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In E
position in 2nd, 3rd and 4th, and E
position in 3rd, pressurized fluid is drained from rhe back of the torque con-
verter 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 crankshatt. Together with hydraulic control, the TCM op-
timized 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 according to lock-up control solenoid valves A and B, and the throttle
valve B. 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 torque converter housing. and are controlled by the TCM.
LOCK,UP CONTROL
LOCT.UP SHIfT VALVE
AlF COOIER
tocK uP coNTno! valvE
\
S o l e n o i d v a l v e
L*r""r "o.Jtio"
\
B
Lock'up OFF
O F F
O F F
L o c k - u p , s l i g h t
O N
O F F
Lock-up, half
O N
ON
Lock-up, full
ON
O N
LOCK-Up
du.ing deceleration
O N
Duty operation
OFF - ON
IOCK UP TIMING B VATVE
( c o n t ' d )
14-39
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Table of Contents
Troubleshooting
