A/T CONTROL DIAGRAM
AT-5spec tableA/T (automatic transmission) specific page. D range will not shift to 4th when overdrive switch is in OFF position (*4). Overrun clutch operates in 1st gear D range only when overdrive switch is OFF (*1).
Electrical Control Chart
Component LocationFig. fig1
Block diagram of A/T electrical control system
SAT817B
1Vehicle signal(top-left)
2Speed sensor(left)
3Overdrive switch(left)
4Kickdown switch(left)
5Power supply(left)
6Engine(top-center)
7A/T(center)
8Vehicle signal(top-right)
9Overdrive off indicator lamp(right)
10Control signal(center-right)
11Idle switch(center-left)
12Full-throttle switch(center-left)
13Throttle sensor(center-left)
14Engine rpm signal(center-left)
15Inhibitor switch(center)
16Fluid temperature sensor(center)
17Revolution sensor(center)
18Shift solenoid A(center-right)
19Shift solenoid B(center-right)
20Overrun clutch solenoid(center-right)
21Lock-up solenoid(center-right)
22Line pressure solenoid(right)
23Dropping resistor(right)
24A/T control unit(bottom-center)
25Electrical signal (arrow)(top-right legend)
26Hydraulic pressure (arrow)(top-right legend)
Mechnical Operation
Mechanical Operation
P
Gear
Reverse clutch
High clutch
Forward clutch
Overrun clutch
Band servo 2nd apply
Band servo 3rd release
Band servo 4th apply
Forward one-way clutch
Low one-way clutch
Low & reverse brake
Lock-up
RemarksPARK
R
Gear
Reverse clutchO
High clutch
Forward clutch
Overrun clutch
Band servo 2nd apply
Band servo 3rd release
Band servo 4th apply
Forward one-way clutch
Low one-way clutch
Low & reverse brakeO
Lock-up
RemarksREVERSE
N
Gear
Reverse clutch
High clutch
Forward clutch
Overrun clutch
Band servo 2nd apply
Band servo 3rd release
Band servo 4th apply
Forward one-way clutch
Low one-way clutch
Low & reverse brake
Lock-up
RemarksNEUTRAL
D *4
Gear1st
Reverse clutch
High clutch
Forward clutchO
Overrun clutch*1 (filled circle small)
Band servo 2nd apply
Band servo 3rd release
Band servo 4th apply
Forward one-way clutch●
Low one-way clutch●
Low & reverse brake
Lock-up
RemarksAutomatic shift 1→2→3→4
D *4
Gear2nd
Reverse clutch
High clutch
Forward clutchO
Overrun clutch*1 O (filled)
Band servo 2nd applyO
Band servo 3rd release
Band servo 4th apply
Forward one-way clutch●
Low one-way clutch
Low & reverse brake
Lock-up
RemarksAutomatic shift 1→2→3→4
D *4
Gear3rd
Reverse clutch
High clutchO
Forward clutchO
Overrun clutch*1 O (filled)
Band servo 2nd apply*2 ⊗
Band servo 3rd release⊗
Band servo 4th apply
Forward one-way clutch●
Low one-way clutch
Low & reverse brake
Lock-up
RemarksAutomatic shift 1→2→3→4
D *4
Gear4th
Reverse clutch
High clutchO
Forward clutch⊗
Overrun clutch
Band servo 2nd apply*3 ⊗
Band servo 3rd release⊗
Band servo 4th applyO
Forward one-way clutch
Low one-way clutch
Low & reverse brake
Lock-upO
RemarksAutomatic shift 1→2→3→4
2
Gear1st
Reverse clutch
High clutch
Forward clutchO
Overrun clutch⊗
Band servo 2nd apply
Band servo 3rd release
Band servo 4th apply
Forward one-way clutch●
Low one-way clutch●
Low & reverse brake
Lock-up
RemarksAutomatic shift 1→2
2
Gear2nd
Reverse clutch
High clutch
Forward clutchO
Overrun clutchO (filled)
Band servo 2nd applyO
Band servo 3rd release
Band servo 4th apply
Forward one-way clutch●
Low one-way clutch
Low & reverse brake
Lock-up
RemarksAutomatic shift 1→2
1
Gear1st
Reverse clutch
High clutch
Forward clutchO
Overrun clutchO
Band servo 2nd apply
Band servo 3rd release
Band servo 4th apply
Forward one-way clutch●
Low one-way clutch
Low & reverse brakeO
Lock-up
RemarksLocks (held stationary) in 1st speed 1→2
1
Gear2nd
Reverse clutch
High clutch
Forward clutchO
Overrun clutchO
Band servo 2nd applyO
Band servo 3rd release
Band servo 4th apply
Forward one-way clutch●
Low one-way clutch
Low & reverse brake
Lock-up
RemarksLocks (held stationary) in 1st speed 1→2
NOTE
*1. Operates when overdrive switch is set in "OFF" position.
*2. Oil pressure is applied to both 2nd "apply" side and 3rd "release" side of band servo piston. However, because oil pressure area on the "release" side is greater than that on the "apply" side, brake band does not contract.
*3. Oil pressure is applied to 4th "apply" side in condition *2 above, and brake band contracts.
*4. A/T will not shift to 4th when overdrive switch is set in "OFF" position.
O : Operates.
○ (filled small) : Operates when throttle opening is less than 1/16. Engine brake activates.
● : Operates during "progressive" acceleration.
⊗ : Operates but does not affect power transmission.
⊙ : Operates when throttle opening is less than 1/16 but does not affect engine brake.