration, in 3rd and 4th gear.
The lock-up system controls the range of lock-up accord-
ing to lock-up control solenoid valves A and 8 , and the
linear solenoid. When lock-up control solenoid valves A
and B activate, modulator pressure changes. Lock-up
control solenoid valves A and B are mounted on the out-
side of the torque converter housing. and the linear
solenoid is mounted on the transmission housing. They
are controlled by the PCM .
The table below shows the lock-up conditions for lock-up
control solenoid valves and linear solenoid pressure.
Lock-up Control
Unear
Lock-up
Solenoid Valve
Solenoid
Conditions
A
B
Pressure
Lock-up OFF OFF OFF High
Lock-up, Half
ON
Duty operation
Low
OFF - ON
Lock-up, Full
ON ON High
Lock-up
Duty operation
during
ON Low
deceleration
OFF - ON
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LINEAR SOLENOID PRESSURE
COOLER RELIEF VALVE
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ATF STRAINER
Icont'dl
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